化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (8) : 176-181. DOI: 10.19817/j.cnki.issn1006-3536.2022.08.034

科学研究

尖晶石型LiNi_yZn_0.02Mn_1.98-yO₄(y≤0.10)正极材料的简易制备及其电化学性能

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Simple preparation and electrochemical property of spinel LiNi_yZn_0.02Mn_1.98-yO₄(y≤0.10) cathode material

Chen Yanqiu^1,2, Liang Linqiao^1,2, Liu Haiyang^1,2, Guo Junming^1,2, Bai Wei^1,2, Xiang Mingwu^1,2

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Received
2021-04-27
Issue Date	Revised Date
2022-08-29	2021-04-27

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摘要

采用固相燃烧法快速合成Ni-Zn双掺杂的LiNi_yZn_0.02Mn_1.98-yO₄正极材料。结果表明:所有制备材料的晶体结构与尖晶石型LiMn₂O₄一致,且无任何杂相生成;随着Ni掺杂量的增加,材料的粒径逐渐减小,结晶性增强。通过恒电流充放电测试对各种LiNi_yZn_0.02Mn_1.98-yO₄正极材料进行电化学性能研究,其中,LiNi_0.03Zn_0.02Mn_1.95O₄具有良好的电化学性能,在1C倍率可释放114.3mAh/g的首次放电容量,1000次循环后,保持66.8mAh/g的可逆容量,在5C的较高倍率,其首次放电容量也高达109.6mA/g,同样可实现1000次的长循环。

Abstract

The Ni-Zn co-doped LiNi_yZn_0.02Mn_1.98-yO₄ cathode materials were rapidly synthesized by solid phase combustion method.Results shown that the crystal structure of all the as-prepared materials corresponded to the spinel LiMn₂O₄,and there was no any impurity.The particle size decreased and crystallization increased with the increase of Ni-doping content.The electrochemical performance of various LiNi_yZn_0.02Mn_1.98-yO₄ cathode materials was studied by galvanostatic charge-discharge test.Among them,the LiNi_0.03Zn_0.02Mn_1.95O₄ had good electrochemical performance with the first discharge capacity of 114.3mAh/g,and maintained the reversible capacity of 66.8mAh/g at 1C after 1000 cycles.At the high current rate of 5C,the initial discharge capacity was as high as 109.6mAh/g,and achieved long cycle of 1000 cycles.

关键词

锂离子电池 / LiMn₂O₄ / Ni-Zn双掺杂 / 正极材料 / 固相燃烧法

Key words

lithium ion battery / LiMn₂O₄ / Ni-Zn dual-doping / cathode material / solid phase combustion method

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尖晶石型LiNi_yZn_0.02Mn_1.98-yO₄(y≤0.10)正极材料的简易制备及其电化学性能[J]. 化工新型材料, 2022, 50(8): 176-181 DOI:10.19817/j.cnki.issn1006-3536.2022.08.034

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