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黄培龙 《中国石油和化工标准与质量》2013,(14):47-48
本文首先论述了动力锂离子电池的安全性,介绍了常用的动力锂离子电池材料,并着重对其中几个新型锂离子电池的材料性能、合成、改性等做了详细介绍,并彼此之间进行了详细的对比,指出了新型锂离子电池的研究进展。 相似文献
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锂离子电池正极材料技术进展 总被引:2,自引:0,他引:2
概述了国内外近30 a有关锂离子电池正极材料的研究进展以及笔者在锰系正极材料方面的研究结果;
比较了几种主要正极材料的性能优缺点;阐明了正极材料发展方向。近期镍钴锰酸锂三元材料将逐步取代钴酸锂,而改性锰酸锂和镍钴锰酸锂三元材料以及两者的混合体将在动力型锂离子电池中获得广泛使用。在未来5~10 a,高容量的层状富锂高锰型正极材料或许会是下一代锂离子电池正极材料的有力竞争者。 相似文献
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锂离子电池以其优异的性能而成为近年来研究热点之一,而正极材料是锂离子电池性能提高的关键所在,本文综述了近年来发展起来的典型锂离子电池正极材料的制备、特点及性能,并对锂离子电池正极材料的发展趋势进行了展望。 相似文献
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针对高镍三元锂离子电池正极材料的降碱处理方式主要局限于去离子水洗涤且清洗效果不佳的问题,提出了一种超声强化水洗处理高镍三元锂离子电池正极材料的新方法。以LiNi0.8Co0.15Al0.05O2(NCA)为研究对象,去离子水为溶剂,通过正交试验探讨了超声强化水洗对高镍三元锂离子电池正极材料进行降碱处理的影响因素,并就单一固含量因素影响与简单去离子水洗涤进行对比。采用pH测定、粒度分析、SEM、电化学性能测试等手段进行分析,研究了固含量、搅拌时间、超声时间、超声频率、超声功率等对高镍三元锂离子电池正极材料降碱效果的影响。研究结果表明:在固含量10%、搅拌时间更均匀的情况下,颗粒表面形貌无明显影响,材料电化学性能提高。实际工业生产过程中水洗的固含量为40%更为合适。 相似文献
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锂离子电池正极材料进展 总被引:1,自引:0,他引:1
介绍了锂离子电池的发展阶段、工作原理及特点,叙述了锂电池已商业化正极材料钴酸锂、锰酸锂、磷酸铁锂的特性、合成方法及其优缺点,纳米技术锂离子电池正极材料应用及其合成方法。认为应根据现有正极材料出现的问题,通过掺杂、包覆、加入辅助剂和表面修饰改性等方法减低成本,利用纳米材料的优点和微米材料优良的稳定性和容易制备的优点合成纳微分层结构的材料解决纳米材料的低热力学稳定性、团聚及与电解液发生副反应等问题;可以尝试着探索新的方法合成纳米级颗粒.并将最优的方法应用于新材料和经典电极材料的制备,从而充分发挥纳米级材料的尺寸效应和表面效应.改善电极材料的电化学活性.有助于推进纳米正极材料的工业化进程。 相似文献
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锂离子电池正极材料LiCoPO_4具有电压高、容量大等优点,但因其导电率低没有得到广泛的应用。本文采用碳包覆的方法对LiCoPO_4进行改性研究,采用X射线衍射(XRD)和透射电镜(TEM)对碳包覆改性后的LiCoPO_4/C的结构和形貌进行表征。结果表明:不同碳掺量(0%、3%、6%、9%(wt))条件下制备的复合材料LiCoPO_4/C的特征峰与不掺碳改性的纯相LiCoPO_4的特征峰基本一致,即适量的碳掺量不会改变LiCoPO_4原有的晶型结构;当碳包覆量为9%时,制备的样品表面成功的包覆上一层活性碳,可以改善LiCoPO_4的导电率。 相似文献
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Hui Xie 《Electrochimica acta》2006,51(10):2063-2067
The Li0.98Al0.02FePO4/C (2.0 wt.%) mix-doped composite had been synthesized by adding aluminum stearate to the react precursors through solid-state reaction. The mix-doping method does not affect the olivine structure of the cathode but greatly improves its kinetics in terms of capacity delivery, cycle life and rate capability. Such an enhancement of the electrochemical properties has been ascribed to the increase of intra- and inter-crystal electronic conductivity and the reduction of the particle size, these two effects being promoted by the co-existence of the lattice doping element (Al3+) and the non-lattice doping element (C). Overcharge test indicates that this composite has excellent safety performances. 相似文献
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LiFePO4作为新一代首选的正极材料,具有材料来源广泛、价格便宜、热稳定性好、比能量高、无吸湿性、对环境友好等优点。笔者综述了LiFePO4的结构特征、充放电机理、合成方法及改性研究。 相似文献
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Copolymer from electropolymerization of thiophene and 3,4-ethylenedioxythiophene and its use as cathode for lithium ion battery 总被引:1,自引:0,他引:1
Chia-Chin Chang 《Electrochimica acta》2005,50(22):4461-4468
Electropolymerizations (EPs) of thiophene (Th), 3,4-ethylenedioxythiophene (EDOT) and the mixed monomers of Th and EDOT in 0.05 M Et4NClO4/propylene carbonate (PC) solution were performed to prepare polymer films as potential cathode materials in lithium ion battery. The incorporation of EDOT units into pure polythiophene (PTh) chain leads to large alternations on the experimental conditions of EPs and the properties of the resulting polymer films. Onset potential of the EPs was reduced with the participation of EDOT component. The resulting polymers, PTh, poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(thiophene-co-3,4-ethylenedioxythiophene) (PTh-EDOT) were then served as cathode materials to test their capabilities to transport lithium ion in 1.0 M LiPF6/ethylene carbonate/dimethyl carbonate solution. With the inherent EDOT unit, PEDOT and PTh-EDOT have better charge capacity, stability and response rate than pure PTh. Among the copolymers, PTh-EDOT (1/1) even shows better stability than pure PEDOT homopolymer, advantage of using EDOT as copolymer component is thus evaluated. 相似文献
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A simple one-step route using gas template method is applied to synthesize macroporous LiNi0.5Mn0.5O2 which is characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Telle (BET) surface area, charge–discharge tests and electrochemical impedance spectroscopy (EIS) measurements. The as-synthesized material shows pure crystalline phase of LiNi0.5Mn0.5O2, while the microstructure is comprised of macrospores ranging from 0.2 to 0.5 μm. The first discharge capacity is of 174 mAh g−1 at 0.1 C rate, which is much higher than that of the material synthesized by the conventional solid state reaction method. Furthermore, the macroporous LiNi0.5Mn0.5O2 material shows remarkable rate capacity and cycle stability, which may be attributed to the shorter lithium ion diffusion distance and better electrolyte penetration. 相似文献
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The core-shell carbon/sulfur material with high performance is prepared by a facile and fast deposit method in an aqueous solution. As sulfur ratio is 85% (w/w) in the composite, scanning electron microscope (SEM) and transmission electron microscope (TEM) observation show that the moniliform particles with 10 nm sulfur shells preserve the morphology of carbon cores. Tested as the cathode material in a lithium cell with binary organic electrolyte at room temperature, the composite shows excellent electrochemical performance. It exhibits a specific capacity up to 1232.5 mAh g−1 at the initial discharge and its specific capacity remained above 800 mAh g−1 after 50 cycles. Meanwhile, the composite also exhibits the high-rate behavior at 800 mA g−1 of current density. Assuming a complete reaction to the final product, Li2S, the utilization of the electrochemically active sulfur is about 85% at the initial cycle. Electrochemical impedance spectroscopy (EIS) is introduced to understand the impact of the microstructure of composite on electrochemistry. According to our study, a novel core-shell structural carbon/sulfur material is proposed and the key factors of the preparation are discussed. 相似文献