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.

引用

页码：258 / 263

页数：6

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