Battery Functional Layer Binder Composition for Aggregate-Free Slurries
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Solution Overview
Problem
Conventional binder compositions for non-aqueous secondary battery functional layers suffer from aggregate formation and inadequate high-temperature storage characteristics when inorganic particles are compounded, leading to reduced stability and performance.
Innovation Solution
A binder composition with specific electrical conductivity, pH, and particulate polymer properties is developed, inhibiting aggregate formation and enhancing high-temperature storage characteristics by improving dispersibility and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic particles are added to a water dispersion of particulate polymer to form a slurry composition, then heat resistance and strength are improved, but aggregate formation occurs and dispersibility deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the particulate polymer within 30-100°C and the electrolyte solution contact angle within 0-35°. These parameter optimizations enable the binder to maintain appropriate viscosity and wetting properties, preventing aggregate formation while ensuring good dispersibility of inorganic particles in the slurry composition.
Solution Approach 2:
The patent uses composite materials by combining particulate polymer particles with inorganic particles (such as alumina, silica, or boehmite) to form a slurry composition. This composite approach allows the functional layer to simultaneously achieve heat resistance from inorganic particles and binding strength from the polymer, while the controlled Tg and contact angle ensure stable dispersion without aggregation.
2Temperature
If conventional slurry composition is used to form functional layer, then heat resistance is improved, but high-temperature storage characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the glass transition temperature of the particulate polymer to be within 30-100°C. This Tg range ensures that the binder maintains appropriate flexibility and adhesion at high temperatures without becoming too rigid or too soft, thereby improving high-temperature storage characteristics while preserving heat resistance.
Solution Approach 2:
The patent employs a water dispersion system that can be easily applied and dried to form a functional layer. The water-based slurry composition allows for simple processing and forms a stable functional layer that provides reliable high-temperature storage characteristics without requiring complex processing conditions.
3Manufacturing precision
If inorganic particles are compounded in binder composition, then functional performance is improved, but aggregate formation increases and stability decreases
Solution Approach 1:
The patent applies parameter changes by controlling the electrolyte solution contact angle of the particulate polymer to be within 0-35°. This contact angle optimization ensures that the binder has appropriate wetting ability to disperse inorganic particles uniformly, preventing aggregate formation and maintaining slurry composition stability while achieving the desired functional performance.
Solution Approach 2:
The particulate polymer acts as an intermediary binder between inorganic particles and the substrate. By controlling its Tg and contact angle, the polymer mediates the interaction between inorganic particles and the substrate, ensuring uniform dispersion and stable slurry composition while providing the necessary functional performance to the functional layer.
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 binder composition effectively prevents aggregate formation and improves high-temperature storage characteristics of non-aqueous secondary batteries by ensuring stable dispersion and adhesion, thereby enhancing battery performance.
Implementation Method 1
the binder composition has a specific electrical conductivity within a predetermined range, thereby inhibiting aggregation
Implementation Method 2
improving dispersibility and adhesiveness
Data Source
AI summary
Provided is a binder composition for a non-aqueous secondary battery functional layer that inhibits the formation of aggregates in a situation in which inorganic particles are compounded and is capable of forming a functional layer that can improve high-temperature storage characteristics of a secondary battery. The binder composition for a non-aqueous secondary battery functional layer contains a particulate polymer A and a dispersion medium. The electrical conductivity of the binder composition for a non-aqueous secondary battery functional layer at a solid content concentration of 20 mass% is not less than 1.0 mS/cm and not more than 10 mS/cm.