Conductive Adhesive Composition for Electrode Collector
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Solution Overview
Problem
Conductive adhesive agents used in lithium ion batteries face challenges in forming a uniform and strong adhesive layer on metal foil collectors, leading to compromised adhesiveness and electrode strength due to repulsion by the collector surface, particularly in lithium ion secondary batteries which use foil form metal collectors without through holes.
Innovation Solution
A conductive adhesive composition comprising specific particulate copolymers with dibasic acid monomer units and ethylenic unsaturated carboxylic acid amide derivative units, along with conductive carbon and a dispersing medium, is used to improve adhesiveness and uniformity between the collector and electrode composition layer, enhancing electrode strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a usual conductive adhesive agent is coated on a foil form metal collector, then the adhesive agent is repelled by the metal foil surface, but this causes pin holes in the adhesive layer and compromises uniformity and adhesiveness
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive agent by incorporating specific polymers with carboxylic acid groups that can form chemical bonds with the metal collector surface, transforming the adhesive properties to overcome surface repulsion and achieve uniform coating without pin holes
Solution Approach 2:
The patent uses a composite adhesive composition containing multiple components including conductive carbon particles, polymers with carboxylic acid groups, and other additives, combining the benefits of conductivity, adhesion, and uniformity that individual materials cannot achieve alone
2Loss of energy
If the conductive adhesive layer is provided between the electrode composition layer and the collector, then the inner resistance is reduced, but the adhesive layer uniformity and adhesiveness are compromised due to collector surface repulsion
Solution Approach 1:
The patent modifies the chemical and physical parameters of the adhesive composition to include polymers with specific functional groups that enhance both adhesion to the collector and uniformity of the layer, allowing the conductive adhesive to maintain low inner resistance while achieving reliable bonding
Solution Approach 2:
The conductive adhesive layer acts as an intermediary between the collector and electrode composition layer, with its specially formulated composition enabling it to bridge the interface effectively, reducing resistance while maintaining strong adhesion through chemical bonding mechanisms
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 use of these particulate copolymers results in a smooth and strong conductive adhesive layer with improved adhesiveness to the collector, leading to increased electrode strength and durability of lithium ion secondary batteries by ensuring better contact and conductivity.
Implementation Method 1
improve the adhesiveness between the collector and the electrode composition layer by having the conductive adhesive layer in between
Implementation Method 2
The conductive adhesive agent of the patent document 1 includes the carbon black as the conductive material
Data Source
AI summary
To provide a conductive adhesive composition for an electrochemical element electrode and used in forming a conductive adhesive layer that is highly uniform and is interposed between a collector and an electrode composition layer, being able to contribute to increased adhesion between the two. The conductive adhesive composition for an electrochemical element electrode is characterized by containing: conductive carbon; a particulate copolymer (A) containing a dibasic acid monomer unit; a particulate copolymer (B) containing an ethylenically unsaturated carboxylic acid amide derivative unit; and a dispersing agent.