Decoupling Lithium Reutilization Behavior under Different Discharge Rates for Anode-Free Lithium Metal Batteries
Shuo Zhang1,2, Chong Yan1,2, Ye Xiao1,2
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Advanced Materials (Deerfield Beach, Fla.)
|April 30, 2025
Summary
Anode-free lithium metal batteries (AFLMBs) show a "volcano-type" capacity retention at high discharge rates. Lowering concentration polarization by improving electrolyte performance enhances their optimal discharge rate and cycling stability.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Anode-free lithium metal batteries (AFLMBs) offer high energy density and safety, making them suitable for electric vehicles and aircraft.
- The performance limitations of AFLMBs at high discharge rates remain poorly understood.
Purpose of the Study:
- To investigate the underlying mechanisms limiting the fast discharge performance of AFLMBs.
- To propose strategies for overcoming these limitations and improving high-rate capabilities.
Main Methods:
- Systematic investigation of AFLMB performance across varying discharge rates.
- Analysis of lithium deposition morphology and concentration polarization.
- Electrolyte modification to enhance ion transport.
Main Results:
- A novel
Conclusions:
- Concentration polarization is the rate-determining step for high-rate discharge in AFLMBs.
- Optimizing electrolyte properties to reduce concentration polarization significantly improves discharge rate and cycling stability.
- This research expands the operational boundaries of AFLMBs under demanding conditions.
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