溶胶-凝胶法制备LiMnPO4/C正极材料及其电化学性能

doi:10.3724/SP.J.1077.2013.12268

无机材料学报 ›› 2013, Vol. 28 ›› Issue (4): 415-419.DOI: 10.3724/SP.J.1077.2013.12268 CSTR: 32189.14.SP.J.1077.2013.12268

溶胶-凝胶法制备LiMnPO₄/C正极材料及其电化学性能

汪燕鸣, 王飞, 王广健

(淮北师范大学化学与材料科学学院, 淮北235000)

收稿日期:2012-04-26 修回日期:2012-05-28 出版日期:2013-04-10 网络出版日期:2013-03-20
作者简介:汪燕鸣(1979–), 女, 讲师. E-mail: wangyanming66@126.com
基金资助:
安徽省优秀青年人才基金(2012SQRL226ZD);淮北师范大学青年科研资助项目(201132)

Sol-Gel Synthesis and Electrochemical Performance of LiMnPO₄/C Cathode Material

WANG Yan-Ming, WANG Fei, WANG Guang-Jian

(School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, China)

Received:2012-04-26 Revised:2012-05-28 Published:2013-04-10 Online:2013-03-20
About author:WANG Yan-Ming. E-mail: wangyanming66@126.com
Supported by:
Special Foundation for Outstanding Young Scientists of Anhui Province (2012SQRL226ZD);Youth Research Program of Huaibei Normal University (201132)

摘要/Abstract

摘要：

以月桂酸为碳源, 磷酸三丁酯为反应物和络合剂, 采用溶胶-凝胶法合成了LiMnPO₄/C锂离子电池复合正极材料。利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对其晶体结构和微观形貌进行表征。结果表明, 在700℃下焙烧制备的材料为结晶良好的纯相橄榄石结构; 具有类球形微米级大颗粒形貌, 由粒径50~100 nm的小颗粒堆积而成, 小颗粒表面包覆一层较均匀的碳层。循环伏安曲线和充放电测试表明, LiMnPO₄/C复合材料具有优良的电化学性能。在室温0.05C和0.5C倍率下, 首次放电容量分别为141和113 mAh/g, 并具有良好的循环稳定性和高低温充放电性能。

关键词: 锂离子电池, 磷酸锰锂, 溶胶-凝胶法, 磷酸三丁酯, 月桂酸

Abstract:

LiMnPO₄/C composite as a cathode material for lithium ion batteries was synthesized via a Sol-Gel method using tributyl phosphate as both chelating agent and phosphor source while lauric acid as a carbon source. Crystalline structure and morphology of the composite were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results indicate that the LiMnPO₄/C composite is well crystallized as an olivine structure without any detectable impurity phase at annealing temperature of 700℃. The spherical-like LiMnPO₄/C microparticles are composed of large numbers of nanoparticles with the size ranging from 50 nm to 100 nm, which are covered with a thin carbon layer. Cyclic voltammetry and galvanostatic charge-discharge tests reveal that LiMnPO₄/C composite has superior electrochemical performance. The initial discharge capacities of LiMnPO₄/C are 141 and 113 mAh/g at rates of 0.05C and 0.5C under room temperature, respectively, along with high cyclic stability and good charge-discharge performances under high and low temperatures.

Key words: lithium ion batteries, LiMnPO₄, Sol-Gel method, tributyl phosphate, lauric acid

中图分类号:

TM912

汪燕鸣, 王飞, 王广健. 溶胶-凝胶法制备LiMnPO₄/C正极材料及其电化学性能[J]. 无机材料学报, 2013, 28(4): 415-419.

WANG Yan-Ming, WANG Fei, WANG Guang-Jian. Sol-Gel Synthesis and Electrochemical Performance of LiMnPO₄/C Cathode Material[J]. Journal of Inorganic Materials, 2013, 28(4): 415-419.

图/表 6

图1 LiMnPO4/C复合材料的XRD图谱

Fig. 1 XRD pattern of the LiMnPO4/C composite

图2 LiMnPO4/C复合材料的SEM(a,b)和TEM(c,d)照片

Fig. 2 SEM (a,b) and TEM (c,d) images of the LiMnPO4/C composite

图3 LiMnPO4/C复合材料的首次和第二次循环伏安曲线

Fig. 3 Cyclic voltammograms of the LiMnPO4/C composite at the first and second cycles

图4 不同温度下, LiMnPO4/C复合材料在 0.05C倍率下首次循环的充放电曲线

Fig. 4 The initial charge/discharge profiles of the LiMnPO4/C composite at 0.05C rate under different temperatures

图5 不同温度下, LiMnPO4/C复合材料在0.05C倍率下的循环性能

Fig. 5 Cycling performances of the LiMnPO4/C composite at 0.05C rate under different temperatures

图6 室温下, LiMnPO4/C复合材料在不同倍率下的放电曲线(a)和循环性能(b)

Fig. 6 The discharge profiles (a) and cycling performances (b) of the LiMnPO4/C composite at various rates under room temperature

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溶胶-凝胶法制备LiMnPO₄/C正极材料及其电化学性能

Sol-Gel Synthesis and Electrochemical Performance of LiMnPO₄/C Cathode Material

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