Polymer Blend Electrode Binders for Homogeneous Solid-State Batteries
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Solution Overview
Problem
Current all-solid-state electrochemical systems face challenges in achieving improved dispersion and properties of their components, leading to inhomogeneous electrodes, which can be addressed by developing new binder compositions that enhance the distribution and interaction between solid electrolyte and electrochemically active materials.
Innovation Solution
A binder composition comprising a blend of polybutadiene-based and polynorbornene-based polymers, specifically with norbornene-based monomer units, is used to improve the dispersion and interaction between solid electrolyte and electrochemically active materials, optimizing the properties of all-solid-state electrochemical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional binders are used in all-solid-state electrochemical systems, then the manufacturing process is simple, but the dispersion of solid electrolyte and active material particles is poor leading to inhomogeneous electrodes
Solution Approach 1:
The patent applies composite materials by combining polynorbornene-based polymer and polybutadiene-based polymer in a blend ratio of 1:4 to 4:1 to create a binder composition that achieves both improved particle dispersion and manageable manufacturing complexity. The composite binder leverages the complementary properties of each polymer to resolve the contradiction between dispersion quality and composition simplicity.
Solution Approach 2:
The patent employs parameter changes by adjusting the molecular weight of the polynorbornene-based polymer to between 10,000 and 100,000 g/mol and optimizing the blend ratio with polybutadiene-based polymer. These parameter adjustments enable the binder to achieve optimal dispersion of solid electrolyte and active material particles while maintaining practical manufacturability.
2Reliability
If polynorbornene-based polymer is added to suppress parasitic reactions, then the electrochemical stability is improved, but the viscosity of the binder increases making processing more difficult
Solution Approach 1:
The patent resolves the contradiction between electrochemical stability and processing ease by optimizing the molecular weight of polynorbornene-based polymer to a specific range (10,000-100,000 g/mol) and controlling the blend ratio with polybutadiene-based polymer. These parameter changes reduce viscosity while preserving the electrochemical stability benefits of polynorbornene.
Solution Approach 2:
The patent uses polybutadiene-based polymer as an intermediary that mediates between the high-viscosity polynorbornene-based polymer and the processing requirements. The polybutadiene component acts as a viscosity modifier that enables easier processing while allowing the polynorbornene to maintain its electrochemical stability functions.
3Reliability
If solid electrolyte particles are used, then the safety and efficiency are improved, but the particles tend to agglomerate during mixing reducing electrode homogeneity
Solution Approach 1:
The patent employs the polymer blend binder as an intermediary substance that prevents agglomeration of solid electrolyte particles during mixing. The binder's composition creates a matrix that maintains particle separation and uniform distribution, ensuring electrode homogeneity while preserving the safety and efficiency benefits of solid electrolyte.
Solution Approach 2:
The patent uses composite materials by formulating a binder composition that combines polynorbornene-based and polybutadiene-based polymers in optimized ratios. This composite binder provides both the dispersion capability needed to prevent solid electrolyte agglomeration and the binding strength required for electrode integrity.
Data Source
AI summary
The present technology relates to binder compositions and binders comprising a blend comprising a polybutadiene-based polymer and a polynorbornene-based polymer comprising norbornene-based monomer units derived from the polymerization of an optionally substituted norbornene-based monomer for use in electrochemical applications, particularly in electrochemical accumulators such as all-solid-state batteries. Also described are electrode materials comprising said binder or binder composition and their use in electrochemical cells, for example, in electrochemical accumulators, particularly in all-solid-state batteries.