导电氧化物AZO对尖晶石型LiMn<sub>2</sub>O<sub>4</sub>高温性能的改善及研究

引用本文: 夏丙波, 仇光超, 孙洪丹, 方国清, 刘伟伟, 张瑞雪, 王宏宇, 李德成. 导电氧化物AZO对尖晶石型LiMn₂O₄高温性能的改善及研究[J]. 无机化学学报, 2014, 30(4): 725-732. doi: 10.11862/CJIC.2014.125 shu

Citation: XIA Bing-Bo, QIU Guang-Chao, SUN Hong-Dan, FANG Guo-Qing, LIU Wei-Wei, ZHANG Rui-Xue, WANG Hong-Yu, LI De-Cheng. Improved Electrochemical Properties of Conducting AZO-Coated Spinel LiMn₂O₄ at 55℃[J]. Chinese Journal of Inorganic Chemistry, 2014, 30(4): 725-732. doi: 10.11862/CJIC.2014.125 shu

导电氧化物AZO对尖晶石型LiMn₂O₄高温性能的改善及研究

夏丙波 ^1, ,
仇光超 ^1, ,
孙洪丹 ^1, ,
方国清 ^2, ,
刘伟伟 ^2, ,
张瑞雪 ^1, ,
王宏宇 ^2, ,
李德成 ^{1,
,}

通讯作者: 李德成 lidecheng@suda.edu.cn

基金项目:
科技部科研院所研究开发专项基金(No.2010EG111015)资助课题；江苏省科技支撑计划-工业项目(No.BE2013006-3)资助项目。 (No.2010EG111015)资助课题；江苏省科技支撑计划-工业项目(No.BE2013006-3)

摘要: 采用溶胶凝胶法对尖晶石型LiMn₂O₄正极材料进行铝掺杂氧化锌(AZO)包覆改性,并通过XRD、SEM、EDS、TEM、EIS、ICP-AES和充放电测试等手段对其结构,形貌及电化学性能进行表征。研究结果表明,AZO包覆层有效的阻止了LiMn₂O₄颗粒和电解液的直接接触,抑制了高温下锰溶解,明显改善了LiMn₂O₄的高温循环性能。1.5wt%AZO包覆的LiMn₂O₄正极材料在高温(55℃)1C时,首次放电比容量为114mAh·g^-1,经过100次循环后,容量保持率仍高达95.4%,远高于未包覆LiMn₂O₄的70.6%。此外,1.5wt%AZO包覆的LiMn₂O₄表现出了优越的大倍率放电性能,在10C下放电比容量能达到99mAh·g^-1。

关键词:

锂离子电池;正极材料;溶胶凝胶法;LiMn₂O₄;锰溶解;导电AZO;包覆

English

Improved Electrochemical Properties of Conducting AZO-Coated Spinel LiMn₂O₄ at 55℃

1.
1 Key Laboratory of lithium-ion battery materials of Jiangsu Province, Institute of Chemical Power Sources, Soochow University, Suzhou, Jiangsu 215006, China;

Corresponding author: 李德成 lidecheng@suda.edu.cn

Received Date: 16 September 2013
Fund Project:
科技部科研院所研究开发专项基金(No.2010EG111015)资助课题；江苏省科技支撑计划-工业项目(No.BE2013006-3)资助项目。

Abstract: To improve the electrochemical properties of spinel LiMn₂O₄ cathode material, LiMn₂O₄ coated with Al doped ZnO(AZO) was prepared by sol-gel method. The effects of AZO coating on the structural and electrochemical properties were investigated by XRD, SEM, EDS, TEM, EIS, ICP-AES and charge-discharge test. The results demonstrate that AZO coating can effectively obstruct the direct contact between the cathode electrode and electrolyte and suppress the dissolution of manganese into the electrolyte. It is shown that 1.5wt% AZO-coated LiMn₂O₄ delivers a capacity of 114 mAh·g^-1 with a capacity retention of 95.4% after 100 cycles operated at 1C rate and 55 ℃, which is obviously higher than that of bare LiMn₂O₄ (70.6%). Moreover, 1.5wt% AZO-coated LiMn₂O₄ presents an excellent high-rate capability with the discharge capacity of 99 mAh·g^-1 at 10C rate.

Key words:

lithium-ion battery;cathode material;sol-gel method;LiMn₂O₄;Mn dissolution;conducting AZO;coated

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

导电氧化物AZO对尖晶石型LiMn₂O₄高温性能的改善及研究

通讯作者: 李德成 lidecheng@suda.edu.cn

English

Improved Electrochemical Properties of Conducting AZO-Coated Spinel LiMn₂O₄ at 55℃

Corresponding author: 李德成 lidecheng@suda.edu.cn

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导电氧化物AZO对尖晶石型LiMn2O4高温性能的改善及研究

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Corresponding author: 李德成 lidecheng@suda.edu.cn

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