氧化硼修饰的钴酸锂材料及其电化学性能

doi:10.19799/j.cnki.2095-4239.2021.0685

储能科学与技术 ›› 2022, Vol. 11 ›› Issue (6): 1687-1692.doi: 10.19799/j.cnki.2095-4239.2021.0685

氧化硼修饰的钴酸锂材料及其电化学性能

武怿达¹(), 张义¹, 詹元杰¹, 郭亚奇¹, 张辽¹, 刘兴江², 俞海龙³, 赵文武³, 黄学杰¹^,³()

^1.松山湖材料实验室，广东东莞 523000
^2.中国电子科技集团公司第十八研究所，天津 300384
^3.中国科学院物理研究所，北京 100190

收稿日期:2021-12-20 修回日期:2022-01-10 出版日期:2022-06-05 发布日期:2022-06-13
通讯作者: 黄学杰 E-mail:wuyida@sslab.org.cn;xjhuang@iphy.ac.cn
作者简介:武怿达（1992—），男，博士，研究方向为高电压锂离子电池正极材料和电池技术研究，E-mail：wuyida@sslab.org.cn；
基金资助:
中科院重点部署项目(ZDRW_CN_ 2020-1)

The effect of B₂O₃ modification on the electrochemical properties of LiCoO₂ cathode

WU Yida¹(), ZHANG Yi¹, ZHAN Yuanjie¹, GUO Yaqi¹, ZHANG liao¹, LIU Xingjiang², YU Hailong³, ZHAO Wenwu³, HUANG Xuejie¹^,³()

^1.Songshan Lake Materials Laboratory, Dongguan 523000, Guangdong, China
^2.The 18th China Electronics Technology Group Corporation, Tianjin 300384, China
^3.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2021-12-20 Revised:2022-01-10 Online:2022-06-05 Published:2022-06-13
Contact: HUANG Xuejie E-mail:wuyida@sslab.org.cn;xjhuang@iphy.ac.cn

摘要/Abstract

摘要：

钴酸锂材料由于具有高的能量密度、优异的倍率性能和热稳定性被广泛应用于各种消费类电子产品，随着人工智能和5G时代的到来，人们对钴酸锂电池的能量密度有了更高的需求。本研究通过利用简单的固相法对钴酸锂进行硼化物包覆，经过改性后的钴酸锂材料(BLCO)相比于未改性的原始材料(LCO)电阻率下降一个数量级，该材料组装成的电池在常温下3～4.55 V的初始容量达到201.2 mAh/g，高于原始钴酸锂材料的192.64 mAh/g，循环500周后容量为194.8 mAh/g，高于原始材料的184.37 mAh/g。这种提升是由于硼化物改性后的钴酸锂材料具有更高的电子电导率和更小的界面阻抗，本工作提供了一种提升高电压钴酸锂材料容量的方法并对高电压下钴酸锂材料的失效机制进行了初步分析，对未来高容量钴酸锂材料的设计具有较大参考意义。

关键词: 锂离子电池, 钴酸锂, 包覆, 氧化硼, 高电压

Abstract:

Lithium cobalt oxide is widely employed in different consumer electronic products due to its high energy density, rate performance, and thermal stability. With the advancement of artificial intelligence and 5G communication technology. A higher energy density of LiCoO₂ (LCO) batteries is required. In this study, lithium cobalt oxide was coated with B₂O₃ using the simple solid-state approach. The resistance of B₂O₃modified LiCoO₂ (BLCO) was much lower than the pristine LiCoO₂ (LCO). The discharge capacity of BLCO at 3-4.55 V and room temperature reach 201.2 mAh/g, which was greater than 192.64 mAh/g of the pure LCO. The capacity retention of BLCO after 500 cycles was 194.8 mAh/g, which was higher than 184.37 mAh/g of the pristine LCO. This enhancement can be attributed to the higher electronic conductivity and smaller interface impedance of BLCO. Our research provides a method to enhance the capacity of lithium cobalt oxide. The failure mechanism of lithium cobalt oxide material cycled at high voltage was also investigated, which will be helpful for the design of high voltage lithium cobalt oxide in the future.

Key words: lithium battery, LiCoO₂, coating, B₂O₃, high voltage

中图分类号:

TM 911

武怿达, 张义, 詹元杰, 郭亚奇, 张辽, 刘兴江, 俞海龙, 赵文武, 黄学杰. 氧化硼修饰的钴酸锂材料及其电化学性能[J]. 储能科学与技术, 2022, 11(6): 1687-1692.

WU Yida, ZHANG Yi, ZHAN Yuanjie, GUO Yaqi, ZHANG liao, LIU Xingjiang, YU Hailong, ZHAO Wenwu, HUANG Xuejie. The effect of B₂O₃ modification on the electrochemical properties of LiCoO₂ cathode[J]. Energy Storage Science and Technology, 2022, 11(6): 1687-1692.

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测试类型		LCO	BLCO
激光粒度/μm	D10	4.76	4.86
	D50	13.80	13.63
	D90	28.37	26.20
	Dmax	41.63	36.73
粉体电阻率(2MPa)/(kΩ/cm)		512.591	32.1538
振实密度/(g/cm³)		3.09	3.02

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氧化硼修饰的钴酸锂材料及其电化学性能

The effect of B₂O₃ modification on the electrochemical properties of LiCoO₂ cathode

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The effect of B₂O₃ modification on the electrochemical properties of LiCoO₂ cathode