Battery Separator Dispersant for Heat-Resistant Porous Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium ion secondary batteries face issues with heat resistance during internal short circuits, leading to potential dangers such as swelling, fuming, and explosion, due to the melting of separators with fine pores, which hinders ion movement and battery reliability.
Innovation Solution
A dispersant composition for the separator, comprising a cyanoethyl group-containing polymer with specific repeating units and a heat-resistant porous layer, effectively disperses and adheres inorganic fillers, enhancing the separator's heat resistance and adhesion, thereby improving thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous substrate with fine pores is used as a separator, then ion movement is enabled, but the separator melts at high temperature causing short circuit
Solution Approach 1:
The patent applies composite materials by combining a porous substrate with a heat-resistant porous layer containing inorganic filler particles and cyanoethyl group-containing polymer. This composite structure allows the separator to maintain both ion permeability (from the porous substrate) and heat resistance (from the heat-resistant layer with inorganic filler), resolving the contradiction between reliability and temperature resistance.
2Temperature
If inorganic filler is added to improve heat resistance, then thermal stability increases, but poor dispersibility reduces effectiveness
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight, functional group content, and compositional ratios of the cyanoethyl group-containing polymer to optimize dispersibility. By adjusting these parameters, the patent achieves uniform distribution of inorganic filler particles in the heat-resistant porous layer, ensuring both heat resistance and compositional stability.
Solution Approach 2:
The cyanoethyl group-containing polymer acts as an intermediary substance that facilitates uniform dispersal of inorganic filler particles. The polymer's specific molecular structure and functional groups enable it to interact with both the inorganic filler and the porous substrate, ensuring stable dispersion and preventing agglomeration of filler particles.
3Stability of the object's composition
If dispersant is used to improve inorganic filler dispersibility, then uniform distribution is achieved, but adhesion strength may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight, functional group content, and compositional ratios of the cyanoethyl group-containing polymer. These parameter adjustments enable the dispersant to simultaneously achieve uniform inorganic filler distribution and strong adhesion to the porous substrate, resolving the contradiction between dispersibility and adhesion strength.
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 solution significantly improves the heat resistance and adhesion of the separator, preventing separator shrinkage and melting during short circuits, thus enhancing the safety and reliability of lithium ion secondary batteries.
Implementation Method 1
a cyanoethyl group-containing polymer as a dispersant for evenly dispersing the inorganic substance are used, and sufficient stability of the separator of the battery may be secured when the dispersant maintains dispersibility at an appropriate level
Implementation Method 2
an inorganic substance and a cyanoethyl group-containing polymer as a dispersant for evenly dispersing the inorganic substance are used
Data Source
AI summary
Provided are a dispersant for a separator of a non-aqueous electrolyte battery, the dispersant including a cyanoethyl group-containing polymer, a separator of a non-aqueous electrolyte battery using the same, and a non-aqueous electrolyte battery.