Battery Adhesive Layer Composition for Adhesion and Blocking Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-aqueous secondary batteries face challenges in achieving both high process adhesiveness and blocking resistance during the production process, particularly as batteries increase in size, with existing adhesive layers not adequately addressing misalignment and productivity issues.
Innovation Solution
A composition for the adhesive layer comprising two types of particulate polymers with specific glass-transition temperatures and volume-average particle diameters is used, where one polymer has a glass-transition temperature no higher than 20°C and the other at least 30°C, along with a volume-average particle diameter ratio, to enhance both process adhesiveness and blocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is provided on battery members to improve adhesiveness, then the adhesiveness between battery members is improved, but blocking occurs during storage and transportation causing defects and reduced productivity
Solution Approach 1:
The patent applies parameter changes by controlling the glass-transition temperature of the particulate polymer within a specific range (-60°C to 20°C) and adjusting the particle diameter (300-700 nm). These parameter optimizations enable the adhesive layer to maintain appropriate adhesiveness while preventing blocking during storage and transportation.
Solution Approach 2:
The patent uses composite materials by combining particulate polymer with glass-transition temperature in the range of -60°C to 20°C and particulate polymer with glass-transition temperature in the range of 60°C to 150°C. This composite adhesive composition achieves both sufficient adhesiveness and blocking resistance.
2Quantity of substance
If battery members are made larger to increase capacity, then energy density is improved, but process adhesiveness during production deteriorates leading to misalignment and reduced productivity
Solution Approach 1:
The patent applies parameter changes by optimizing the glass-transition temperature range (-60°C to 20°C for first particulate polymer, 60°C to 150°C for second particulate polymer) and particle diameter (300-700 nm) to ensure adequate process adhesiveness even for larger battery members during production processes.
Solution Approach 2:
The patent applies local quality by providing an adhesive layer specifically at the interfaces between battery members where adhesion is needed, rather than uniformly across all surfaces. This targeted approach maintains process adhesiveness for larger batteries without affecting overall productivity.
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 effectively improves the adhesiveness and blocking resistance of battery members, leading to better cell characteristics and productivity in non-aqueous secondary battery production, particularly at low temperatures.
Implementation Method 1
a particulate polymer A having a glass-transition temperature of no higher than 20°C and a volume-average particle diameter of at least 100 nm and less than 450 nm, and a particulate polymer B having a glass-transition temperature of at least 30°C and no higher than 55°C
Data Source
AI summary
Provided is a composition for an adhesive layer of a non-aqueous secondary battery allowing formation of an adhesive layer that can achieve both high process adhesiveness and high blocking resistance in battery members such as an electrode and a separator. The presently disclosed composition for an adhesive layer of a non-aqueous secondary battery includes a particulate polymer A that has a glass-transition temperature of no higher than 20°C and a volume-average particle diameter of at least 100 nm and less than 450 nm, and a particulate polymer B that has a glass-transition temperature of at least 30°C and less than 60°C and a volume-average particle diameter larger than the volume-average particle diameter of the particulate polymer A.