A multifunctional polymeric additive with a synergistic effect for high-performance lithium-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Developing advanced electrolytes is crucial for high-performance lithium-ion batteries.
• Existing electrolytes face challenges with flame retardance and ion transport efficiency.

Purpose of the Study:

• To introduce a novel multifunctional polymeric additive, poly(ethylene phosphate acrylonitrile).
• To enhance carbonate electrolytes with flame retardance, improved Li-ion transport, and stable cathode interfaces.

Main Methods:

• Synthesis of poly(ethylene phosphate acrylonitrile).
• Incorporation into carbonate electrolytes for lithium-ion battery testing.
• Electrochemical performance evaluation, including cycling stability and rate capability.

Main Results:

• The additive imparts excellent flame retardance to the electrolyte.
• Enhanced lithium-ion dissociation and transportation were observed.
• A stable LiFePO4 cathode electrolyte interphase (CEI) layer was formed.
• Ultra-stable battery operation for 1500 cycles at a 20C-rate with good discharge capacity was achieved.

Conclusions:

• Poly(ethylene phosphate acrylonitrile) is a promising multifunctional additive for advanced lithium-ion batteries.
• The additive synergistically improves electrolyte properties, leading to enhanced electrochemical performance and safety.
• This work offers a new strategy for designing high-stability battery electrolytes.