Particle Binder Composition for Large-Area Solid-State Electrodes
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Solution Overview
Problem
The existing methods for manufacturing all-solid-state battery electrodes, either through dry or wet processes, face limitations such as difficulty in scaling up the electrode size or interference with lithium ion movement due to the use of binders, which affect battery capacity, life, and output characteristics.
Innovation Solution
A binder solution comprising a rubber-based binder, a first solvent in which the binder is soluble, and a second solvent where the binder is insoluble, is used to form a binder solution that minimizes surface coverage of electrode active materials and solid electrolytes, allowing for unobstructed lithium ion delivery paths by precipitating the binder in particle form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder is added to the electrode slurry to maintain shape, then the electrode can be formed with proper adhesion, but the binder covers the surfaces of particles and prevents lithium ion movement, causing deterioration in battery capacity, life, and output characteristics
Solution Approach 1:
The invention changes the physical state and size parameters of the binder by forming ultrafine particles (1-100 nm diameter) through controlled precipitation. This parameter change allows the binder to provide sufficient adhesion while minimizing surface coverage, thus resolving the contradiction between binding strength and lithium ion mobility.
Solution Approach 2:
The binder particles form a porous network structure that provides adhesion while leaving channels open for lithium ion transport. The porous nature of the ultrafine particle assembly allows ions to move through the electrode without being blocked by binder material, maintaining both structural integrity and electrochemical performance.
2Ease of manufacture
If the dry process is used to manufacture electrodes by pressing powder materials, then the manufacturing process is simple, but it is difficult to increase the electrode size
Solution Approach 1:
The invention employs a wet process using slurry formulation and drying, where the binder solution creates a workable paste that can be applied to large areas. This hydraulic approach allows for scalable electrode manufacturing while maintaining process simplicity through the use of liquid binders that facilitate uniform distribution of active materials.
3Area of stationary object
If the wet process is used to form electrodes by applying and drying electrode slurry, then large-sized electrodes can be manufactured, but a binder must be added which may cover particle surfaces and prevent lithium ion movement
Solution Approach 1:
The invention changes the size parameter of binder particles to ultrafine dimensions (1-100 nm) through controlled precipitation using non-solvents. This parameter change reduces the total surface area of binder particles, minimizing their interference with lithium ion movement while still providing necessary adhesion for large-area electrode structures.
Solution Approach 2:
The invention creates a composite structure where ultrafine binder particles are distributed throughout the electrode matrix alongside active materials and conductive additives. This composite approach allows the binder to perform its adhesive function while the overall material composition maintains high conductivity and ion transport pathways.
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
This approach enables the formation of a large-area electrode with increased exposed areas for lithium ion delivery, enhancing battery performance by maintaining binding force while reducing interference, thus improving capacity, life, and output characteristics.
Implementation Method 1
a first solvent for dissolving the rubber-based binder
Implementation Method 2
a second solvent in which the rubber-based binder is insoluble and which is miscible with the first solvent
Data Source
AI summary
Disclosed are a binder solution for an all-solid-state battery including a binder in the form of particles, and a method of manufacturing the same. The binder solution may include a rubber-based binder, a first solvent for dissolving the rubber-based binder, and a second solvent in which the rubber-based binder is insoluble and which is miscible with the first solvent.