Purification and carbon-film-coating of natural graphite as anode materials for Li-ion batteries

被引:55
作者
Zhao, Haipeng
Ren, Jianguo
He, Xiangming [1 ]
Li, Jianjun
Jiang, Changyin
Wan, Chunrong
机构
[1] Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 10084, Peoples R China
[2] Pingdingshan Inst Technol, Henan 467000, Peoples R China
关键词
natural graphite; lithium ion battery; coating; oxidization; resorcinol-formaldehyde; concentrated acid;
D O I
10.1016/j.electacta.2007.03.050
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A process of modification of natural graphite materials as anode for lithium ion batteries was attempted. The process started with the treatment of natural graphite with concentrated hydrochloric acid and concentrated sulfuric acid in a thermal autoclave, followed by the in situ polymerization of resorcinol-formaldehyde resin to coat the graphite, then heat-treatment. SEM, XRD, Raman and electrochemical charge-discharge analysis showed that the surface defects and impurities on natural graphite were eliminated by purification of the concentrated acids, and carbon-film encapsulation modified the surface structure of the graphite and reduced its BET surface area. The as-obtained natural graphite sample presented an initial charge-discharge coulombic efficiency of 88.4% and a reversible capacity of 355.8 mAh g(-1). The proposed process paves a way to prepare a promising anode material with excellent performance with low cost of natural graphite for rechargeable lithium ion batteries. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6006 / 6011
页数:6
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