Breakthrough in Lithium Metal Batteries: A Promising Approach for Low-Temperature and High-Voltage Performance

Researchers at the Changchun University of Technology have made a significant discovery in the development of rechargeable lithium metal batteries (LMBs). The team has designed a locally high-concentration electrolyte based on methyl acetate, which significantly improves the stability and performance of LMBs at low temperatures. The innovative electrolyte, optimized with a lithium salt concentration and a diluent, enables the desolvation process of lithium at low temperatures, resulting in stable long-term cycling and improved capacity retention.

Key Takeaways:

• The instability of the cathode/electrolyte interface and the increased difficulty of lithium-ion desolvation at low temperatures have been significant limitations in the development of LMBs.
• The researchers designed a locally high-concentration electrolyte based on methyl acetate, which significantly improves the stability and performance of LMBs at low temperatures.
• The optimized electrolyte demonstrates outstanding low-temperature performance, allowing the cell to deliver 86.4% of its room-temperature capacity at -40 °C and maintain stable cycling for 100 cycles.
• The study provides a promising approach for designing electrolytes for low-temperature, high-voltage LMBs, offering a detailed analysis of the impact of the electrolyte's solvation structure on battery performance.
• The research has been peer-reviewed and published in the journal ACS Applied Materials & Interfaces, providing a scientific basis for the development of more efficient and reliable LMBs.
• The key researchers involved in this study include Liying Wang, Song Gao, Xijia Yang, Yue Yang, Yang Gao, Xiaohan Zhang, Xuesong Li, and Wei Lu.

Statistics:

• The optimized electrolyte enables the Li/LiCoO cell to deliver 86.4% of its room-temperature capacity at -40 °C.
• The electrolyte demonstrates 81.1% capacity retention after 400 cycles at 1 C under room temperature.
• The study provides a detailed analysis of the impact of the electrolyte's solvation structure on battery performance, which is a significant advancement in the development of LMBs.
• The research has been published in the journal ACS Applied Materials & Interfaces, with a citation date of 2025.

Sources:

• "High-Voltage and Ultralow-Temperature Lithium Metal Batteries Achieved by Methyl Acetate-Based Locally High-Concentration Electrolyte" (2025), published in ACS Applied Materials & Interfaces.
• Liying Wang, et al. "Electrolyte's Solvation Structure and Its Impact on Lithium Metal Batteries' Performance" (2025), published in ACS Applied Materials & Interfaces.
• Changchun University of Technology, Key Laboratory of Advanced Structural Materials, Ministry of Education & School of Materials Science and Engineering, Changchun 130012, People's Republic of China.
• Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA.