Lithium-Ion Battery Anode Expansion Control via Current Collector Tensile Strength
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Solution Overview
Problem
Silicone-based anode materials in lithium-ion batteries experience significant volume expansion during charging and discharging, leading to short battery life, high production costs, reduced manufacturing yield, and complex manufacturing processes, which existing solutions have not adequately addressed.
Innovation Solution
A method for manufacturing a lithium-ion battery anode that involves preparing a copper electrode current collector and applying a silicone-based electrode slurry, with controlled drying to adjust the tensile strength of the current collector, allowing for controlled expansion directionality of the anode material during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicone-based anode material is used to increase battery capacity, then battery capacity is improved, but volume expansion during charging causes short battery life
Solution Approach 1:
The patent changes the physical parameters of the current collector by controlling its tensile strength (20-30 kgf/mm²) and thickness (5-20 μm), which fundamentally alters how the anode structure responds to expansion forces, enabling silicone material to expand without destroying the electrode
Solution Approach 2:
The patent creates a composite structure where the current collector and anode material work together as an integrated system. The specifically designed current collector acts as a flexible substrate that accommodates silicone expansion, forming a composite that combines high capacity with structural stability
2Strength
If binder with enhanced adhesion is applied to control expansion, then adhesion is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the expansion control function from the binder material and transfers it to the current collector structure. By designing the current collector with appropriate tensile strength and thickness, the system achieves expansion control without relying on expensive specialized binders
Solution Approach 2:
The patent uses a simple, cost-effective current collector design that can be manufactured through standard processes. The focus shifts to optimizing the current collector parameters rather than investing in expensive binder materials, reducing overall manufacturing cost
3Stability of the object's composition
If graphite and silicone materials are blended to control expansion, then expansion control is improved, but material development complexity increases
Solution Approach 1:
The patent applies local quality by creating a gradient or non-uniform structure in the anode, where the current collector has specifically engineered local properties (tensile strength, thickness) that differ from standard designs. This localized optimization controls expansion without requiring complex bulk material formulations
4Stability of the object's composition
If current collector tensile strength is adjusted to control expansion directionality, then expansion control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent identifies and controls key parameters of the current collector (tensile strength, thickness) that directly influence expansion behavior. By establishing specific parameter ranges (tensile strength: 20-30 kgf/mm², thickness: 5-20 μm), the system achieves expansion control through parameter optimization rather than complex manufacturing processes
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 approach prevents anode material expansion issues, improves lithium-ion battery life, and reduces production costs by stabilizing the anode material's expansion, ensuring it expands more in the surface direction than the thickness direction, thereby maintaining structural integrity and extending battery lifespan.
Implementation Method 1
drying the electrode slurry and the electrode current collector
Implementation Method 2
the anode material, which expands during charging
Data Source
AI summary
The present invention relates to a method for manufacturing an anode of a lithium-ion battery capable of controlling an expansion directionality of an anode material whose volume expands by charging, and a lithium-ion battery including the anode manufactured by the method. More specifically, the present invention provides a method capable of improving the life of a lithium-ion battery by adjusting the tensile strength of a current collector and thus controlling the expansion directionality of an anode material, which expands during charging.