化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (4) : 112-115. DOI: 10.19817/j.cnki.issn1006-3536.2021.04.024

新材料与新技术

微波辅助液相燃烧法制备钼掺杂LiMn₂O₄正极材料研究

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Preparation of Mo-doped LiMn₂O₄ cathode material by microwave-assisted liquid phase combustion

Wen Bixia^1,2, Chen Ruifang^1,2, Tian Liang^1,2, Su Changwei^1,2, Guo Junming^1,2

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Received
2019-12-09
Issue Date	Revised Date
2021-05-07	2019-12-09

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摘要

采用微波辅助液相燃烧法制备了一系列LiMo_xMn_2-xO₄(x=0,0.01,0.03,0.05)正极材料,通过XRD、SEM、CV等表征分析了材料的晶体结构、微观形貌和电化学性能。XRD和SEM数据表明,掺杂钼不会改变尖晶石型锰酸锂的结构,但能够提高材料的结晶性,掺杂钼后的样品颗粒分散均匀,形状更为规整。电化学性能测试结果表明,x=0.01时,样品的性能最佳,在室温、1C的放电条件下,LiMo_0.01Mn_1.99O₄的首次放电比容量可达116.9mAh/g,高于纯锰酸锂的首次放电比容量(108mAh/g)。由此可见,适量钼的掺杂能够改善锰酸锂材料的结晶性,并提高材料的首次放电比容量。

Abstract

A series of LiMo_xMn_2-xO₄(x=0,0.01,0.03,0.05) cathode materials were successfully prepared by microwave-assisted liquid phase combustion method.The crystal structure,microstructure and electrochemical performance of the materials were analyzed by XRD,SEM and CV.The XRD and SEM data shown that doping molybdenum did not change the structure of spinel LiMn₂O₄,and it can improve the crystallinity of the material.The Mo-doped sample particles were uniformly dispersed and the shape was more regular.The electrochemical performance test results shown that the sample was best when x=0.01.At room temperature and 1C discharge,the first discharge specific capacity of LiMo_0.01Mn_1.99O₄ can reach 116.9mAh/g,which was higher than pure LiMn₂O₄ of was only 108mAh/g.Therefore,the Mo doping with appropriate amount can improve the crystallinity of the LiMn₂O₄ material,and provided the first discharge specific capacity of the material.

关键词

锰酸锂 / 钼掺杂 / 锂离子电池 / 微波

Key words

LiMn₂O₄ / molybdenum dopping / lithium ion battery / microwave

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微波辅助液相燃烧法制备钼掺杂LiMn₂O₄正极材料研究[J]. 化工新型材料, 2021, 49(4): 112-115 DOI:10.19817/j.cnki.issn1006-3536.2021.04.024

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