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Published on: December 20, 2016
Dual-Domain Coupling-Driven Interface Remodeling Enables Ultra-Dilute Flame-Retardant Electrolytes for High-Voltage,
Zhen-Yi Gu1, Yong-Li Heng1, Xiao-Tong Wang1
1State Key Laboratory of Integrated Optoelectronics, and MOE Key Laboratory For UV Light-Emitting Materials and Technology, Department of Physics, Northeast Normal University, Changchun, Jilin, P. R. China.
Researchers developed a new ultra-dilute electrolyte (UDE) strategy for sustainable batteries. This approach enhances performance under extreme conditions by remodeling interfaces, improving stability, longevity, and safety for advanced energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Sustainable Energy
Background:
- Ultra-dilute electrolytes (UDEs) offer cost advantages for sustainable batteries but face performance trade-offs due to excess solvents.
- Challenges include achieving high-voltage stability, wide-temperature adaptability, longevity, and safety simultaneously.
Purpose of the Study:
- To develop a novel strategy for interface remodeling in UDEs to overcome existing performance limitations.
- To tailor both bulk solvation and interfacial microenvironments for enhanced battery performance.
Main Methods:
- Proposed a dual-domain coupling-driven interface remodeling strategy.
- Integrated hierarchically-solvated carbonate ester, ether, and fluorinated cyclophosphazene into a 0.05 M UDE.
- Utilized molecular competitive adsorption and electric field induction to regulate electrode interfaces.
Main Results:
- The designed UDE demonstrated a flexible solvation configuration with less restricted ion transport.
- Achieved intrinsic flame retardancy and improved electrode compatibility (phosphate/oxide cathodes, metal anode) via bidirectional interface stabilization.
- Enabled durable Na0.67Ni0.33Mn0.67O2 cathode operation from -40°C to 70°C.
- Extended the strategy to potassium-ion batteries, enabling stable 4.95 V KVPO4F cathode operation.
Conclusions:
- Established a universal framework for multi-scale interfacial molecular engineering in electrolytes.
- Demonstrated a promising advancement for sustainable batteries operating under extreme conditions.
- The strategy effectively overcomes performance limitations of UDEs, paving the way for next-generation energy storage.
