Binder Composition for Non-Aqueous Battery Membrane Dusting
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Solution Overview
Problem
Non-aqueous secondary battery porous membranes face challenges with insufficient adhesiveness, leading to dusting and misalignment issues during battery production, affecting performance and productivity.
Innovation Solution
A binder composition with a specific organic solvent and polymer structure, featuring a nitrile group and straight chain alkylene units, is used to enhance dusting resistance and process adhesiveness, improving the membrane's properties and battery characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a binder is used to form a porous membrane with non-conductive particles, then the membrane structure is formed and maintained, but the adhesiveness between the binder and particles may be insufficient causing dusting
Solution Approach 1:
The patent changes the chemical parameters of the binder by specifying functional groups (carboxyl, hydroxyl, or amine groups with specific content ranges). This chemical modification enhances the adhesiveness between the binder and non-conductive particles, thereby improving dusting resistance while maintaining membrane structure integrity.
Solution Approach 2:
The patent creates a composite binder system by combining organic binder components with specific functional groups and inorganic additives (metal oxides or hydroxides). This composite structure provides both structural support and enhanced adhesion, resolving the contradiction between membrane formation and dusting resistance.
2Reliability
If the binder adhesiveness is increased to prevent dusting, then dusting resistance improves, but process adhesiveness during battery production may be affected
Solution Approach 1:
The patent applies local quality by differentiating the adhesive properties at different interfaces: the binder provides strong adhesion to non-conductive particles (preventing dusting) while maintaining appropriate process adhesiveness for battery assembly. The functional groups are strategically positioned to interact with particles, while the overall binder composition ensures proper handling characteristics during manufacturing.
3Ease of operation
If the porous membrane is made more adhesive to prevent misalignment during production, then process adhesiveness improves, but the membrane may become less effective at preventing short-circuits
Solution Approach 1:
The patent utilizes porous material structure where the binder forms a matrix with controlled porosity. This allows the membrane to maintain high process adhesiveness through the binder's functional groups while the porous structure ensures ion transport capability and electrical insulation, preventing short-circuits between electrodes.
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 proposed binder composition significantly improves the dusting resistance and process adhesiveness of the porous membrane, enhancing the high-temperature cycle characteristics and low-temperature output characteristics of non-aqueous secondary batteries.
Implementation Method 1
by using an organic solvent with a boiling point in a specific temperature range and facilitating polymer precipitation in the formation of the porous membrane
Implementation Method 2
an absolute difference |SPdiff| between a solubility parameter SPp of the polymer and a solubility parameter SPs of the organic solvent is 1.5 or more and 6.0 or less
Implementation Method 3
a binder composition for a non-aqueous secondary battery porous membrane including a polymer and an organic solvent... capable of forming a porous membrane that has excellent dusting resistance and process adhesiveness
Data Source
AI summary
A binder composition for a non-aqueous secondary battery porous membrane comprises: a polymer; and an organic solvent, wherein a boiling point of the organic solvent is 30 °C or more and 100 °C or less, and an absolute difference |SPdiff| = |SPp - SPs| between a solubility parameter SPp of the polymer and a solubility parameter SPs of the organic solvent is 1.5 or more and 6.0 or less.