Improved high-rate charge/discharge performances of LiFePO4/C via V-doping

被引：229

作者：

Sun, C. S. ^{[1
]}

Zhou, Z. ^{[1
]}

Xu, Z. G. ^{[1
]}

Wang, D. G. ^{[1
]}

Wei, J. P. ^{[1
]}

Bian, X. K. ^{[1
]}

Yan, J. ^{[1
]}

机构：

[1] Nankai Univ, Inst New Energy Mat Chem, Tianjin 300071, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2009年 / 193卷 / 02期

关键词：

LiFePO4; Cathode material; Lithium-ion batteries; V-doping; LI-ION BATTERIES; ELECTROCHEMICAL PERFORMANCE; LITHIUM BATTERIES; DIFFUSION;

D O I：

10.1016/j.jpowsour.2009.03.061

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：

V-doped LiFePO4/C cathode materials were prepared through a carbothermal reduction route. The microstructure was characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The electrochemical Li+ intercalation performances of V-doped LiFePO4/C were compared with those of undoped one through galvanostatic intermittent titration technique, cyclic voltamperometry, and electrochemical impedance spectrurn. V-doped LiFePO4/C showed a high discharge capacity of similar to 70 mAh g(-1) at the rate of 20 C (3400 mA g(-1)) at room temperature. The significantly improved high-rate charge/discharge capacity is attributed to the increase of Li+ ion "effective" diffusion capability. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：841 / 845

页数：5

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