Electrochemical Stability of Carbon Fibers Compared to Aluminum as Current Collectors for Lithium-Ion Batteries
Electrochemical Stability of Carbon Fibers Compared to Aluminum as Current Collectors for Lithium-Ion Batteries
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DOI：
10.1149/2.041210jes
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发表时间：
2012-01-01
影响因子：
3.9
通讯作者：
Nanda, Jagjit
中科院分区：
文献类型：
--
作者：
Martha, Surendra K.;Dudney, Nancy J.;Nanda, Jagjit
研究了高导电性、全石墨化、半石墨化和非石墨化碳纤维作为锂电池正极集流体在标准电解液（碳酸烷基酯/LiPF 6）中的电化学行为，并与纯铝（Al）进行了比较。由于表面膜的钝化，所有这些集流体在2.5至5V的电位范围内表现出稳定的电化学行为。碳纤维具有与Al相当的电化学稳定性，并且可以用于代替Al箔。虽然碳纤维在低于4.5V循环时不贡献任何不可逆或额外容量，但对于全石墨和半石墨纤维，当它们在> 4.5V的高电位下循环时，可能发生PF 6嵌入和脱嵌到碳纤维中。[DOI：10.1149/2.041210jes]版权所有。
The electrochemical behaviors of highly conductive, fully-graphitic, semi-graphitic and non-graphitic carbon fibers were studied as the cathode current collectors of lithium batteries in standard electrolyte (alkyl carbonate/LiPF6) solutions and compared to bare aluminum (Al). All of these current collectors demonstrate a stable electrochemical behavior within the potential range of 2.5 to 5 V, due to passivation by surface films. Carbon fibers have comparable electrochemical stability of Al and may be used in place Al foil. While the carbon fibers do not contribute any irreversible or extra capacity when they are cycled below 4.5 V, for fully-graphitic and semi-graphitic fibers PF6- intercalation and deintercalation into the carbon fiber may occur when they are cycled at high potentials >4.5 V. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.041210jes] All rights reserved.