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15卷    第8期    总第77期    2005年8月

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文章编号:1004-0609(2005)08-1300-05
Li1.05Ni0.05Mn1.9O4正极材料脱锂过程中的结构变化
师绍纯, 曹高劭, 涂 健, 赵新兵, 涂江平

(浙江大学 材料科学与工程系, 杭州 310027)

摘 要:  与未掺杂的尖晶石LiMn2O4进行比较,用固相混合合成法制得的结晶良好的尖晶石Li1.05Ni0.05Mn1.9O4正极材料在室温和55 ℃下的循环性能都能得到较大改善, 首次放电容量在室温和55 ℃分别保持理论容量的92.6%和91.5%。 在常温条件下, 以0.5 C充放电倍率循环50次, 容量保持为首次放电容量的95.3%。 采用非原位X射线衍射的方法对不同脱锂状态的Lix[Li0.05Ni0.05Mn1.9]O4 (0.1<x<1)试样进行了结构分析。 结果表明: Li、 Ni的协同掺杂明显减小了晶格参数的变化, 稳定了试样的结构及改善了电池循环性能。

 

关键词:  锂离子电池; 正极材料; Li1.05Ni0.05Mn1.9O4;非原位X射线衍射; 晶格参数

Structure change of Li1.05Ni0.05Mn1.9O4
cathode material during Li extraction
SHI Shao-chun, CAO Gao-shao, TU Jian, ZHAO Xin-bing,
TU Jiang-ping

Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China

Abstract: Li1.05Ni0.05Mn1.9O4 cathode material with spinel structure was synthesized after solid-state mixing. Compared with spinel LiMn2O4, the cyclic stability of Li1.05Ni0.05Mn1.9O4 was improved both at room temperature and 55 ℃. The first discharge capacities of Li1.05Ni0.05Mn1.9O4 are 92.6% and 91.5% of the theoretical capacity at room temperature and 55 ℃. After 50 cycles with 0.5 C charging-discharging rate at room temperature, the capacity is still 95.3% of the first discharging capacity. Ex-situ X-ray diffraction(XRD) was used to analyze the structures of different Li extraction states of Lix[Li0.05Ni0.05Mn1.9]O4 (0.1<x<1). The results indicate that adding Li and Ni ions into LiMn2O4-based compound restrains the change of lattice parameter, stabilizes the structure of the sample and improves the cyclic performance.

 

Key words: lithium-ion battery; cathode material; Li1.05Ni0.05Mn1.9O4; ex-situ X-ray diffraction; lattice parameter

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

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

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