多晶型MnO2改善富锂锰基正极材料的电化学性能

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (9): 3387-3394.

多晶型MnO₂改善富锂锰基正极材料的电化学性能

袁仲纯, 李佳, 姚梦琴, 刘飞, 马俊, 耿硕

贵州大学化学与化工学院,贵阳 550000

收稿日期:2023-04-06 修订日期:2023-06-19 出版日期:2023-09-15 发布日期:2023-09-14
通信作者: 刘飞,博士,教授。E-mail:ce.feiliu@gzu.edu.cn
姚梦琴,博士,讲师。E-mail:mqyao@gzu.edu.cn
作者简介:袁仲纯(1999—),女,硕士研究生。主要从事多晶型MnO₂的研究。E-mail:yzc3794@163.com
基金资助:
铜仁市科技局科技支撑计划([2021]16);贵州能矿锰业集团有限公司产学研合作项目;贵州大学实验室开放项目(SYSKF2023-041)

Electrochemical Performance of Lithium-Rich Manganese-Based Cathode Materials Improved by Polymorphic MnO₂

YUAN Zhongchun, LI Jia, YAO Mengqin, LIU Fei, MA Jun, GENG Shuo

School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550000, China

Received:2023-04-06 Revised:2023-06-19 Online:2023-09-15 Published:2023-09-14

摘要/Abstract

摘要： 富锂锰基正极材料由于具有较高的理论比容量,被认为是下一代锂电池最有前途的正极材料之一。但在循环过程中存在比容量低、倍率性能差、衰减速度快等问题。基于此,本文采用水热法制备了多晶型MnO₂材料,并利用湿化学研磨法结合热处理工艺对商业富锂锰基正极材料进行了表面包覆改性。通过循环伏安、恒流充放电及电化学阻抗谱对所得材料进行电化学性能测试,并通过包覆前后材料电化学性能的变化研究了多晶型MnO₂对富锂锰基正极材料电化学性能的影响。结果表明,β-MnO₂的电化学性能最佳,其初始比容量在0.1 C下达到292.2 mAh·g^-1,在0.1~5.0 C的倍率下容量保持率为56.3%,在1 C下循环50次后容量保持率为81.6%。通过EIS测试得出β-MnO₂的包覆改善了原样品电化学反应过程中的电化学动力学。

关键词: 多晶型MnO₂, 形貌调控, 表面包覆, 富锂锰基正极材料, 电化学性能, 锂离子电池

Abstract: Lithium-rich manganese-based cathode materials are known as one of the most promising cathode materials for next-generation lithium batteries due to their high theoretical specific capacity. However, there are problems in the cycle process, such as low specific capacity, poor magnification performance, and fast decay rate. Based on this, polymorphic MnO₂ materials were prepared by hydrothermal method, and the lithium-rich manganese-based cathode materials were modified of surface coating by wet chemical grinding combined and heat treatment. Electrochemical performance of the obtained materials was tested by cyclic voltammetry, constant current charge and discharge and electrochemical impedance spectroscopy, and the effect of polymorphic MnO₂ on electrochemical performance of lithium-rich manganese-based cathode materials was studied by the changes of electrochemical performances of the materials before and after coating. The results show that β-coated has the best electrochemical performance, and its initial specific capacity reaches 292.2 mAh·g^-1 at 0.1 C, the capacity retention rate is 56.3% at 0.1~5.0 C, and the capacity retention rate is 81.6% at 1 C for 50 times cycles. The coating of β-MnO₂ by EIS test improves electrochemical kinetics of original sample during the electrochemical reaction.

Key words: polymorphic MnO₂, morphology control, surface coating, lithium-rich manganese-based cathode material, electrochemical performance, lithium-ion battery

中图分类号:

TM912

袁仲纯, 李佳, 姚梦琴, 刘飞, 马俊, 耿硕. 多晶型MnO₂改善富锂锰基正极材料的电化学性能[J]. 硅酸盐通报, 2023, 42(9): 3387-3394.

YUAN Zhongchun, LI Jia, YAO Mengqin, LIU Fei, MA Jun, GENG Shuo. Electrochemical Performance of Lithium-Rich Manganese-Based Cathode Materials Improved by Polymorphic MnO₂[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3387-3394.

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多晶型MnO₂改善富锂锰基正极材料的电化学性能

Electrochemical Performance of Lithium-Rich Manganese-Based Cathode Materials Improved by Polymorphic MnO₂

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