Composite Anode Binder for Low-Solvent Adhesion in Solid-State Batteries
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Solution Overview
Problem
Existing rubber-based binders in composite anode layers of all-solid-state batteries exhibit low solubility in nonpolar or low polarity solvents, leading to insufficient binding and adhesion properties, which affect the stability and lifespan of the battery.
Innovation Solution
Employing an ethylene-vinyl acetate copolymer as a binder that is soluble in nonpolar or low polarity solvents, allowing for improved binding and adhesion properties even with a low binder content, thereby enhancing the mechanical and electrical properties of the composite anode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rubber-based binders are used in composite anode layers, then binding properties are improved, but solubility in nonpolar or low polarity solvents deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using ethylene-vinyl acetate copolymer with specific vinyl acetate content (10-90 wt%) instead of conventional rubber-based binders. This parameter change enables the binder to be soluble in nonpolar or low polarity solvents while maintaining excellent binding properties, resolving the contradiction between binding strength and solvent solubility.
2Productivity
If binder content is reduced to improve battery performance, then adhesion properties deteriorate, but using ethylene-vinyl acetate copolymer resolves this
Solution Approach 1:
By changing the binder material parameters to ethylene-vinyl acetate copolymer with optimized vinyl acetate content, the patent achieves high adhesion properties even at low binder content (0.1-5 wt%). This allows reduction of binder quantity to improve battery output characteristics while maintaining reliable adhesion properties.
3Reliability
If conventional rubber-based binders are used, then adhesion to current collector is insufficient, but ethylene-vinyl acetate copolymer improves adhesion
Solution Approach 1:
The patent changes the chemical parameters of the binder to ethylene-vinyl acetate copolymer, which has appropriate solubility in nonpolar or low polarity solvents. This parameter change enables easy manufacturing through conventional coating processes while achieving excellent adhesion to current collector, resolving the contradiction between adhesion quality and manufacturing ease.
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 use of ethylene-vinyl acetate copolymer results in an all-solid-state battery with improved output characteristics and lifespan, despite a reduced binder amount, by ensuring high binding and adhesion properties.
Implementation Method 1
a binder soluble in a nonpolar or low polarity solvent... the binder may include an ethylene-vinyl acetate copolymer
Implementation Method 2
a binder capable of binding the anode active material and the solid electrolyte together... exhibiting high binding and adhesion properties
Data Source
AI summary
A composite anode layer including a binder for an all-solid-state battery with excellent adhesion properties, an all-solid-state battery including the same, and a method of manufacturing a composite anode including the composite anode layer, in which a binder that is soluble in a nonpolar or low polarity solvent can be employed in an anode layer, thus making it possible to manufacture a composite anode for an all-solid-state battery that exhibits high adhesion properties even when the amount of the binder is low and has improved lifespan characteristics.