优化碳包覆对正极材料LiFePO<sub>4</sub>/C高倍率性能的影响

引用本文: 余红明, 郑威, 曹高劭, 赵新兵. 优化碳包覆对正极材料LiFePO₄/C高倍率性能的影响[J]. 物理化学学报, 2009, 25(11): 2186-2190. doi: 10.3866/PKU.WHXB20091113 shu

Citation: YU Hong-Ming, ZHENG Wei, CAO Gao-Shao, ZHAO Xin-Bing. Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO₄/C Composites[J]. Acta Physico-Chimica Sinica, 2009, 25(11): 2186-2190. doi: 10.3866/PKU.WHXB20091113 shu

优化碳包覆对正极材料LiFePO₄/C高倍率性能的影响

摘要:

碳包覆层的结构和形态对LiFePO4正极材料的电子电导率影响很大. 本文以聚丙烯和葡萄糖为碳源, 二茂铁为催化剂前驱体, 采用原位固相法合成LiFePO4/C复合材料, 并对其微观结构和形貌, 碳的结构与含量, 电化学性能进行分析. 结果表明, 聚丙烯热解形成的碳包覆层石墨化程度高, 可提高材料的高倍率放电性能. 二茂铁的加入有助于优化包覆层的碳结构. 制备的LiFePO4/C复合材料具有优异的高倍率电化学性能, 10C (1C=170 mA·g-1)放电比容量达到145 mAh·g-1.

关键词:

正极材料
/ LiFePO4
/ 碳包覆
/ 石墨化
/ 二茂铁

English

Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO₄/C Composites

1.
Department of Materials Science and Engineering, Zhejing University, Hangzhou 310027, P. R. China
Received Date: 19 May 2009
Available Online: 28 October 2009

Abstract:

The structure and morphology of coating carbon play an important role in improving the electronic conductivity of lithium iron phosphate. LiFePO4/C composites were synthesized using an in-situ solid state method while polypropylene and glucose were used as carbon sources. Ferrocene was used as a catalyst precursor to graphitize the pyrolytic carbon. The microstructure and morphology of lithium iron phosphate together with the amounts and structure of the coating carbon were investigated in detail. It is shown that the pyrolysis of polypropylene forms well graphitized carbon-coatings and thus improves the high-rate performance of the material. Ferrocene is effective in optimizing the carbon structure. A LiFePO4/C composite with an excellent high-rate capacity of 145 mAh·g-1 at 10C (1C=170 mA·g-1) was synthesized.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

优化碳包覆对正极材料LiFePO₄/C高倍率性能的影响

English

Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO₄/C Composites

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中国化学会秘书处

优化碳包覆对正极材料LiFePO4/C高倍率性能的影响

English

Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO4/C Composites

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

优化碳包覆对正极材料LiFePO₄/C高倍率性能的影响

Effects of Optimized Carbon-Coating on High-Rate Performance of LiFePO₄/C Composites

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs