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Simultaneously Modulating Li+ Transport Kinetics and Structural Stability in Li-Rich Mn-Based All-Solid-State
Shuang Peng1,2, Haonan Zheng1,2, Kaiqi Bu2
1School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, Guizhou, China.
Chemsuschem
|June 3, 2025
Summary
Optimizing particle size in Li-rich Mn-based oxides (LRMOs) is key for all-solid-state lithium batteries (ASSLBs). Dual-scale particle engineering balances Li+ transport and interfacial stability, enhancing battery performance and longevity.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Li-rich Mn-based oxides (LRMOs) offer high theoretical capacity for all-solid-state lithium batteries (ASSLBs).
- Sluggish Li+ transport and interfacial instability limit the practical application of LRMOs in ASSLBs.
Purpose of the Study:
- To investigate the critical role of primary and secondary particle sizes in LRMOs on Li+ transport kinetics and interfacial stability.
- To identify optimal particle size parameters for enhanced LRMO performance in ASSLBs.
Main Methods:
- Systematic variation of primary and secondary particle sizes in LRMO cathode materials.
- Electrochemical performance testing, including capacity, rate capability, and cycling stability.
- Analysis of Li+ transport pathways and interfacial phenomena.
Main Results:
- Large secondary particles (≈10 μm) impede Li+ transport and cause cracks.
- Excessively small secondary particles (≈1 μm) lead to poor interface contact and oxygen release, causing phase transformation.
- An optimal secondary particle size (≈5 μm) and increased primary particle size (≈0.46 μm) balance transport efficiency and interfacial integrity.
- Achieved 200.2 mAh g⁻¹ at 0.05 C and 67.4% retention after 500 cycles at 0.3 C.
Conclusions:
- Dual-scale particle engineering of LRMOs is crucial for overcoming limitations in ASSLBs.
- Optimized particle sizes enhance Li+ kinetics and interfacial stability, leading to superior electrochemical performance.
- This study provides a pathway for designing advanced cathode materials for next-generation solid-state batteries.
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