All-Solid-State Battery Electrode Sheet for Vibration-Stable Adhesion
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Solution Overview
Problem
All-solid state secondary batteries face performance deterioration due to repeated vibration during manufacturing processes, particularly in industrial methods like roll-to-roll manufacturing, as the adhesive forces between solid particles and the collector are not sufficient, leading to a collapse of the adhesion state.
Innovation Solution
The electrode sheet for all-solid state secondary batteries is designed with a specific distribution of carbon-containing materials and polymer binders, ensuring that the area ratios of these materials satisfy certain expressions, thereby strengthening particle and interlayer adhesive forces, even under repeated vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymer binder is used to strengthen particle adhesive force and interlayer adhesive force, then adhesion strength is improved, but the adhesive force deteriorates under repeated vibration
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by specifying precise proportions of different polymer types (polyacrylic acid: 5-30 parts, carboxymethyl cellulose: 5-30 parts, styrene-butadiene rubber: 5-30 parts) relative to 100 parts of inorganic solid electrolyte. This multi-component polymer system with controlled ratios maintains strong adhesion while resisting vibration-induced deterioration.
Solution Approach 2:
The patent creates a composite binder system combining three different polymer types with complementary properties: polyacrylic acid for chemical bonding, carboxymethyl cellulose for structural integrity, and styrene-butadiene rubber for elasticity and vibration resistance. This composite approach achieves both strong initial adhesion and sustained performance under vibration.
2Quantity of substance
If solid particles are used to form the active material layer, then energy density is improved, but particle adhesive force and interlayer adhesive force are insufficient
Solution Approach 1:
The patent introduces a specifically formulated polymer binder as an intermediary substance between the inorganic solid electrolyte particles and the collector. This binder mediates the interface, providing sufficient adhesive force to hold the high-density solid particle structure together and attach it to the collector without compromising energy density.
Solution Approach 2:
The patent optimizes the binder content parameter, specifying 5-30 parts of polymer binder per 100 parts of inorganic solid electrolyte. This controlled parameter ensures enough binder to maintain particle adhesion and interlayer strength while minimizing binder volume to preserve the high energy density characteristic of solid-state batteries.
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 electrode sheet maintains electron conductivity and suppresses performance deterioration, achieving excellent cycle characteristics by ensuring the adhesive forces remain strong even under repeated vibration.
Implementation Method 1
the adhesive force between the solid particles in the active material layer (may be referred to as particle adhesive force) and the interlayer adhesive force between the active material layer and the collector are not sufficient, a polymer binder is typically used in combination to strengthen the particle adhesive force and the interlayer adhesive force
Implementation Method 2
In an all-solid state secondary battery, all of a negative electrode, an electrolyte, and a positive electrode consist of solid
Data Source
AI summary
An electrode sheet for an all-solid state secondary battery, including: an active material layer on at least one surface of a collector, in which the active material layer has an inorganic solid electrolyte (A) having an ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table and an active material (B), and the active material layer satisfies Expression (1) and Expression (2), the all-solid state secondary battery having the electrode sheet as at least one electrode.1.4<S1/S100,Expression(1)0.05<S1<0.60Expression(2)S1 represents an area ratio of a total area of a material containing a carbon atom in a cross-sectional region having a layer thickness of 1% or less of the active material layer from the surface of the collector, and S100 represents an area ratio of a total area of the material containing a carbon atom in a cross-sectional region having a layer thickness of more than 1% of the active material layer from the surface of the collector.