Electrochemical performance of LiFePO4 @C composites with biomorphic porous carbon loading and nano-core-shell structure

被引：12
作者：
Gao, Peng-Zhao [1 ]
Wang, Ling [1 ]
Li, Dong-Yun [2 ]
Yan, Bing [1 ]
Gong, Wei-Wei [1 ]
机构：
[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China
[2] China Jiliang Univ, Coll Mat Sci & Engn, Hangzhou 310018, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2014年 / 40卷 / 08期
关键词：
Double electrical conductive network; Electrochemical properties; LiFePO4 @C/C composites; Nanostructures; Synergy effect; CATHODE MATERIAL; ELECTRICAL-PROPERTIES; HYBRID; SYSTEMS; STORAGE;
D O I：
10.1016/j.ceramint.2014.04.164
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effect of biomorphic porous carbon (BPC) addition on the composition, microstructure, and electrochemical performance of LiFePO4 @C/C composites was investigated. Results indicated that network pores of BPC were almost completely filled by LiFePO4 @C nanoparticles, which were formed by an olivine structure LiFePO4 core with size that ranged from 58.6 nm to 80.1 nm and an amorphous carbon shell with a thickness of approximately 2 nm. Double electrical conductive networks formed in the composites improved the electrical properties of samples from 2.59 x 10(-6) S cm(-1) (sample A-0) to 5.76 x 10(-2) S cm(-1) (sample A-20). Synergy effect of electric double layer energy storage produced by BPC and lithium-ion extraction/insertion energy storage by LiFePO4 clearly reduced the capacity reduction rate of composites, and obtained a charge/discharge capacity of 114.2/110.5 mA h g(-1) (sample A-5) at 10 C. Moreover, addition of BPC showed a significant advantage in reducing the interfacial resistance of the electrode reaction in composites from 86.72 Omega (sample A-0) to 37.58 Omega (sample A-20). The electrical conductive mechanism of LiFePO4@C/C composites is discussed. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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页码：13009 / 13017
页数：9
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