天然石墨球-热解炭核壳结构的制备及电化学性能研究(英文)

被引：24

作者：

刘树和

英哲

王作明

李峰

白朔

闻雷

成会明

机构：

[1] 中国科学院金属研究所沈阳材料科学国家(联合)实验室

来源：

新型炭材料 | 2008年 / 01期

关键词：

流化床化学气相沉积; 核-壳结构; 热解炭; 改性天然石墨; 锂离子二次电池;

D O I：

暂无

中图分类号：

TB383.4 [];

学科分类号：

摘要：

通过化学气相沉积的方法,以乙炔为碳源,天然石墨球为原料,采用不同流化床CVD工艺和不同的反应时间,制备出具有光滑表面或颗粒状热解炭包覆层的核-壳构型改性天然石墨球。改性天然石墨球的核体是具有高度有序石墨结构的天然石墨,而壳体是无序结构的热解炭。与天然石墨球相比,具有核-壳结构的改性天然石墨球的首次库仑效率和循环性能都得到显著改善。尤其是具有颗粒状热解炭包覆层的改性石墨具有优异的循环性能,在41次循环后其放电容量仍为首次容量的84%,这一改善归因于表面沉积的颗粒状热解炭有效地降低了改性天然石墨颗粒之间的接触电阻和增加了接触面积。

引用

页码：30 / 36

页数：7

共 14 条

[1]

Carbon coatings with olive oil, soybean oil and butter on nano-LiFePO 4[J] . Ketack Kim,Ji Hwa Jeong,Ick-Jun Kim,Hyun-Soo Kim.Journal of Power Sources . 2007 (2)

[2] Electrochemical performance of pyrolytic carbon-coated natural graphite spheres [J].

Zhang, Hong-Li ;

Liu, Shu-He ;

Li, Feng ;

Bai, Shuo ;

Liu, Chang ;

Tan, Jun ;

Cheng, Hui-Ming .

CARBON, 2006, 44 (11) :2212-2218

[3] Pyrolytic polyurea encapsulated natural graphite as anode material for lithium ion batteries [J].

Zhou, YF ;

Xie, S ;

Chen, CH .

ELECTROCHIMICA ACTA, 2005, 50 (24) :4728-4735

[4]

Pyrocarbon-coating on powdery hard-carbon using chemical vapor infiltration and its electrochemical characteristics[J] . Yoshimi Ohzawa,Yasuyuki Yamanaka,Kazuhisa Naga,Tsuyoshi Nakajima.Journal of Power Sources . 2005 (1)

[5] Improvement on the electrochemical characteristics of graphite anodes by coating of the pyrolytic carbon using tumbling chemical vapor deposition [J].

Han, YS ;

Lee, JY .

ELECTROCHIMICA ACTA, 2003, 48 (08) :1073-1079

[6] Kinetics of surface reactions in carbon deposition from light hydrocarbons [J].

Norinaga, K ;

Hüttinger, KJ .

CARBON, 2003, 41 (08) :1509-1514

[7] Preparation of negative electrodes for lithium-ion rechargeable battery by pressure-pulsed chemical vapor infiltration of pyrolytic carbon into electro-conductive forms [J].

Ohzawa, Y ;

Mitani, M ;

Suzuki, T ;

Gupta, V ;

Nakajima, T .

JOURNAL OF POWER SOURCES, 2003, 122 (02) :153-161

[8]

Cycling performance of low-cost lithium ion batteries with natural graphite and LiFePO 4[J] . Joongpyo Shim,Kathryn A. Striebel.Journal of Power Sources . 2003

[9] Anode materials for lithium ion batteries by oxidative treatment of common natural graphite [J].

Wu, YP ;

Jiang, C ;

Wan, C ;

Holze, R .

SOLID STATE IONICS, 2003, 156 (03) :283-290

[10] Poly (acrylonitrile) encapsulated graphite as anode materials for lithium ion batteries [J].

Guo, KK ;

Pan, QM ;

Fang, SB .

JOURNAL OF POWER SOURCES, 2002, 111 (02) :350-356

← 1 2 →