A polycarboxylic/ether composite polymer electrolyte via in situ UV-curing for all-solid-state lithium battery

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Developing stable and conductive electrolytes is crucial for high-performance lithium-ion batteries.
• Polymer electrolytes offer potential advantages in safety and flexibility over liquid electrolytes.
• Existing polymer electrolytes often face challenges with ionic conductivity and interfacial stability.

Purpose of the Study:

• To synthesize a novel polycarboxylic/ether composite polymer electrolyte.
• To investigate the electrochemical properties and stability of the synthesized electrolyte.
• To evaluate the performance of lithium-ion cells utilizing this composite electrolyte.

Main Methods:

• In situ synthesis of a composite polymer electrolyte on the cathode using a two-arm monomer and polyethylene oxide (PEO).
• Characterization of ionic conductivity using electrochemical impedance spectroscopy.
• Assessment of electrochemical stability and cycling performance in Li/LiFePO4 cells.

Main Results:

• The composite electrolyte achieved an ionic conductivity of 3.6 × 10^-5 S cm^-1.
• Demonstrated high oxidation stability and excellent stability against lithium metal.
• Li/LiFePO4 cells exhibited good cyclic and rate performance at 25°C.

Conclusions:

• The in situ synthesized polycarboxylic/ether composite polymer electrolyte shows promising properties for lithium-ion battery applications.
• The electrolyte's high ionic conductivity and stability contribute to enhanced battery performance.
• This composite electrolyte represents a viable alternative for improving lithium-ion battery technology.