孔结构对软碳负极储锂性能的影响

doi:10.19799/j.cnki.2095-4239.2022.0037

储能科学与技术 ›› 2022, Vol. 11 ›› Issue (7): 2023-2029.doi: 10.19799/j.cnki.2095-4239.2022.0037

孔结构对软碳负极储锂性能的影响

王宇作¹^,²(), 王瑨³, 卢颖莉², 阮殿波⁴^,⁵()

^1.天津大学化工学院，天津 300072
^2.宁波中车新能源科技有限公司，浙江宁波 315112
^3.成都佰思格科技有限公司，四川成都 610096
^4.宁波大学先进储能技术与装备研究院，浙江宁波 315211
^5.清华大学材料学院，北京 100084

收稿日期:2022-01-18 修回日期:2022-01-21 出版日期:2022-07-05 发布日期:2022-06-29
通讯作者: 阮殿波 E-mail:396755221@qq.com;ruandianbo@nbu.edu.cn
作者简介:王宇作（1990—），男，博士，研究方向为电化学储能，E-mail：396755221@qq.com；
基金资助:
轨道交通车辆制动能量回馈关键技术(2019B10045)

Study on the effects of pore structure on lithium-storage performances for soft carbon

Yuzuo WANG¹^,²(), Jin WANG³, Yinli LU², Dianbo RUAN⁴^,⁵()

^1.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
^2.Ningbo CRRC New Energy Technology Co. Ltd. , Ningbo 315112, Zhejiang, China
^3.Chengdu Baisige Technology Co. Ltd. , Chengdu 610096, Sichuan, China
^4.Advanced Research Institute for Energy Storage Technology and Equipment, Ningbo University, Ningbo 315211, Zhejiang, China
^5.School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received:2022-01-18 Revised:2022-01-21 Online:2022-07-05 Published:2022-06-29
Contact: Dianbo RUAN E-mail:396755221@qq.com;ruandianbo@nbu.edu.cn

摘要/Abstract

摘要：

软碳具有倍率性能好、储锂容量高、与电解液相容性好等优点，是快充型锂离子电池理想的负极材料。通过造孔处理可以进一步提高软碳的储锂能力，增加其可逆容量，但目前缺少对孔结构与其电化学性能相关性的系统性研究。因此，本论文通过对软碳前驱体材料进行优选，分别以锦州针状焦和日本JEF针状焦为原材料，制备了具有不同孔结构的软碳材料，并通过扫描电子显微镜(SEM)、X射线衍射(XRD)、激光拉曼光谱(Raman)及氮气等温吸附等表征手段，解析了两者微观结构的差异性。同时，采用循环伏安(CV)、恒流充放电(GCPL)、交流阻抗(EIS)及电化学滴定(GITT)等电化学分析方法，研究了孔径分布对软碳电化学性能的影响。结果表明，软碳中的微孔对其首次循环过程的不可逆容量贡献较小。当软碳中存在适量的微孔(63%)时，可以在不对其首次库仑效率及循环稳定性产生影响的情况下，增加吸附反应机制的容量贡献，并提高储锂过程的反应动力学，从而达到较高的可逆容量及倍率性能。

关键词: 锂离子电池, 负极, 软碳, 微孔, 储锂性能

Abstract:

Soft carbon is an ideal anode material for fast-charging lithium-ion battery which has the high rate-performance, high reversible capacity, and good compatibility with electrolytes. It has been discovered that soft carbon's electrochemical performances can be further enhanced by pore-making treatment, but a systematic study on the relationship between pore structure and electrochemical performance is still absent. Thus, in this study, soft carbon materials with various pore structures were prepared using the various precursor materials, including Jinzhou and JEF needle coke. The SEM, XRD, Raman, and N₂ isothermal adsorption were employed to examine the changes in microstructure for as-obtained soft carbon materials; The CV, GCPL, EIS, and GITT were employed to examine the effect of pore size distribution on their electrochemical performance. It was discovered that the micropores in soft carbon contributed less to the irreversible capacity during first cycling. When there are suitable micropores (63%) in soft carbon, the lithium-storage capacity and kinetics can be improved without sacrificing the Coulombic efficiency and cycling stability, therefore attaining both high capacity and rate performance.

Key words: lithium-ion battery, anode, soft carbon, micropore, lithium-storage performance

中图分类号:

TM 911

王宇作, 王瑨, 卢颖莉, 阮殿波. 孔结构对软碳负极储锂性能的影响[J]. 储能科学与技术, 2022, 11(7): 2023-2029.

Yuzuo WANG, Jin WANG, Yinli LU, Dianbo RUAN. Study on the effects of pore structure on lithium-storage performances for soft carbon[J]. Energy Storage Science and Technology, 2022, 11(7): 2023-2029.

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孔结构对软碳负极储锂性能的影响

Study on the effects of pore structure on lithium-storage performances for soft carbon

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