High capacity Li2MnSiO4/C nanocomposite prepared by sol-gel method for lithium-ion batteries

被引：94
作者：
Liu, Shuangke [1 ]
Xu, Jing [1 ]
Li, Dezhan [1 ]
Hu, Yun [1 ]
Liu, Xiang [1 ]
Xie, Kai [1 ]
机构：
[1] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2013年 / 232卷
关键词：
Lithium-ion batteries; Lithium manganese silicate; Carbon-coated; High capacity; Sol-gel; ELECTROCHEMICAL PERFORMANCE; CATHODE MATERIALS; LI2FESIO4; MN;
D O I：
10.1016/j.jpowsour.2012.12.126
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A high capacity Li2MnSiO4 (LMS)/C nanocomposite has been prepared by glucose assisted sol-gel method with in situ carbon coating. X-ray diffraction (XRD) measurements confirm the formation of orthorhombic structure with Pmn2(1) space group. Field emission scanning electron microscopy (FESEM) shows that the LMS/C powders consist of uniformly distributed nanoparticles with size in the range of 20 -50 nm and high-resolution transmission electron microscopy (HRTEM) confirms that amorphous carbon coat on the LMS nanocrystals. Electrochemical tests reveal that the LMS/C nanocomposite has a high initial discharge capacity of 253.4 mA h g(-1) at 10 mA g(-1) and superior rate capability (193.1 mA h g(-1) at 160 mA g(-1) and 149.9 mA h g(-1) at 320 mA g(-1)). The improved electrochemical performance is ascribed to coated carbon and nanoparticle size, which can enhance the electronic conductivity as well as lithium-ion diffusion coefficient. (C) 2013 Elsevier B.V. All rights reserved.
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收藏
页码：258 / 263
页数：6
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