Crosslinked Binder for All-Solid-State Battery Stability
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Solution Overview
Problem
Anodeless all-solid-state batteries face stability issues due to the expansion of the intermediate layer during charging and discharging, which affects the battery's lifespan and stability.
Innovation Solution
A highly elastic crosslinked binder is developed, incorporating a polymer with carbonyl groups and a linker with amino groups, which forms a three-dimensional network structure to minimize volumetric expansion and contraction, using a polyurethane-based polymer and linkers like aminophenyl disulfide, and is prepared through a reaction with an acid catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal capable of forming an alloy with lithium is used in the intermediate layer, then lithium metal can be uniformly deposited on the anode current collector, but the metal expands during charging, resulting in defects in the intermediate layer
Solution Approach 1:
The patent introduces a binder as an intermediary substance between the metal particles in the intermediate layer. This binder mediates the expansion stress during charging by providing a flexible matrix that can accommodate volume changes, preventing direct contact and stress concentration between metal particles, thus avoiding defects while maintaining uniform lithium deposition
Solution Approach 2:
The patent creates a composite intermediate layer structure consisting of metal particles dispersed in a binder matrix. This composite structure combines the lithium-alloying capability of metals with the mechanical flexibility and stress-absorbing properties of the binder, resolving the contradiction between achieving uniform lithium deposition and maintaining structural stability
2Duration of action of stationary object
If a binder is used to control expansion of the intermediate layer, then the stability and lifespan of the battery is improved, but the complexity of the intermediate layer composition increases
Solution Approach 1:
The patent optimizes the molecular weight and functional group composition of the binder to achieve the desired balance between elasticity and adhesion. By carefully selecting binder parameters (molecular weight range, specific functional groups), the patent achieves effective expansion control without requiring complex multi-component systems
Solution Approach 2:
The patent applies the binder specifically in the intermediate layer where expansion control is needed, while other battery components maintain their conventional compositions. This localized application of the binder solution addresses the expansion issue without unnecessarily complicating the entire battery structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The binder effectively relieves stress and enhances the stability and lifespan of lithium secondary batteries by maintaining the inherent physical properties of the electrodes during charging and discharging cycles.
Implementation Method 1
All or a part of an oxygen atom of the carbonyl group may be substituted with a nitrogen atom of the amino groups such that a first end of the linker may be bonded to the carbonyl group of one polymer and a second end of the linker may be bonded to the carbonyl group of another polymer
Implementation Method 2
a highly elastic binder capable of efficiently controlling the expansion of the intermediate layer during the charging and discharging
Data Source
AI summary
The present disclosure relates to a binder for a solid-state battery and a manufacturing method thereof. The binder may include a polymer comprising a carbonyl group and a linker comprising amino groups at both ends.