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

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: LI De-Cheng,
Received Date: 16 September 2013
Available Online: 18 November 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。 (No.2010EG111015)资助课题；江苏省科技支撑计划-工业项目(No.BE2013006-3)

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.
- lithium-ion battery;cathode material;sol-gel method;LiMn₂O₄;Mn dissolution;conducting AZO;coated
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Improved Electrochemical Properties of Conducting AZO-Coated Spinel LiMn₂O₄ at 55℃