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Cavity-Engineered Polycrystalline Cathodes Resolve Stress Concentration Problem in All-Solid-State Lithium Metal
Tianpeng Huang1,2,3,4, Yue Zheng1,3,4,5, Jun Ma1,3,4
1Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China.
Advanced Materials (Deerfield Beach, Fla.)
|March 27, 2026
Summary
Designing cavity-contained cathode particles in all-solid-state lithium metal batteries (ASSLMBs) effectively manages stress concentration. This innovation enhances battery cycling stability and longevity by improving mechanical and electrochemical performance across multiple scales.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- All-solid-state lithium metal batteries (ASSLMBs) offer higher energy density than liquid systems.
- Stress concentration in polycrystalline (PC) Ni-rich cathode materials is a major, poorly understood cause of ASSLMB degradation.
- Existing cathode designs struggle to mitigate multiscale mechanical-electrochemical degradation.
Purpose of the Study:
- To design and investigate cavity-contained PC LiNi0.9Co0.05Mn0.05O2 (NCM) cathode particles for bottom-up stress management.
- To elucidate the mechanisms of stress concentration and degradation in ASSLMBs at the particle-electrode-battery multiscale.
- To improve the cycling stability and lifespan of ASSLMBs through tailored cathode particle architecture.
Main Methods:
- Design of central-cavity NCM cathode particles for stress mitigation.
- Synchrotron X-ray tomography to analyze material structure and degradation.
- Multiscale finite element simulations to model mechanical-electrochemical behavior.
- Electrochemical cycling tests to evaluate battery performance.
Main Results:
- Central-cavity NCM particles suppressed internal cracking by shortening ion transport and providing stress-relief space.
- Enhanced uniformity in cathode (de)lithiation, reduced electrolyte porosity/fracture, and inhibited anode lithium dendrite formation were observed.
- ASSLMBs with central-cavity NCM showed superior cycling stability (86.4% after 200 cycles, 81.5% after 400 cycles) compared to cavity-free and single-crystal NCM.
Conclusions:
- Cathode reaction heterogeneity drives multiscale mechanical-electrochemical degradation in ASSLMBs.
- Central-cavity NCM design effectively manages stress concentration across particle-electrode-battery scales.
- This approach offers a holistic strategy for designing long-lifespan ASSLMBs.
