Comparison electrochemical performances of spherical LiFePO4/C cathode materials at low and high temperatures

被引：18
作者：
Yang, Chun-Chen [1 ,3 ]
Jang, Jer-Huan [2 ,3 ]
Jiang, Ji-Rong [2 ,3 ]
机构：
[1] Ming Chi Univ Technol, Dept Chem Engn, New Taipei 243, Taiwan
[2] Ming Chi Univ Technol, Dept Mech Engn, New Taipei 243, Taiwan
[3] Ming Chi Univ Technol, Battery Res Ctr Green Energy, New Taipei 243, Taiwan
来源：
INTERNATIONAL CONFERENCE ON APPLIED ENERGY, ICAE2014 | 2014年 / 61卷
关键词：
Spray dry; LiFePO4; Li4Ti5O12 (LTO); surface modified; Li ion batteries; CARBON-COATED LIFEPO4; HIGH TAP-DENSITY; HYDROTHERMAL SYNTHESIS; LITHIUM; OLIVINES;
D O I：
10.1016/j.egypro.2014.12.136
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The spherical LiFePO4/C composite material was prepared by the solid-state method and a spray dry method. The surface modification was conducted on spherical LFP/C composite by using 3wt.% Li4Ti5O12 (LTO) to improve the rate capability and cycle stability properties at a low temperature of -20 degrees C and a high temperature of 55 degrees C. The characteristic properties were examined by X-ray diffraction (XRD), micro-Raman, scanning electron microscopy (SEM), AC impedance method, and galvanostatic charge-discharge method. For comparison, the as-prepared LiFePO4/C cathode, SP LFP/C composite, and 3%LTO-modified spherical LiFePO4/C composite are studied and compared. As a result, the LTO-modified spherical LiFePO4/C composite displays the discharge capacities of 150, 145, 135, 110, 95 and 90 mAh g(-1) at 0.1C, 0.2C, 0.5C, 1C, 3C and 5C rates, respectively. It is demonstrated that the LTO-modified spherical LiFePO4/C composite material exhibit a good candidate for application in Li ion batteries. (C) 2014 The Authors. Published by Elsevier Ltd.
引用
收藏
页码：1402 / 1409
页数：8
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