622型三元正极材料的制备及其电化学性能

doi:10.12028/j.issn.2095-4239.2018.0112

储能科学与技术 ›› 2018, Vol. 7 ›› Issue (5): 921-925.doi: 10.12028/j.issn.2095-4239.2018.0112

622型三元正极材料的制备及其电化学性能

夏志美, 陈浩, 肖利, 刘鹏程

湖南工业大学冶金与材料工程学院, 湖南株洲 412007

收稿日期:2018-07-02 修回日期:2018-08-02 出版日期:2018-09-01 发布日期:2018-09-01
通讯作者: 肖利,教授,研究方向为电化学冶金,E-mail:xiaoli_csu@163.com
作者简介:夏志美(1980-),女,讲师,研究方向为湿法冶金和电化学冶金,E-mail:zhimei_x@163.com
基金资助:
国家自然科学基金（51774127，51704107），湖南省自然科学基金（2018JJ2091，2018JJ3124）及湖南省重点实验室开放基金（MMA201705）项目。

Preparation and electrochemical performance of a type 622 ternary cathode materials

XIA Zhimei, CHEN Hao, XIAO Li, LIU Pengcheng

College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, Hunan, China

Received:2018-07-02 Revised:2018-08-02 Online:2018-09-01 Published:2018-09-01
Contact: 10.12028/j.issn.2095-4239.2018.0112

摘要/Abstract

摘要： 将622型前驱体与0.24 Li₂CO₃-0.76 LiOH锂盐体系、氯化钾熔盐混合，在通空气气氛中采用熔盐法制备了622型三元电池正极材料（LNCM），采用XRD和SEM表征考察了锂源和钾盐的比例及焙烧温度和时间对LNCM晶体结构的影响，得出最佳制备条件为：锂源与钾盐1：5，前驱体和锂源1：1.1，焙烧温度为750℃，焙烧时间为15 h。将LNCM作为正极材料组装成扣式电池，对其进行了多项电化学性能指标测试，结果表明该材料在2.7~4.3 V内，0.1 C放电倍率下，具有182.5 mA·h/g首次放电容量，库仑效率为89.1%；在2.7~4.5 V，0.1 C条件下循环100圈后容量仍有183.2 mA·h/g，容量保持率为91.5%。

关键词: 622型前驱体, LNCM, 熔盐法, 晶体结构, 电化学性能

Abstract: A 622-type ternary cathode materials (LNCM) was prepared by using molten salt made from a lithium salt based type-622 precursor, 0.24 Li₂CO₃-0.76 LiOH and potassium chloride in an air atmosphere. The effects of the ratio of lithium and potash, reaction time and reaction temperature on the crystal structure of the LNCM were investigated by XRD and SEM. The optimum preparation conditions were found to be from a lithium source to potassium salt ration of 1:5, a precursor to lithium source ratio of 1:1.1, a reaction temperature of 750℃, and a calcination time of 15 hours. LNCM as a cathode material was assembled into a button battery, and a number of electrochemical performance indexes were obtained, e.g. over the 2.7-4.3 V voltage range at 0.1 C rate, the specific capacity of the first discharge cycle was 182.5 mA·h/g, the Coulomb efficiency was 89.1%; over the 2.7-4.5 V voltage range at 0.1 C rate, the discharge specific capacity was 183.2 mA·h/g after 100 cycles, the capacity retention rate was found to be 91.5%.

Key words: 622 type precursor, LNCM, molten salt method, crystal structure, electrochemical performance

中图分类号:

TM911

夏志美, 陈浩, 肖利, 刘鹏程. 622型三元正极材料的制备及其电化学性能[J]. 储能科学与技术, 2018, 7(5): 921-925.

XIA Zhimei, CHEN Hao, XIAO Li, LIU Pengcheng. Preparation and electrochemical performance of a type 622 ternary cathode materials[J]. Energy Storage Science and Technology, 2018, 7(5): 921-925.

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622型三元正极材料的制备及其电化学性能

Preparation and electrochemical performance of a type 622 ternary cathode materials

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