Lithium Battery Anode Binder Sizing for Stronger Electrode Adhesion
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Solution Overview
Problem
Secondary lithium batteries face challenges in achieving good cycle-life characteristics due to inadequate adherence between the anode active material and the current collector, which affects battery performance and energy density.
Innovation Solution
An anode for secondary lithium batteries is designed with an anode active material having a sphericity of 0.83 to 0.91 and a binder with an average particle diameter (D50) of 180 nm to 450 nm, preventing binder penetration and enhancing adherence between the active material layer and the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder is used to provide adherence between active material particles and current collector, then electrode adherence is improved, but binder particles may penetrate into surface gaps of anode active material, reducing effective bonding area
Solution Approach 1:
The invention changes the particle size parameter of the binder from conventional small particles to larger particles with D50 of 180 nm to 450 nm. This parameter change prevents binder penetration into the surface gaps of anode active material while maintaining effective bonding area and adherence, thereby improving cycle-life characteristic
Solution Approach 2:
The invention applies local quality by using larger binder particles specifically designed to match the surface topology of anode active material. The binder particles are sized to sit on surface features rather than penetrate into gaps, creating optimal local bonding conditions at the electrode interface
2Strength
If anode active material with high sphericity (0.83 to 0.91) is used, then electrode adherence and energy density are improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a sphericity parameter range of 0.83 to 0.91 for anode active material particles. This parameter optimization improves electrode adherence and energy density while establishing achievable manufacturing precision thresholds that balance performance with production feasibility
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
This configuration improves electrode adherence, leading to a secondary lithium battery with high energy density and extended cycle-life by increasing the effective bonding area and reducing resistance.
Implementation Method 1
the binder provides adherence of active material particles with one another and adherence between the active material layer and the current collector
Data Source
AI summary
Disclosed are a secondary lithium battery anode and a secondary lithium battery including same, the secondary lithium battery anode comprising a current collector and an anode active material layer located on at least one surface of the current collector, wherein the anode active material layer includes an anode active material, which has sphericity of 0.83 to 0.91, and a binder, which has an average particle diameter (D50) of 180 nm to 450 nm.