Solid-State Battery Electrode Bonding Layer Design
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Solution Overview
Problem
Existing methods for preparing solid-state batteries face challenges in efficiently increasing electrode area and preventing degradation of sulfide-based solid electrolytes, which react with binders and solvents, leading to poor bonding between electrodes and current collecting members.
Innovation Solution
A solid-state battery electrode design incorporating a bonding layer with a non-polar first binder that interdiffuses with the electrode layer and a polar second binder that strongly bonds to the current collecting member, using a conductive material to enhance bonding strength and prevent electrolyte degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder or solvent is used to bind the electrode and current collecting member, then bonding strength is improved, but sulfide-based solid electrolyte degradation occurs due to chemical reaction
Solution Approach 1:
A bonding film is introduced as an intermediary layer between the electrode and current collecting member. This bonding film contains binders and solvents that do not chemically react with the sulfide-based solid electrolyte, thereby preventing electrolyte degradation while still providing sufficient bonding strength to hold the electrode structure together.
Solution Approach 2:
The bonding function is segmented into two distinct components: the bonding film containing reactive binders/solvents for structural bonding, and the electrode layer containing inert binders/solvents for electrolyte protection. This segmentation allows each component to perform its specific function without causing harm to the electrolyte.
2Strength
If a conductive bonding material containing ethyl acetate is used to bind the current collecting member and conductive layer, then bonding strength is improved, but the electrode and current collecting member may still not be substantially bound
Solution Approach 1:
The bonding film is formulated as a composite material containing multiple components including conductive materials (such as acetylene black, graphite, or metal powders) and binders. This composite structure provides both electrical conductivity for reliable charge collection and sufficient mechanical bonding strength to substantially bind the electrode to the current collecting member.
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 solution effectively prevents sulfide-based solid electrolyte degradation and ensures strong bonding between the electrode and current collecting member, improving the structural integrity and performance of solid-state batteries.
Implementation Method 1
a bonding layer with a non-polar first binder that interdiffuses with the electrode layer
Implementation Method 2
a polar second binder that strongly bonds to the current collecting member
Data Source
AI summary
Provided are an electrode for solid-state batteries, a method of preparing the electrode, a solid-state battery including the electrode, and a bonding film used for the method of preparing the electrode. The electrode for solid-state batteries include a bonding layer interposed between an electrode layer and a current collecting member and bound to the electrode layer, where the bonding layer includes a first binder which is inactive to the solid electrolyte, a second binder which has a stronger binding ability to the current collecting member than a bonding strength of the first binder to the current collecting member; and a bonding layer conductive material.