Non-aqueous Battery Functional Layer Binder Composition
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Solution Overview
Problem
Non-aqueous secondary battery functional layers with water-soluble polymers as binders face issues with inadequate redispersibility of non-conductive particles and flexibility, leading to potential curling during drying or stress.
Innovation Solution
A composition combining a water-soluble polymer with a (meth)acrylamide monomer unit in high proportion and a particulate polymer, optimizing the weight average molecular weight and content to enhance redispersibility and flexibility, preventing curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a water-soluble polymer is used as a binder in the composition for a non-aqueous secondary battery functional layer, then binding capacity and homogeneity are improved, but redispersibility of non-conductive particles deteriorates and flexibility of the functional layer deteriorates
Solution Approach 1:
The patent uses a composite binder system combining a water-soluble polymer (providing homogeneity and binding capacity) with a water-insoluble polymer (providing redispersibility and flexibility). This composite approach allows the functional layer to maintain both good initial homogeneity and excellent redispersibility after storage, resolving the contradiction between stability and ease of operation.
2Stability of the object's composition
If a water-soluble polymer is used as a binder in the composition for a non-aqueous secondary battery functional layer, then binding capacity and homogeneity are improved, but flexibility of the functional layer deteriorates
Solution Approach 1:
The patent employs a composite binder system where a water-soluble polymer provides homogeneity and binding capacity, while a water-insoluble polymer provides flexibility and prevents curling. This combination allows the functional layer to maintain both good homogeneity and excellent flexibility, resolving the contradiction between stability and shape characteristics.
3Duration of action of stationary object
If the composition for a non-aqueous secondary battery functional layer is stored for a long period, then production logistics are improved, but non-conductive particles sediment and redispersibility deteriorates
Solution Approach 1:
The patent uses a composite binder system where the water-insoluble polymer component provides excellent redispersibility after long-term storage. This allows the composition to be stored for extended periods without significant sedimentation issues, and when needed, the non-conductive particles can be easily redispersed, resolving the contradiction between storage duration and ease of operation.
Data Source
AI summary
Provided is a composition for a non-aqueous secondary battery functional layer that has excellent redispersibility of non-conductive particles and enables formation of a functional layer for a non-aqueous secondary battery having excellent flexibility. Also provided are a functional layer for a non-aqueous secondary battery formed using this composition for a non-aqueous secondary battery functional layer and a non-aqueous secondary battery including this functional layer for a non-aqueous secondary battery. The composition for a non-aqueous secondary battery functional layer contains non-conductive particles, a water-soluble polymer that includes a (meth)acrylamide monomer unit in a proportion of 40 mass% or more and has a weight average molecular weight of less than 3.0 × 105, and a particulate polymer.