Amine-Based Electrode Binder for Secondary Battery Adhesion
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Solution Overview
Problem
Lithium secondary batteries face performance deterioration due to low binding force between electrode active materials and current collectors, leading to increased resistance and reduced capacity, especially at the anode where volume changes cause exfoliation.
Innovation Solution
An electrode binder comprising an amine-based compound and water-based binder particles with carboxyl groups is developed, enhancing adhesion by coupling the amine-based compound to the binder particles, improving dispersibility and bonding force between the electrode active material and current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of binder is increased to prevent exfoliation, then bonding force is improved, but electrical resistance increases and capacity is reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by introducing a specific amine-based compound with polyol structure and reactive amino groups. This chemical parameter change enables the binder to achieve superior bonding force without requiring increased binder quantity, thereby avoiding the electrical resistance problem associated with higher binder amounts.
Solution Approach 2:
The invention creates a composite binder system combining the amine-based compound with water-based binder particles containing carboxyl groups. This composite material approach produces synergistic effects where the amine-based compound provides strong adhesion to both the current collector and active material, while the water-based particles provide binding functionality, achieving high bonding force with minimal binder content.
2Strength
If the amount of binder is increased to prevent exfoliation, then bonding force is improved, but the amount of electrode active material is reduced
Solution Approach 1:
By changing the chemical parameters of the binder to include the amine-based compound with specific functional groups, the invention achieves high bonding force with a small amount of binder material. This allows maximization of active material content while maintaining sufficient adhesion to prevent exfoliation during charge-discharge cycles.
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 bonding force and cycle life characteristics of the battery, reducing exfoliation and maintaining high capacity retention over repetitive charge and discharge cycles.
Implementation Method 1
coupling the amine-based compound to the binder particles, improving dispersibility and bonding force
Implementation Method 2
water-based binder particles including at least one carboxyl group as an end group
Data Source
AI summary
Provided are an electrode binder for a secondary battery including an amine-based compound expressed by Chemical Formula 1 below and water-based binder particles including at least one carboxyl group as an end group, a method of preparing the same, and an electrode for a secondary battery including the electrode binder for a secondary battery