热处理时间对锂电池正极材料Cr8O21的影响

doi:10.13208/j.electrochem.210121

电化学（中英文） ›› 2021, Vol. 27 ›› Issue (6): 689-697. doi: 10.13208/j.electrochem.210121

热处理时间对锂电池正极材料Cr₈O₂₁的影响

滕久康¹, 王庆杰¹^,^*(), 张亮¹, 张红梅¹, 陈晓涛¹, 张鹏², 赵金保²^,³

1.贵州梅岭电源有限公司,特种化学电源国家重点实验室,贵州遵义 563003
2.厦门大学能源学院,福建厦门361102
3.厦门大学化学化工学院,固体表面物理化学国家重点实验室,新能源汽车动力电源技术国家地方联合工程实验室,福建厦门 361005

收稿日期:2021-01-25 修回日期:2021-04-14 出版日期:2021-12-28 发布日期:2021-05-04
通讯作者: 王庆杰 E-mail:wqj3401@163.com
基金资助:
贵州省科技计划项目(20202Y057)

Influence of Heat Treatment Time on Cathode Material Cr₈O₂₁ for Lithium Battery

Jiu-Kang Teng¹, Qing-Jie Wang¹^,^*(), Liang Zhang¹, Hong-Mei Zhang¹, Xiao-Tao Chen¹, Peng Zhang², Jin-Bao Zhao²^,³

1. Guizhou Meiling Power Sources Co. Ltd, State Key Laboratory of Advanced Chemical Power Sources,Zunyi 563003, Guizhou, China
2. College of Energy & School of Energy Research, Xiamen University,Xiamen 361102, Fujian, China
3. State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Centre of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, Engineering Research Center of Electrochemical Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China

Received:2021-01-25 Revised:2021-04-14 Published:2021-12-28 Online:2021-05-04
Contact: Qing-Jie Wang E-mail:wqj3401@163.com

摘要/Abstract

摘要：

本文以CrO₃为原料,采用高温固相法制备锂电池用正极材料Cr₈O₂₁,系统研究了热处理时间对Cr₈O₂₁结构、电化学性能的影响。采用TGA、XRD、SEM、EDS、ICP、EIS和恒流放电技术对制备的铬氧化物的物相及电化学性能进行研究。结果表明,延长热处理时间有利于提升材料的电化学性能。且不同的热处理时间对材料的电化学性能有重要影响。热处理时间为48 h得到的材料性能优异,在恒放电电流0.05 mA下,材料克比容量达到383.26 mAh·g^-1,克比能量达到1153.83 mWh·g^-1,平均放电电压3.01 V。

关键词: 锂电池, 正极材料, Cr₈O₂₁, 铬氧化物, 热处理时间

Abstract:

Chromium oxide (Cr₈O₂₁) cathode material for lithium batteries was synthesized by thermal decomposition of chromium trioxide (CrO₃) at high temperature. The electrochemical properties of chromium oxide depended on the time and temperature during the heat treatment. Pure phase chromium oxide was prepared, and the effects of heat treatment time on the structures and electrochemical properties of Cr₈O₂₁ were systematically studied. The first discharge mechanism of chromium oxide in lithium batteries was explored, and the results were similar to that in lithium-sulfur batteries. The crystal phases and electrochemical properties of the prepared chromium oxide were analyzed by TGA, XRD, SEM, EDS, ICP, EIS techniques and constant current discharge measurement. The results show that heat treatment time had an important impact. Extending the heat treatment time was beneficial to improve the electrochemical properties of the material. The less the amount of residual CrO₃, the better the electrochemical performance. The severe oxidation reaction between CrO₃ and the electrolyte caused the electrode to be corroded. The material obtained in 48 h exhibited excellent performance, complete crystallization, good morphology, and low electrochemical impedance. At a constant discharge current of 0.05 mA, the specific capacity of the material reached 383.26 mAh·g^-1 with the specific energy of 1153.83 mWh·g^-1 and the average discharge voltage of 3.01 V. This study provides an effective way to prepare pure phase chromium oxide and proves its potential application in the field of lithium batteries.

Key words: lithium battery, cathode material, Cr₈O₂₁, chromium oxide, heat treatment time

滕久康, 王庆杰, 张亮, 张红梅, 陈晓涛, 张鹏, 赵金保. 热处理时间对锂电池正极材料Cr₈O₂₁的影响[J]. 电化学（中英文）, 2021, 27(6): 689-697.

Jiu-Kang Teng, Qing-Jie Wang, Liang Zhang, Hong-Mei Zhang, Xiao-Tao Chen, Peng Zhang, Jin-Bao Zhao. Influence of Heat Treatment Time on Cathode Material Cr₈O₂₁ for Lithium Battery[J]. Journal of Electrochemistry, 2021, 27(6): 689-697.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.210121

https://electrochem.xmu.edu.cn/CN/Y2021/V27/I6/689

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参考文献 14

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Material number	Heating temperature/°C	Heating time/h
A-2	270	2
A-6	270	6
A-12	270	12
A-24	270	24
A-48	270	48

Element	Atomic percent/%	Mass percent/%
Cr	27.9	55.59
O	72.1	44.41

Material number	Specific capacity/(mAh·g^-1)	Specific energy/(mWh·g^-1)	Average voltage/V
A-2	256.67	765.67	2.97
A-6	271.26	812.86	3.00
A-12	304.28	919.04	3.00
A-24	352.90	1074.71	3.00
A-48	383.26	1153.83	3.01

Material number	Specific capacity/(mAh·g^-1)	Specific energy/(mWh·g^-1)	Average voltage/V
A-2	246.50	729.64	3.02
A-6	243.17	715.26	2.99
A-12	283.03	839.97	2.98
A-24	340.91	994.99	2.95
A-48	346.17	1017.86	2.95

Material number	Specific capacity/(mAh·g^-1)	Average voltage/V
A-2	207.73	2.90
A-6	222.01	2.86
A-12	258.43	2.85
A-24	252.72	2.89
A-48	280.32	2.82

热处理时间对锂电池正极材料Cr₈O₂₁的影响

Influence of Heat Treatment Time on Cathode Material Cr₈O₂₁ for Lithium Battery

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Metrics

Material number	Specific capacity/(mAh·g^-1)	Average voltage/V
A-2	92.75	2.64
A-6	144.23	2.79
A-12	183.30	2.70
A-24	213.18	2.77
A-48	227.32	2.76

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