V2O3 modified LiFePO4/C composite with improved electrochemical performance

被引：118

作者：

Jin, Y. ^{[1
]}

Yang, C. P. ^{[1
]}

Rui, X. H. ^{[1
]}

Cheng, T. ^{[2
]}

Chen, C. H. ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China

[2] Nanjing Univ Sci & Technol, Nanjing 210094, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2011年 / 196卷 / 13期

基金：

美国国家科学基金会;

关键词：

Lithium iron phosphate; Vanadium oxide; Lithium ion battery; Cathode; Diffusion coefficient; HYDROTHERMAL SYNTHESIS; PHOSPHO-OLIVINES; LITHIUM; CATHODE; CARBON; BATTERIES;

D O I：

10.1016/j.jpowsour.2011.02.059

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：

In addition to lattice doping and carbon-coating, surface modification with other metal oxides can also improve the electrochemical performance of LiFePO4 powders. In this work, highly conductive vanadium oxide (V2O3) is in situ produced during the synthesis of carbon-coated LiFePO4(LiFePO4/C) powders by a solid state reaction process and acts as a surface modifier. The structures and compositions of LiFePO4/C samples containing 0-10 mol% vanadium are analyzed by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. Their electrochemical properties are also characterized with galvanostatic cell cycling and cyclic voltamrnetry. It is found that vanadium is present in the form of V2O3 that is incorporated in the carbon phase. The vanadium-modified LiFePO4/C samples show improved rate capability and low-temperature performance. Their apparent lithium diffusion coefficient is in the range of 10(-12) to 10(-10) cm(2)s(-1) depending on the vanadium content. Among the investigated samples, the one with 5 mol% vanadium exhibits the best electrochemical performance. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：5623 / 5630

页数：8

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