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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Research on mechano-diffusional coupling of nanoscale hollow cylindrical electrode

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空心纳米柱状电极力-扩散耦合行为研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jul.2023, Vol.46 No.7: 950-956

DOI: 10.3969/j.issn.1003-5060.2023.07.014

Authors

LI Guangming, ZHAN Chunxiao, LI Xiaobao

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In this paper, the mechanical and ionic diffusion behaviors of a nanoscale hollow cylindrical ionic battery electrode under surface effect and external load were investigated by establishing a mechano-diffusional coupling theoretical model. The surface effect was taken into account in the proposed model. The influence and mechanism of surface effect and size effect on the distribution of ionic concentration and stress field was explored for the electrode under potentiostatic operation. It is found that the surface effect on tangential and axial stress is more prominent for the electrode with a smaller size, and the stress is a compressive one. The surface effect on radial stress is dependent on the position of the electrode. This study can provide theoretical basis and reference for the optimization of mechano-diffusional coupling properties of nanoscale hollow cylindrical electrodes and their application.

Keywords: lithium ion; nanoscale electrode; mechano-diffusional coupling model; surface effect; potentiostatic operation

作者信息

李广明，詹春晓，李孝宝

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 文章以纳米尺度离子电池的电极结构为研究对象, 建立可考虑表面效应的力-扩散双向耦合理论模型, 对其在表面效应和外部载荷作用下的力学响应行为进行系统研究。借助建立的理论模型, 研究尺寸效应、表面效应等对恒电压充电条件下空心纳米柱状电极中浓度场、应力场分布规律的影响并分析其内在机制。研究发现在该文条件下, 表面效应对电极中环向和轴向应力场有压应力作用, 且尺寸越小压应力作用越明显, 而对径向应力场的作用则与位置有关。该研究为优化空心纳米柱状电极中的力-扩散耦合行为性能及应用拓展提供了一定的理论基础和参考依据。

关键词: 锂离子；纳米电极；力-扩散耦合模型；表面效应；恒电压充电

Funding

江苏省工程力学分析重点实验室开放课题资助项目(LEM21A01); 中央高校基本科研业务费专项资金资助项目(LEM21A01)

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