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1.
《Ceramics International》2021,47(18):25680-25688
LiNi0.8Co0.1Mn0.1O2 cathode material for lithium-ion battery exhibits high capacity, but it suffers from interfacial side reactions and structural/thermodynamic instability, which leads to capacity reduction and safety problems. Cubic brick (Ni0.8Co0.1Mn0.1)C2O4·2H2O particles with micron size are synthesized by co-precipitation method. The oxalic precursor is sintered with lithium hydroxide to obtain cubic mono-dispersion LiNi0.8Co0.1Mn0.1O2 micrometer particles. Structural stability, cycling performance, rate capability and compacting density of the cubic mono-dispersion material are investigated. Conventional spherical and irregular mono-dispersion LiNi0.8Co0.1Mn0.1O2 are also prepared for comparison. The results reveal that the cubic mono-dispersion LiNi0.8Co0.1Mn0.1O2 dramatically enhances the structural stability and cycling performance at a little cost of capacity and rate capability. 相似文献
2.
WO3 membrane-encapsulated layered LiNi0.6Co0.2Mn0.2O2 cathode material for advanced Li-ion batteries
Guowen Song Hui Zhong Yanyang Dai Xiangyang Zhou Juan Yang 《Ceramics International》2019,45(6):6774-6781
Despite Nickel-rich materials have all the advantages of high capacity, long cycle life and low cost, there is still a disadvantage that the capacity decreases rapidly as the number of cycles increases. In order to solve this problem, WO3 was uniformly coated on the surface of LiNi0.6Co0.2Mn0.2O2 cathode materials by wet coating, and its cycling performance was greatly improved with the higher capacity. The coated materials were analyzed by X-ray diffraction(XRD), Scanning electron microscope (SEM), high resolution Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy(XPS). The results showed that the coating thickness was around 3.15?nm, and some tungsten ions were doped into the lattice of the near surface area of the LiNi0.6Co0.2Mn0.2O2 material. In addition, the results of charge-discharge test showed that 1?wt%WO3 coating LiNi0.6Co0.2Mn0.2O2 had the best performance, and delivered a discharge capacity of 140 mAh g?1 (the capacity retention rate is 84.8%) in the potential interval of 2.8–4.3?V at 1?C (1?C?=?165?mA?g?1) after 200 cycles, while the bare cathode material only delivered a discharge capacity of 120 mAhg?1 (the capacity retention rate is 75%). The phenomenon indicates that the WO3 coating plays a role in inhibiting the harmful side reactions between the cathode material and the electrolyte, improving the electrochemical and structure stability of LiNi0.6Co0.2Mn0.2O2 cathode materials. 相似文献
3.
Ling-jun Li Zhi-xing Wang Hua-jun Guo Peng Yue Wei Chen Ling Wu 《Powder Technology》2011,206(3):353-357
Nanocrystalline materials of Ni0.8Co0.1Mn0.1(OH)2 are successfully synthesized by fast co-precipitation method. The crystalline structure and morphology of the precursors and LiNi0.8Co0.1Mn0.1O2 materials are characterized by XRD, SEM and Rietveld refinement analyses. It is found that the nanocrystalline phase and low crystallinity of Ni0.8Co0.1Mn0.1(OH)2 could help achieve its uniform mixing with lithium source, and further attribute to highly ordered layered LiNi0.8Co0.1Mn0.1O2 with low cation mixing degree. Electrochemical studies confirm that the LiNi0.8Co0.1Mn0.1O2 exhibits a good electrochemical property with initial discharge specific capacity of 192.4 mAh g− 1 at a current density of 18 mA g− 1, and the capacity retention after 40 cycles is 91.56%. This method is a simple and effective method to synthesize cathode material. 相似文献
4.
Tae Eun Hong E. D. Jeong S. R. Baek M. R. Byeon Young-Suck Lee F. Nawaz Khan Ho-Soon Yang 《Journal of Applied Electrochemistry》2012,42(1):41-46
The LiNi1/3Co1/3Mn1/3O2 powders required for the present study, obtained by coprecipitation method has been surface coated with boron and aluminum.
The morphology and crystal structure of powders have been characterized using scanning electron microscopy, X-ray diffraction
and X-ray photoelectron spectroscopy techniques. The elemental distribution of the coated samples analyzed by transmission
electron microscopy images and nano secondary ion mass spectrometry indicates a thin uniform layer of [B, Al]2O3 on the surface of spherical LiNi1/3Co1/3Mn1/3O2. The surface-modified LiNi1/3Co1/3Mn1/3O2 has been explored as a cathode material for lithium secondary ion battery applications. The electrochemical charge–discharge
results reveal that the capacity retention rate of coated LiNi1/3Co1/3Mn1/3O2 after 40 cycles at 1 C rate maintains 93% of the initial discharge capacity while the rate of bare LiNi1/3Co1/3Mn1/3O2 maintains only 88%. It is noticed that the small amounts of boron and aluminum coatings on the surface of LiNi1/3Co1/3Mn1/3O2 can significantly improve the electrochemical properties of electrode materials because of the suppression of reaction between
the cathode and the electrolytes. 相似文献
5.
Nickel-rich layered materials are prospective cathode materials for use in lithium-ion batteries due to their higher capacity and lower cost relative to LiCoO2. In this work, spherical Ni0.8Co0.1Mn0.1(OH)2 precursors are successfully synthesized through a co-precipitation method. The synthetic conditions of the precursors - including the pH, stirring speed, molar ratio of NH4OH to transition metals and reaction temperature - are investigated in detail, and their variations have significant effects on the morphology, microstructure and tap-density of the prepared Ni0.8Co0.1Mn0.1 (OH)2 precursors. LiNi0.8Co0.1Mn0.1O2 is then prepared from these precursors through a reaction with 5% excess LiOH· H2O at various temperatures. The crystal structure, morphology and electrochemical properties of the Ni0.8Co0.1Mn0.1 (OH)2 precursors and LiNi0.8Co0.1Mn0.1O2 were investigated. In the voltage range from 3.0 to 4.3 V, LiNi0.8Co0.1Mn0.1O2 exhibits an initial discharge capacity of 193.0mAh g-1 at a 0.1 C-rate. The cathode delivers an initial capacity of 170.4 mAh g-1 at a 1 C-rate, and it retains 90.4% of its capacity after 100 cycles. 相似文献
6.
Shengde Dong Yuan Zhou Chunxi Hai Jinbo Zeng Yanxia Sun Yue Shen Xiang Li Xiufeng Ren Guicai Qi Xinxing Zhang Luxiang Ma 《Ceramics International》2019,45(1):144-152
In this study, we have successfully coated the CeO2 nanoparticles (CeONPs) layer onto the surface of the Ni-rich layered LiNi0.7Co0.2Mn0.1O2 cathode materials by a wet chemical method, which can effectively improve the structural stability of electrode. The X-ray powder diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS) are used to determine the structure, morphology, elemental composition and electronic state of pristine and surface modified LiNi0.7Co0.2Mn0.1O2. The electrochemical testing indicates that the 0.3?mol% CeO2-coated LiNi0.7Co0.2Mn0.1O2 demonstrates excellent cycling capability and rate performance, the discharge specific capacity is 161.7?mA?h?g?1 with the capacity retention of 86.42% after 100 cycles at a current rate of 0.5?C, compared to 135.7?mA?h?g?1 and 70.64% for bare LiNi0.7Co0.2Mn0.1O2, respectively. Even at 5?C, the discharge specific capacity is still up to 137.1?mA?h?g?1 with the capacity retention of 69.0%, while the NCM only delivers 95.5?mA?h?g?1 with the capacity retention of 46.6%. The outstanding electrochemical performance is assigned to the excellent oxidation capacity of CeO2 which can oxidize Ni2+ to Ni3+ and Mn3+ to Mn4+ with the result that suppress the occurrence of Li+/Ni2+ mixing and phase transmission. Furthermore, CeO2 coating layer can protect the structure to avoid the occurrence of side reaction. The CeO2-coated composite with enhanced structural stability, cycling capability and rate performance is a promising cathode material candidate for lithium-ion battery. 相似文献
7.
Jiawei Li Jingjing Wang Xianghao Lu Hongyu Jiang Quanhai Zhang Bin Wang Chunyan Lai 《Ceramics International》2021,47(5):6341-6351
It is still a huge challenge to improve the safety and stability of Ni-rich (LiNi0.8Co0.1Mn0.1O2) cathode materials at elevated potential. Herein, the PrF3 layer is employed to protect LiNi0.8Co0.1Mn0.1O2 (NCM811) via a simple wet chemical process. It was confirmed by XRD, HR-SEM, TEM, EDS, and XPS tests that PrF3 is evenly covered throughout the surface of NCM811 without affecting the particle size and surface morphology. In particular, 1 wt% PrF3 coated NCM811 exhibits excellent stability and rate capability with the capacity retention of 86.3% after 100 cycles at 1 C under a cut-off potential of 4.3 V, while the retention of pristine one is only 73.8%. Moreover, the capacity retention of 1 wt% PrF3 coated samples enhances from 74.5% to 88.5% after 50 cycles at 1 C under higher cut-off voltage of 4.6 V. The superior performance for coated samples can be attributed to the fact that PrF3 can effectively isolate the active material and the electrolyte from HF corrosion, and at the same time, reduce the generation of micro-cracks on the surface during prolonged cycles. Furthermore, as a physical barrier, PrF3 alleviates the dissolution of transition metals in the electrolyte largely. These results suggest that the stability of NCM811 can be greatly upgraded at high voltage by PrF3 coating. 相似文献
8.
Highly improved structural stability and electrochemical properties of Ni-rich NCM cathode materials
《Ceramics International》2023,49(8):12138-12143
We report a simple, easy way using WO3 to build a conductive protective coating layer on the surface of LiNi0.8Co0.1Mn0.1O2 cathode. The WO3 coating layer can block direct contact between the LiNi0.8Co0.1Mn0.1O2 and electrolyte, resulting in suppress the transition metal dissolution and interfacial unwanted reaction on the particle surface. Moreover, WO3 coating layer allows for the smooth and rapid lithium and electron kinetics. The WO3 coating improves the electrochemical performance, especially, this way significantly enhances the rate capability of 166.2 mAh g−1 at 6.0C and cyclability of 85.8% after 100 cycles. Therefore, WO3 coating provides a new breakthrough to improve the structural stability and suppress the resistance for superior electrochemical performances of lithium ion batteries. 相似文献
9.
Fangjun Zhu You Shi Guorong Hu Zhongdong Peng Yanbing Cao Qian Sun Zhichen Xue Yinjia Zhang Ke Du 《Ceramics International》2021,47(3):3070-3078
Titanium and boron are simultaneously introduced into LiNi0.8Co0.1Mn0.1O2 to improve the structural stability and electrochemical performance of the material. X-ray diffraction studies reveal that Ti4+ ion replaces Li+ ion and reduces the cation mixing; B3+ ion enters the tetrahedron of the transition metal layers and enlarges the distance of the [LiO6] layers. The co-doped sample has spherical secondary particles with elongated and enlarged primary particles, in which Ti and B elements distribute uniformly. Electrochemical studies reveal the co-doped sample has improved rate performance (183.1 mAh·g-1 at 1 C and 155.5 mAh·g-1 at 10 C) and cycle stability (capacity retention of 94.7% after 100 cycles at 1 C). EIS and CV disclose that Ti and B co-doping reduces charge transfer impedance and suppresses phase change of LiNi0.8Co0.1Mn0.1O2. 相似文献
10.
《Ceramics International》2019,45(15):18965-18971
Different calcination atmospheres of air, 50% oxygen (vs. N2) and pure oxygen have been used to prepare special LiNi0.8Co0.1Mn0.1O2 cathode materials to observe the influence of oxygen composition. To investigate the structure and electrochemical property of the samples using different oxygen compositions, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), cycling performance tests and electrochemical impedance spectroscopy (EIS) were carried out. XRD, SEM, and XPS results show that the sample made using higher oxygen composition has less cation mixing and lower levels of Ni2+. However, both samples have almost the same oxygen environments on their surfaces as well as micro-morphology and size. The sample with a higher oxygen composition shows better electrochemical performance. Interestingly, the electrochemical performance of the sample made using 50% oxygen is similar to that made with pure oxygen and much better than the sample made with air. It has a specific capacity of 202.4 mAh g−1 at 0.1C and a capacity retention of 85.2% after 300 cycles at 1C, which may be meaningful for balancing cost and performance. 相似文献
11.
《Ceramics International》2020,46(4):4643-4651
Particle size plays an important role in the electrochemical properties of cathode materials for lithium-ion battery, and the sizes of cathode powders are often designed to specific scales to obtain desired rate capacity, cyclic stability, etc. Nano-sized or micron-sized primary/secondary particles were both reported to be helpful to heighten the electrochemical properties of the same material system. However, the relationship between particle size and electrochemical properties of Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM-811) has not been discussed in detail. Here, we prepared the pristine NCM-811 powders with various micro-sized particles by using solid state reaction, and investigated the influence of particle size on the electrochemical properties of typical NCM-811 cathode material, to clarify the importance of size effect. The result indicates that pristine NCM-811 cathode powders with D50 = 7.7 μm displayed the best initial discharge specific capacity (224.5 and 169.1 mA h/g at 1/20 C and 1 C rate, respectively) and retention capacity (71.0% at 1 C rate) after 100th cycling at room temperature. The mutual acting mechanism in terms of layered structure, cation mixing degree, polarization state, charge-transfer resistance, and the diffusion ability of lithium-ion was confirmed by XRD, XPS, CV and EIS analyses, respectively. 相似文献
12.
《Ceramics International》2020,46(14):21888-21901
LiNi0.8Co0.1Mn0.1O2 (NCM811) is a typical nickel (Ni)-rich ternary cathode material with several advantages, such as high specific capacity, low-cost, and environmentally friendly, making it a good candidate for use in lithium-ion batteries. However, its Ni content is as high as 80%; therefore, several new problems have emerged with gradually increasing applications. In this review, Li–Ni disorder and corresponding modification methods are first briefly reviewed, and then the origin of complex surface defect, which has a crippling effect on diffusion processes of Li+ at electrolyte/cathode interface, is discussed in detail. Analyses showed the importance of selecting appropriate surface modification material/technique for enhancing electrochemical properties. Therefore, popular surface coating materials and methods including metal oxides, fluorides, phosphates, fast ion conductors, and other compounds/elements used for the development of NCM811 are subjected to extensive and thorough research. Finally, several new perspectives and insights related to stability and safety at high voltages and temperatures, and the optimization of production process are also proposed. 相似文献
13.
《Ceramics International》2020,46(14):22606-22618
This study aimed to prepare a composite coating material comprising a solid ionic conductor of lithium aluminum titanium phosphate (Li1.4Al0.4Ti1.6(PO4)3, LATP) and porous carbon through a sol-gel method. LiNi0.8Co0.1Mn0.1O2 (LNCM811) cathode material with dual-functional composite conductors (i.e., LATP@porous carbon), denoted as LATP-PC, was prepared. The dry-coating method, also called the “mechanical-fusion alloy route,” was used to modify Ni-rich LNCM811 cathode materials. X-ray diffraction (XRD), micro-Raman spectroscopy, and X-ray photoelectron spectroscopy confirmed that the LATP ionic conductor generated herein was uniformly deposited on 3D porous carbon and served as a dual-functional composite coating on LNCM811. Furthermore, the capacity retention of LATP-PC@LNCM811 was approximately 85.57% and 80.86% after 100 cycles at −20 °C and 25 °C, respectively. By contrast, pristine LNCM811 had the capacity retention of 78% and 74.96% at −20 °C and 25 °C, respectively. Furthermore, the high-rate capability of the LATP-PC@LNCM811 material was markedly enhanced to 169.81 mAh g−1 at 10C relative to that of pristine LNCM811, which was approximately 137.67 mAh g−1. The electrochemical performance of LNCM811 was enhanced by the uniform dual-conductive composite coating. The results of the study indicate that the LATP-PC@LNCM811 composite material developed herein is a potentially promising material for future high-energy Li-ion batteries. 相似文献
14.
《Ceramics International》2022,48(3):3397-3403
The high-Ni layered metal oxide, LiNi0.8Co0.1Mn0.1O2 (LNCM811), has received widespread attention in the energy field because of its high specific capacity, but its large-scale applications are hindered due to severe capacity fading. Herein, a uniform and thin Li2O–B2O3–LiBr-glass (LBBrO-glass) coating was deposited on LNCM811 by a liquid-phase coating and thermal treatment method. The experimental results suggested that the LBBrO-glass coating acted as a protective layer that inhibited transition metal dissolution and side reactions, which helped improve the electrochemical properties of LNCM811. Remarkably, after 200 cycles, the 2 wt% coating (LBBrO@LNCM-2) delivered a superior capacity retention of 88.9%, while only 71.8% was obtained for the pristine material (LNCM811). The discharge capacity of LBBrO@LNCM-2 was 163.5 mAh g?1 at 5C, while it was only 139 mAh g?1 for the pristine material. 相似文献
15.
Meng Wang Yongqiang Gong Yijie Gu Yunbo Chen Lin Chen Hua Shi 《Ceramics International》2019,45(3):3177-3185
In this study, a series of ultra-thin fast ionic conductor (Li3PO4, Li2ZrO3, Li4Ti5O12) layers were successfully deposited on the surface of LiNi0.8Mn0.1Co0.1O2. The effects of three typical ionic conductors were systemically compared for the first time. The influences of coating layers on the microstructures and electrochemical properties of the cathode material were investigated by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron spectroscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and electrochemical tests. Analysis indicated that the coating layers existed on the surface of the cathode material and did not cause any noticeable change in the crystal structure. Electrochemical tests proved that all the surface-modified samples exhibited excellent cycling performance and rate capability compared to the bared sample. The inferior electrochemical performances of the bared sample were related to the formation of thick solid-electrolyte inter-facial layer during cycling, while the coating layer could minimize the side-reactions between the cathode and electrolyte during cycling. The electrons transfer and Li+ diffusion coefficient of the Li3PO4 coated sample were superior to that of Li2ZrO3 and Li4Ti5O12 coated samples, which were beneficial to the rate capability of LiNi0.8Mn0.1Co0.1O2. 相似文献
16.
A high-performance LiNi0.8Co0.2O2 cathode was successfully fabricated by a sol-gel coating of CeO2 to the surface of the LiNi0.8Co0.2O2 powder and subsequent heat treatment at 700 °C for 5 h. The surface-modified and pristine LiNi0.8Co0.2O2 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), slow rate cyclic voltammogram (CV), and differential scanning calorimetry (DSC). Unlike pristine LiNi0.8Co0.2O2, the CeO2-coated LiNi0.8Co0.2O2 cathode exhibits no decrease in its original specific capacity of 182 mAh/g (versus lithium metal) and excellent capacity retention (95% of its initial capacity) between 4.5 and 2.8 V after 55 cycles. The results indicate that the surface treatment should be an effective way to improve the comprehensive properties of the cathode materials for lithium ion batteries. 相似文献
17.
Su Jung Do P. Santhoshkumar Suk Hyun Kang K. Prasanna Yong Nam Jo Chang Woo Lee 《Ceramics International》2019,45(6):6972-6977
Li[NixCoyMnz]O2 (NCM) layered materials have been successfully adopted in commercial lithium ion batteries (LIBs). The presence of higher Ni content in cathode materials helps to improve the capacity. However, increased cation mixing on the surface of layered material leads to unstable structure. Aluminium (Al) doping is known to enhance the performance of cathode material by rendering thermal and structural stability. In this article, we synthesize Li[Ni0.8Co0.1Mn0.1]O2 (Bare NCM811) and Li[Ni0.78Co0.1Mn0.1Al0.02]O2 (Al-Doped NCM811) using simple co-precipitation process followed by calcination process. The electrochemical, morphological, and structural characteristics of the Al-Doped NCM811 are investigated and compared with the Bare NCM811. The discharge capacity of the Bare NCM811 and the Al-Doped NCM811 maintained 73.59% and 96.15% after the 100th cycle at a room temperature of 20?°C and 87.32% and 94.38% after the 50th cycle at an elevated temperature of 60?°C, respectively. The enhanced electrochemical performance of Al-Doped NCM811 is attributed to the improved thermal and structural properties of the electrode, as confirmed using differential scanning calorimeter (DSC) and particle compression tester (PCT). 相似文献
18.
LiNi0.33−xMn0.33Co0.33YxO2 materials are synthesized by Y3+ substitute of Ni2+ to improve the cycling performance and rate capability. The influence of the Y3+ doping on the structure and electrochemical properties are investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS) and galvanostatic charge/discharge tests. LiNi0.33Mn0.33Co0.33O2 exhibits the capacity retentions of 89.9 and 87.8% at 2.0 and 4.0 C after 40 cycles, respectively. After doping, the capacity retentions of LiNi0.305Mn0.33Co0.33Y0.025O2 are increased to 97.2 and 95.9% at 2.0 and 4.0 C, respectively. The discharge capacity of LiNi0.305Mn0.33Co0.33Y0.025O2 at 5.0 C remains 75.7% of the discharge capacity at 0.2 C, while that of LiNi0.33Mn0.33Co0.33O2 is only 47.5%. EIS measurement indicates that LiNi0.305Mn0.33Co0.33Y0.025O2 electrode has the lower impedance value during cycling. It is considered that the higher capacity retention and superior rate capability of Y-doped samples can be ascribed to the reduced surface film resistance and charge transfer resistance of the electrode during cycling. 相似文献
19.
The electrochemical properties of LiNi0.8Co0.2O2 coated with ZrO2 by three different coating processes (ball-milling, sol-gel method, simple grinding) were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). Results showed that the ZrO2 coating significantly improved the capacity retention of the cathode by suppressing the impedance growth at the interface between electrodes and electrolyte and the best cyclability was obtained in the case of employing the simple grinding for the ZrO2 coating. On the other hand, the initial capacities of the ZrO2-coated LiNi0.8Co0.2O2 cathode were slightly decreased. 相似文献
20.
LiNi1/3Co1/3Mn1/3O2 cathode materials have been coated with Al2O3 nano-particles using sol-gel processing to improve its electrochemical properties. The X-ray diffraction (XRD) pattern of the as-prepared Al2O3 nano-particles was indexed to the cubic structure of the γ-Al2O3 phase and had an average size of ∼4 nm. The XRD showed that the structure of LiNi1/3Co1/3Mn1/3O2 was not affected by the Al2O3 coating. However, the Al2O3 coatings on LiNi1/3Co1/3Mn1/3O2 improved the cyclic life performance and rate capability without decreasing its initial discharge capacity. These electrochemical properties were also compared with those of LiAlO2-coated LiNi1/3Co1/3Mn1/3O2 cathode material. The electrochemical impedance spectroscopy (EIS) was studied to understand the enhanced electrochemical properties of the Al2O3-coated LiNi1/3Co1/3Mn1/3O2 compared to uncoated LiNi1/3Co1/3Mn1/3O2. 相似文献