Simultaneous Structure, Thermal, and Mechanics Regulation for Boosting Performance of PVDF-Based Solid-State...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Batteries

Background:

• Poly(vinylidene fluoride) (PVDF) shows promise for polymer solid-state electrolytes (PSEs).
• PVDF-based PSEs face challenges: low ionic conductivity, uneven strain, and lithium dendrite growth.
• Developing stable and conductive solid-state electrolytes is crucial for next-generation batteries.

Purpose of the Study:

• To enhance PVDF-based PSEs by incorporating LiZr2(PO4)3 (LZP).
• To investigate the effects of LZP on ionic conductivity, thermal regulation, and mechanical stability.
• To improve the cycling performance and interface integrity of solid-state lithium-ion batteries.

Main Methods:

• Incorporation of LiZr2(PO4)3 (LZP), a fast ion conductor with negative thermal expansion, into PVDF.
• Multifarious experimental investigations to analyze material properties and electrochemical performance.
• Fabrication and testing of full solid-state lithium-ion cells using modified electrolytes.

Main Results:

• Ionic conductivity increased to 3.3 × 10^-4 S cm^-1 with 10 wt% LZP.
• Enhanced PVDF-based PSEs showed improved thermal regulation and volume expansion control.
• Full cells (Li|PVDF-LZP|LFP and Li|PVDF-LZP|NCM) exhibited significantly improved capacity retention after cycling.

Conclusions:

• LZP incorporation effectively enhances PVDF-based PSEs by improving chain mobility and Li+ concentration.
• LZP addition regulates heat and volume changes, protecting electrode integrity and interface.
• This strategy offers a novel approach for developing advanced solid-state electrolytes by optimizing structure, thermal, and mechanical properties.