A pre-strain strategy for suppressing interfacial debonding in carbon fiber structural battery composites

  • Chuanxi HU ,
  • Bo LU ,
  • Yinhua BAO ,
  • Yicheng SONG ,
  • Junqian ZHANG
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  • 1.Shanghai Institute of Applied Mathematics and Mechanics, Shanghai 200072, China
    2.Department of Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China
    3.Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai 200072, China
Yicheng SONG, E-mail: ycsong@shu.edu.cn

Received date: 2025-04-14

  Revised date: 2025-07-25

  Online published: 2025-09-12

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 12172205, 12072183, 12102244, and 12472174)

Copyright

© Shanghai University 2025

Abstract

This study proposes a pre-strain optimization strategy for carbon fiber structural lithium-ion battery (SLIB) composites to inhibit the interfacial debonding between carbon fibers and solid-state electrolytes due to fiber lithiation. Through an analytical shear-lag model and finite element simulations, it is demonstrated that applying tensile pre-strain to carbon fibers before electrode assembly effectively reduces the interfacial shear stress, thereby suppressing debonding. However, the excessive pre-strain can induce the interfacial damage in the unlithiated state, necessitating careful control of the pre-strain within a feasible range. This range is influenced by electrode material properties and geometric parameters. Specifically, the electrodes with the higher solid-state electrolyte elastic modulus and larger electrolyte volume fraction exhibit more significant interfacial damage, making pre-strain application increasingly critical. However, these conditions also impose stricter constraints on the feasible pre-strain range. By elucidating the interplay between pre-strain, material properties, and geometric factors, this study provides valuable insights for optimizing the design of carbon fiber SLIBs.

Cite this article

Chuanxi HU , Bo LU , Yinhua BAO , Yicheng SONG , Junqian ZHANG . A pre-strain strategy for suppressing interfacial debonding in carbon fiber structural battery composites[J]. Applied Mathematics and Mechanics, 2025 , 46(9) : 1699 -1714 . DOI: 10.1007/s10483-025-3296-7

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