Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第4期    总第85期    2006年4月

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文章编号: 1004-0609(2006)04-0739-07
锂离子电池正极材料LiFe0.9Ni0.1PO4的合成与性能
王晓琼,李新海,王志兴,郭华军,彭文杰,刘凤举

(中南大学 冶金科学与工程学院, 长沙 410083)

摘 要:  采用高温固相法合成锂离子电池正极材料LiFe0.9Ni0.1PO4,研究了反应条件对合成产物的影响。 利用X射线衍射(XRD)和扫描电镜(SEM)对所得样品的晶体结构、 表面形貌等进行了表征。 结果表明: 反应温度和时间对LiFe0.9Ni0.1PO4晶体结构及材料性能均有较大影响,其中650 ℃下焙烧20 h合成出的样品电化学性能最佳; 在20 mA/g的电流密度下进行恒流充放电时,首次放电比容量可达145 mA·h/g, 循环30次后比容量仍为135 mA·h/g,容量衰减仅为6.9%。

 

关键词:  LiFePO4; 锂离子电池; 正极材料; 镍掺杂; 固相反应; 电化学性能

Synthesis and performance of LiFe0.9Ni0.1PO4 as cathode material in lithium-ion battery
WANG Xiao-qiong, LI Xin-hai, WANG Zhi-xing, GUO Hua-jun,
PENG Wen-jie, LIU Feng-ju

School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China

Abstract: LiFe0.9Ni0.1PO4 for cathode materials of lithium-ion battery was synthesized by solid-state reaction. The effects of synthesis temperature and reaction time on the electrochemical performance were studied systematically. The crystalline structure and microstructures of resulting specimens were characterized by X-ray diffractometry (XRD) and scanning electromicroscopy (SEM). The results show that the reaction temperature and time have great effect on the structures and electrochemical performance of the obtained samples. Further electrochemical tests indicate that the material synthesized optimally at 650 ℃ for 20 h possesses excellent electrochemical performance. The first discharge capacity of LiFe0.9Ni0.1PO4 on 20 mA/g current density arrives at 145 mA·h/g and after 30 times cycling the discharge capacity is still up to 135 mA·h/g, only with about 6.9% capacity fade.

 

Key words: lithium iron phosphate; lithium-ion battery; cathode material; Ni-doping; solid-state reaction; electrochemical performance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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