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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Molding of Li5.5PS4.5Cl1.5 Particles Based on Regulating Li+ Transport for All-Solid-State Li Metal Battery
Guanwu Li1, Dong Wang1, Bo Gao1
1State Key Laboratory of High Pressure and Superhard Materials, and School of Materials Science and Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, and Electron Microscopy Center, and International Center of Future Science, Jilin University, Changchun, 130013, P. R. China.
All-solid-state Li metal batteries (ASSLBs) benefit from sulfide solid-state electrolytes (S-SSEs). Optimizing particle size distribution in S-SSEs enhances Li+ transport for stable, long-cycle ASSLBs.
Area of Science:
- Materials Science
- Electrochemistry
- Computational Modeling
Background:
- All-solid-state Li metal batteries (ASSLBs) utilize sulfide solid-state electrolytes (S-SSEs) for high Li+ conductivity.
- Irregular particle morphology and interfaces in S-SSEs disrupt Li+ flux, hindering performance with pure Li anodes.
- Mesoscopic structures of S-SSEs require advanced characterization beyond average particle size for effective Li+ flux analysis.
Purpose of the Study:
- To model and evaluate the impact of particle size distribution (number and consistency) on Li+ transfer and concentration uniformity in Li5.5PS4.5Cl1.5 (LPSC) based S-SSEs.
- To investigate the relationship between particle interfaces, Li+ transport, and ion flux.
- To design and validate a gradient particle size S-SSE for improved ASSLB performance.
Main Methods:
- Development of a computational model for LPSC particles, defining size by number (N) and consistency (σ).
- Machine learning analysis integrating simulation data (Li+ concentration vs. N and σ) with experimental results.
- Fabrication and testing of ASSLBs utilizing the designed gradient particle size S-SSE.
Main Results:
- Excessive interfaces impede Li+ transport, while irregular interfaces cause uneven ion flux.
- A particle size gradient S-SSE design was predicted to enable fast and uniform Li+ transport.
- ASSLBs with the gradient S-SSE achieved over 1000 hours of cycling with >80% capacity retention.
Conclusions:
- Adjusting LPSC particle morphology is crucial for achieving long cycle life in ASSLBs.
- Gradient particle size design effectively optimizes Li+ flux across the entire S-SSE.
- This approach offers a pathway to enhance the stability and performance of sulfide-based ASSLBs.
