Carbon Anode Oxygen Content for Battery Adhesion
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Solution Overview
Problem
Current secondary batteries face challenges in maintaining high capacity while ensuring adhesion between active material and current collector, and between active material particles, often requiring increased binder amounts which can reduce active material content.
Innovation Solution
A negative electrode with a high oxygen content of 700 mg/kg to 1,700 mg/kg in carbon-based particles enhances adhesion between the active material and current collector, and between active material particles, allowing for reduced binder usage and increased active material content, thereby improving battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of binder is increased to improve adhesion between active material and current collector, then adhesion is improved, but the amount of active material particles is reduced and capacity is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the carbon-based particles by controlling the oxygen content within a specific range (700-1700 mg/kg). This parameter modification enables the carbon particles themselves to provide sufficient adhesion, eliminating the need to increase binder content and thus preserving active material quantity and capacity.
2Strength
If the ratio of binder is increased to secure adhesion between active material particles, then adhesion is improved, but the amount of active material particles is reduced and capacity is reduced
Solution Approach 1:
By modifying the oxygen content parameter of carbon-based particles to within 700-1700 mg/kg, the particles develop inherent adhesive properties that enable them to bond with each other effectively. This eliminates the need to increase binder ratio, thereby maintaining high active material content and capacity.
3Quantity of substance
If the amount of active material particles is increased to improve capacity, then capacity is improved, but adhesion between active material and current collector deteriorates
Solution Approach 1:
The patent optimizes the oxygen content parameter of carbon-based particles to provide sufficient adhesion, which allows increasing the amount of active material particles without compromising adhesion. The modified carbon particles serve dual functions as both active material and adhesive agent.
4Quantity of substance
If the amount of active material particles is increased to improve capacity, then capacity is improved, but adhesion between active material particles deteriorates
Solution Approach 1:
By controlling the oxygen content of carbon-based particles within 700-1700 mg/kg, the particles acquire enhanced surface properties that improve inter-particle adhesion. This enables high active material content to be maintained while ensuring sufficient adhesion between particles.
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 high oxygen content in carbon-based particles improves adhesion, enabling higher battery capacity and reduced resistance, while maintaining efficient charge and discharge cycles.
Implementation Method 1
adhesion between active material and current collector and adhesion between active material particles may be improved due to a high oxygen content of carbon-based particles
Implementation Method 2
the adhesion between the active material and the current collector and the adhesion between the active material particles may be secured even if the amount of a binder is reduced
Data Source
AI summary
The present invention relates to a negative electrode including an active material layer which includes carbon-based particles having an oxygen content of 700 mg/kg to 1,700 mg/kg, and a secondary battery including the same.