All-Solid Battery Electrode Sheet Primer Layer Design
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Solution Overview
Problem
Existing all-solid state secondary batteries face challenges with flexibility and peel strength, leading to cracking and increased resistance due to the crosslinked structure between the diene copolymer and inorganic solid electrolyte, which limits their practical application.
Innovation Solution
An electrode sheet configuration with a primer layer including a binder and an electrode active material layer containing an inorganic solid electrolyte, active material, and binder particles, where the binder is present on the adhesive interface side and does not form a crosslinked structure with the electrolyte, optimizing the binder ratio and particle size to enhance binding properties and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a crosslinked structure is formed between the diene copolymer and inorganic solid electrolyte to improve peel strength, then binding properties between current collector and electrode mixture layer are enhanced, but flexibility is reduced and cracking occurs
Solution Approach 1:
The patent extracts the harmful crosslinked structure formation by selecting a binder polymer that does not contain carbon-carbon double bonds, thereby preventing the crosslinking reaction with the inorganic solid electrolyte while maintaining binding properties through alternative mechanisms
Solution Approach 2:
The patent changes the chemical parameter of the binder polymer by selecting materials without carbon-carbon double bonds (such as polyvinylidene fluoride, polyacrylonitrile, or carboxymethyl cellulose), which fundamentally alters the interaction mechanism from crosslinking to other binding modes that preserve flexibility
2Strength
If a crosslinked structure is formed between the diene copolymer and inorganic solid electrolyte to improve peel strength, then binding properties between current collector and electrode mixture layer are enhanced, but resistance increases
Solution Approach 1:
The patent removes the crosslinked structure formation by using binder polymers without carbon-carbon double bonds, thereby eliminating the source of increased resistance while maintaining adequate binding properties through the primer layer and optimized binder composition
Solution Approach 2:
The patent introduces a primer layer as an intermediary between the current collector and electrode mixture layer, which provides binding functionality without requiring crosslinking reactions that would increase resistance
Data Source
AI summary
Provided are an electrode sheet for an all-solid state secondary battery, an all-solid state secondary battery, a method of manufacturing an electrode sheet for an all-solid state secondary battery, and a method of manufacturing an all-solid state secondary battery. The electrode sheet for an all-solid state secondary battery includes a current collector, a primer layer, and an electrode active material layer in this order,in which the primer layer includes a binder (A),the electrode active material layer includes an inorganic solid electrolyte (B), an active material (C), and binder particles (D) having an average particle size of 1 nm to 10 μm and further includes the binder (A) on at least an adhesive interface side with the primer layer, anda crosslinked structure is not formed between the binder (A) and the inorganic solid electrolyte (B).