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稀土掺杂在锂离子电池中的应用进展 总被引:1,自引:0,他引:1
阐述了锂离子电池技术发展的重要性,综述了稀土掺杂在锂离子电池正极材料、负极材料及固体电解质中的应用.重点介绍了稀土掺杂在锂离子电池正极材料中的应用,并提出稀土掺杂有利于电池比容量的提高,从而有利于进一步提高锂离子电池的比能量和循环性能.展望了稀土掺杂在锂离子电池中的发展前景,并认为这些技术将是未来锂离子电池研究的重要方向. 相似文献
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锂离子电池在储能、电动能源等领域应用广泛,但锂离子电池在所应用的新能源汽车领域存在某些方面的安全问题,制约着商业化运用。提出通过单电池组生产和严格的质量控制提高汽车锂离子电池安全系数的具体措施,进一步研究了单体锂离子电池的正极材料、负极材料、隔膜、电解液以及电池壳体等方面的安全保护措施。结果表明:通过合理的系统设计以及克服电池本身的技术缺陷,能使新能源汽车的使用更加安全。 相似文献
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综合论述了锂离子电池正极材料尖晶石锂锰氧化物的制备方法,并对一些制备方法进行了简略分析,为锂离子电池正极材料的研究提供技术信息,为锂离子电池正极材料的规模化生产提供工艺参考。 相似文献
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锂离子电池具有能量密度高、自放电小和循环寿命长等优点,被广泛用于便携式电子设备和电动汽车等方面,不断推动着社会朝着智能化和清洁化方向发展。简要阐述了锂离子电池的发展历程和工作原理,从材料结构和储锂机制方面对正极材料和负极材料进行分类并综述其性能特点与研究现状,介绍了液态电解液中锂盐、溶剂、添加剂以及固态电解质在锂离子电池中的作用,重点讨论了锂离子全电池的应用和安全问题,最后对锂离子电池的发展趋势进行了总结和展望。相信随着这些重点、难点技术和关键材料的突破,性能更加优异的锂离子电池必定会更好地造福人类。 相似文献
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中子照相是20世纪60年代兴起的一种射线照相无损检测技术。中子与常规X射线原理相类似,但在穿透物体时的吸收特性显著不同,因此两种照相技术在适用范围上有一定的互补关系。国外中子照相技术已在航空航天、生物、考古、电子等方面有成功应用,国内由于中子源资源不易获得,应用研究滞后。简要介绍了中子照相技术的原理和检测系统构成,其基本构成为中子源、准直器和像探测器。阐述了中子照相技术的发展过程及国内外发展现状,列举了中子照相技术目前的国外的主要标准和工程应用情况,最后从研制移动式中资源、开展工业应用研究,建立相关标准等方面对我国中子照相技术发展趋势进行了展望。 相似文献
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指出了锂离子电池的特点和优势,分析了报废锂离子电池的成分及国内外研究现状,总结了报废锂离子电池的处置方法,最后介绍了回收处理废锂离子电池后对其废水、废气、固体废物以及噪声做出处理,为其可进行产业化回收提供了条件. 相似文献
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LiCoO2结构及性能与锂离子电池电压特性的关系 总被引:7,自引:0,他引:7
采用激光衍射 ,BET ,XRD ,SEM等方法 ,研究了系列LiCoO2 正极材料的一些物理化学性能及其与锂离子电池电压特性的关系 ,并对由 3种LiCoO2 样品制成的试验电池进行了电压特性和循环寿命的测试 ,得出了制备有良好电压特性的锂离子电池用LiCoO2 正极材料所应具备的性能 :XRD谱线中I0 0 3 /I10 4 的值较大 ,颗粒分布均匀无团聚 ,表面光滑平整。 相似文献
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Jianlin Li Zhijia Du Rose E. Ruther Seong Jin AN Lamuel Abraham David Kevin Hays Marissa Wood Nathan D. Phillip Yangping Sheng Chengyu Mao Sergiy Kalnaus Claus Daniel David L. WoodIII 《JOM Journal of the Minerals, Metals and Materials Society》2017,69(9):1484-1496
Reducing cost and increasing energy density are two barriers for widespread application of lithium-ion batteries in electric vehicles. Although the cost of electric vehicle batteries has been reduced by ~70% from 2008 to 2015, the current battery pack cost ($268/kWh in 2015) is still >2 times what the USABC targets ($125/kWh). Even though many advancements in cell chemistry have been realized since the lithium-ion battery was first commercialized in 1991, few major breakthroughs have occurred in the past decade. Therefore, future cost reduction will rely on cell manufacturing and broader market acceptance. This article discusses three major aspects for cost reduction: (1) quality control to minimize scrap rate in cell manufacturing; (2) novel electrode processing and engineering to reduce processing cost and increase energy density and throughputs; and (3) material development and optimization for lithium-ion batteries with high-energy density. Insights on increasing energy and power densities of lithium-ion batteries are also addressed. 相似文献
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Molybdenum phosphide (MoP) has attracted extensive attention as promising anode candidates for lithium-ion batteries owing to its high specific capacity,low potential range and low polarization.However,severe volume changes and intrinsic low conductivity are major challenges for further application of MoP electrode materials.In this work,a coral-like MoP microsphere encapsulated by N-doped carbon (MoP@NDC) was successfully prepared through annealing the precursor derived from self-polymerization of dopamine with phosphomolybdic acid.The introduction of carbon framework not only serves as matrix to confine MoP nanocrystals from aggregations,but also improves the electrochemical conductivity and facilitates lithium ion or electron transport on the surface of MoP.Such hierarchical structure delivered high discharge capacity of 495 mAh g-1 after 300 cycles with 90.1% capacity retention,which could be attributed to the synergistic effects of MoP nanoparticles and conductive carbon network.This design strategy shows MoP@NDC electrode with applicable application as anode in lithium-ion battery. 相似文献
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Eun-Gi Shim Tae-Heum Nam Jung-Gu Kim Hyun-Soo Kim Seong-In Moon 《Metals and Materials International》2009,15(4):615-621
Safety concerns related to lithium-ion batteries have been the key obstacle to their application in hybrid electric vehicles.
Trioctyl Phosphate (TOP) and Cresyl Diphenyl Phosphate (CDP) were studied as potential flame-retarding additives for lithium-ion
batteries. The electrochemical performance and thermal stability of the additive-containing electrolytes, in combination with
a cell comprising a LiCoO2 cathode and Mesocarbon Microbeads (MCMB) anode, were tested in coin cells. Cyclic Voltammetry (CV), Differential Scanning
Calorimetry (DSC), Electrochemical Impedance Spectroscopy (EIS), and Scanning Electron Microscopy (SEM) were used for the
experimental analysis. The study results revealed that CDP addition at 5 wt.% improved the cell stability due to the lower
rate of the charge-transfer resistance increase over 30–50 cycles. CDP was demonstrated to be a better flame-retarding additive
than TOP. 相似文献
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加氢反应器壁原子氢分布的在线,实时,无损检测新技术 总被引:1,自引:0,他引:1
为了在线,实时,无损检测高温高压条件下运行的加氢反应器的多层器壁中原子氢的渗透速率和在任何指定剖面上的体浓度分布,发展了一种新型的检测技术,介绍了检测仪的结构设计及其特征。 相似文献
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以Mn3O4为前驱体制备尖晶石型LiMn2O4及其性能 总被引:1,自引:0,他引:1
采用改进的固相反应法合成了高性能的锂离子电池正极材料LiMn2O4。首先,以廉价的MnSO4为原料,通过水解氧化法制备纳米级Mn3O4前驱体;然后,将Mn3O4和Li2CO3混合均匀,在750℃固相反应20 h,得到尖晶石型LiMn2O4。用X射线衍射(XRD)和扫描电镜(SEM)对Mn3O4前驱体和LiMn2O4样品进行表征,用充放电测试和循环伏安技术对LiMn2O4样品进行电化学性能研究。结果表明:所制备的LiMn2O4具有完整的尖晶石型结构,且晶体粒子分布均匀。所制备的LiMn2O4材料在3.0~4.4 V之间,室温(25℃)下,在0.2C倍率下首次放电比容量为130.6 mA.h/g;在0.5C倍率下首次放电比容量为127.1 mA.h/g,30次循环后,容量仍有109.5 mA.h/g,且样品具有较好的高温性能。 相似文献
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《稀有金属(英文版)》2016,(4)
Since lithium-ion battery with high energy density is the key component for next-generation electrical vehicles,a full understanding of its thermal behaviors at different discharge rates is quite important for the design and thermal management of lithium-ion batteries(LIBs)pack/module.In this work,a 25 Ah pouch type Li[Ni_(0.7)Co_(0.15)Mn_(0.15)]O_2/graphite LIBs with specific energy of200 Wh kg~(-1)were designed to investigate their thermal behaviors,including temperature distribution,heat generation rate,heat capacity and heat transfer coefficient with environment.Results show that the temperature increment of the charged pouch batteries strongly depends on the discharge rate and depth of discharge.The heat generation rate is mainly influenced by the irreversible heat effect,while the reversible heat is important at all discharge rates and contributes much to the middle evolution of the temperature during discharge,especially at low rate.Subsequently,a prediction model with lumped parameters was used to estimate the temperature evolution at different discharge rates of LIBs.The predicted results match well with the experimental results at all discharge rates.Therefore,the thermal model is suitable to predict the average temperature for the large-scale batteries under normal operating conditions. 相似文献
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Silicon has been investigated extensively as a promising anode material for rechargeable lithium-ion batteries. Understanding the failure mechanism of silicon-based anode electrodes for lithium-ion batteries is essential to solve the problem of low coulombic efficiency and capacity fading on cycling and also to further commercialize this very new energetic material in cells. To reach this goal, the structure changes of bulk silicon particles and electrode after cycling were studied using ex-situ scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The SEM images indicated that the microstructural changes of the bulk silicon particles during cycling led to a layer rupture of the electrode and then the breakdown of the conductive network and the failure of the electrode. The result contributes to the basic understanding of the failure mechanism of a bulk silicon anode electrode for lithium-ion batteries. 相似文献
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Su-Zhe Liang Xiao-Yan Wang Yong-Gao Xia Sen-Lin Xia Ezzeldin Metwalli Bao Qiu Qing Ji Shan-Shan Yin Shuang Xie Kai Fang Lu-Yao Zheng Mei-Mei Wang Xiu-Xia Zuo Ru-Jiang Li Zhao-Ping Liu Jin Zhu Peter Müller-Buschbaum Ya-Jun Cheng 《金属学报(英文版)》2018,31(9):910
A facile scalable synthesis of hierarchical Sb/C micro-/nanohybrid has been addressed in this work,which possesses the advantages of both micrometer and nanometer scale structures as lithium-ion battery anode.Difunctional methacrylate monomers are used as solvent and carbon source as well.Liquid precursor of antimony(III) n-butoxide is dissolved in the resin monomer solution,and further incorporated into the cross-linking polymer network via photo polymerization.Through calcination in argon/hydrogen atmosphere,antimony nanoparticles are in situ formed by carbothermal reduction,and homogeneously embedded in the in situ formed micrometer sized carbon matrix.The morphology,structure,crystallinity,spatial dispersion,composition,and electrochemical performance of the Sb/C micro-/nanohybrid are systematically investigated.The cyclic and rate performance of the Sb/C micro-/nanohybrid anode have been effectively improved compared to the pure carbon anode.A reversible capacity of 362 m Ah g~(-1) is achieved with a reasonable mass loading density after 300 cycles at 66 m A g~(-1),corresponding to capacity retention of 79%.With reducing mass loading density,the reversible capacity reaches 793 m Ah g~(-1) after 100 cycles.Moreover,the electrochemical performance of Sb/C micro-/nanohybrid as sodium-ion battery anode is also investigated in this study. 相似文献
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《稀有金属(英文版)》2019,(12)
The lithium-ion capacitor is a promising energy storage system with a higher energy density than traditional supercapacitors.However,its cycling and rate performances,which depend on the electrochemical properties of the anode,are still required to be improved.In this work,soft carbon anodes reinforced using carbon-Si composites of various compositions were fabricated to investigate their beneficial influences on the performance of lithium-ion capacitors.The results showed that the specific capacities of the anodes increased significantly by 16.6 mAh g~(-1) with 1.0 wt% carbon-Si composite,while the initial discharge efficiency barely changed.The specific capacity of the anode with a 10.0 wt% carbon-Si composite reached 513.1 mAh g~(-1),and the initial discharge efficiency was 83.79%.Furthermore,the anodes with 7.5 wt% or lower amounts of carbon-Si composite demonstrated reduced charge transfer resistances,which caused an improvement in the rate performance of the lithium-ion capacitors.Moreover,the use of the optimized amount(7.5 wt%) of carbon-Si composite in the anode could significantly improve the cycling performance of the lithium-ion capacitor by compensating the consumption of active lithium.The capacity retention of the lithium-ion capacitor reached 95.14% at 20 C after 10,000 cycles,while the anode potential remained below 0.412 V,which is much lower than that of a soft carbon anode. 相似文献