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Lithium-Air Batteries: Air-Electrochemistry and Anode Stabilization
Kai Chen1,2, Dong-Yue Yang1,2, Gang Huang1
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
Accounts of Chemical Research
|January 15, 2021
Summary
Researchers are optimizing lithium-air batteries for higher energy density, focusing on stable electrolytes, advanced air electrodes, and protected lithium anodes. This progress aims to overcome current limitations and pave the way for next-generation energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Current lithium-ion batteries face limitations in energy density.
- Lithium-air batteries offer significantly higher energy density (3500 Wh/kg) but face challenges.
- Key challenges include electrolyte instability, cathode passivation, and lithium anode corrosion.
Purpose of the Study:
- To summarize a decade of progress in optimizing lithium-air battery performance.
- To address fundamental and application-related bottleneck problems.
- To guide future research towards commercialization.
Main Methods:
- Investigated stable electrolyte development for lithium-air batteries.
- Engineered air electrodes, including carbon-based and all-metal cathodes.
- Explored anode protection strategies: artificial films, hydrophobic electrolytes, additives, and alloy anodes.
- Studied the electro-activity of N2 and the role of CO2 in Li-O2/CO2 systems.
Main Results:
- Identified suitable electrolytes, enabling breakthroughs in reaction mechanism understanding and performance.
- Developed design principles for air electrodes, enhancing overall battery function.
- Demonstrated effective anode protection methods to mitigate corrosion and side reactions.
- Clarified the influence of air components like N2 and CO2 on battery performance.
Conclusions:
- Simultaneous optimization of electrolytes, cathodes, and anodes is crucial for high-performance lithium-air batteries.
- Continued research in air-electrochemistry and anode protection is essential.
- Cell-level optimization and consideration of application scenarios are vital for commercialization.
