Applied Mathematics and Mechanics >
A pre-strain strategy for suppressing interfacial debonding in carbon fiber structural battery composites
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
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.
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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