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Exceptional Rate Performances of Li-Rich Mn-Based Cathodes Enabled by Boron-Based Additives-Driven Self-Optimized
Kang Ma1, Yu Cao1, Shaojie Zhang1
1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
Nano Letters
|July 12, 2024
Summary
Boron-based additives improve Li-rich Mn-based cathode (LRM) performance by optimizing interfaces. This strategy enhances Li-ion transport, leading to stable, high-capacity lithium batteries with excellent rate capabilities.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Li-rich Mn-based cathode materials (LRM) offer high energy density for lithium batteries.
- LRMs exhibit poor stability and rate performance due to side reactions with LiPF6-based electrolytes, forming insulating LiF layers.
Purpose of the Study:
- To develop a self-optimized interface strategy using boron-based additives for LRM cathode materials.
- To enhance the electrochemical performance and cycle life of LRM-based lithium batteries.
Main Methods:
- Investigated the use of boron-based additives to modify the cathode-electrolyte interface.
- Analyzed the dissolution of LiF nanoparticles and the formation of optimized interfacial components.
- Evaluated Li-ion migration rates in the electrolyte.
Main Results:
- The boron-based additive strategy effectively dissolved low ionic conductivity LiF nanoparticles.
- Optimized interfacial components and enhanced Li-ion migration rates were observed.
- The LRM||Li battery demonstrated 92.19% capacity retention after 200 cycles at 1C and a low voltage decay of 1.08 mV/cycle.
Conclusions:
- Boron-based additives provide a self-optimized interface strategy for LRM cathodes.
- This approach significantly improves cycle stability and rate performance.
- The findings offer a new perspective for selecting functional additives for long-life, high-performance LRM batteries.
