Effect of Zn doping on the performance of LiMnPO₄ cathode for lithium ion batteries

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• 作者：Haisheng Fang^a ; ^b ; ^c ; ^{hsfang1981@yahoo.com.cn} ; Huihua Yi^a ; ^b ; ^c ; Chenglin Hu^a ; ^b ; ^c ; Bin Yang^a ; ^b ; ^c ; Yaochun Yao^a ; ^b ; ^c ; Wenhui Ma^a ; ^b ; ^c ; Yongnian Dai^a ; ^b ; ^c
• 关键词：Lithium ion batteries ; Cathode ; Lithium manganese phosphate ; Doping ; Zinc
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 June, 2012
• 卷：71
• 期：Complete
• 页码：266-269
• 文件大小：644 K

摘要

In this work, effect of Zn doping on the performance of LiMnPO₄ is revisited. Samples of pure and Zn-doped LiMnPO₄ are synthesized by a new solid-state method, and their structure, morphology and electrochemical behavior are characterized and compared. The results reveal that a small amount of Zn doping (2 at.%) is highly beneficial for the performance of LiMnPO₄ due to the reduced charge transfer resistance, the increased lithium ion diffusion and phase conversion, but this effect is remarkably traded off at a high level of Zn doping (10 at.%). Compared with LiMnPO₄, LiMn_0.98Zn_0.02PO₄ has a much higher capacity and a much better rate capability. After 2 at.%Zn doping, the discharge capacity increases from 101 to 139 mAh g^鈭? at 0.1 C and 56 to 105 mAh g^鈭? at 2 C.