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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Stabilizing the Bilateral Interfaces by a PVDF-Based Double-Layer Solid Composite Electrolyte with a Relieved

Yan Yuan¹, Xuyi Liu¹, Xinyi Dong¹

¹School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.

ACS Applied Materials & Interfaces

|October 17, 2024

Summary

A novel double-layer solid electrolyte using poly(acrylic acid) and lithium difluoro(oxalato)borate enhances poly(vinylidene fluoride) stability. This improves solid-state lithium metal battery performance and cycle life at room temperature.

Keywords:

LiDFOB PAA dehydrofluorination interface lithium metal battery solid composite electrolyte

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Poly(vinylidene fluoride) (PVDF) based solid composite electrolytes (SCEs) suffer from dehydrofluorination caused by alkaline ceramic fillers.
This degradation compromises the properties of SCEs and hinders the performance of solid-state lithium metal batteries (SLMBs).

Purpose of the Study:

To develop a stable PVDF-based double-layer solid electrolyte for improved SLMB performance.
To mitigate the dehydrofluorination of PVDF and enhance electrode compatibility.

Main Methods:

Fabrication of a unique PVDF-based double-layer solid electrolyte.
Incorporation of poly(acrylic acid) (PAA) as an alkalinity-scavenging agent near the Li anode.
Addition of lithium difluoro(oxalato)borate (LiDFOB) as a film-forming additive facing the cathode.

Main Results:

Poly(acrylic acid) effectively reduced the dehydrofluorination of the PVDF matrix, improving lithium plating/stripping reversibility.
Lithium difluoro(oxalato)borate facilitated the formation of a stable passivation film on the cathode.
The double-layer SCE exhibited excellent compatibility with both Li anode and cathode.

Conclusions:

The developed double-layer solid electrolyte significantly enhances the stability and performance of SLMBs.
The strategy effectively addresses PVDF degradation issues in ceramic-filled SCEs.
The SLMBs demonstrated superior cycle and rate performance at room temperature.