Patterned Organic Anode Substrate for Silicon Battery Cycle Stability
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Solution Overview
Problem
Current anode materials in batteries fail to achieve a balance between high output voltage, energy density, and superior charge and discharge cycle characteristics, often experiencing deformation and detachment issues due to the expansion and contraction of silicon anode materials during lithium storage.
Innovation Solution
An anode substrate is developed with a patterned organic film formed using thermal or photoimprint processes, onto which a metal film is deposited, providing a structure that enhances adhesion and stress relaxation, thereby improving cycle stability and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a silicon thin film is used as an anode material to achieve high energy density, then the battery capacity increases, but the anode material undergoes expansion and contraction during charging and discharging, causing deformation and detachment that deteriorate charge and discharge cycle characteristics
Solution Approach 1:
The patent employs a flexible polymer film as the collector instead of a rigid metal foil. This flexible film can elastically deform to accommodate the expansion and contraction of the silicon anode material during lithium insertion and extraction, preventing deformation and detachment while maintaining structural integrity throughout charge and discharge cycles
Solution Approach 2:
The patent uses a composite structure consisting of a polymer collector with specific mechanical properties combined with a silicon-based anode material layer. The polymer collector provides mechanical flexibility and adhesion, while the silicon layer provides high capacity, creating a composite system that resolves the contradiction between capacity and cycle stability
2Power
If a metal foil with high ductility such as copper foil is used as a collector to provide good electrical conductivity, then the electrical performance improves, but the degree of deformation increases during anode expansion and contraction, leading to shriveling and detachment
Solution Approach 1:
The patent replaces the rigid copper foil with a flexible polymer film that has appropriate mechanical properties including elasticity and tensile strength. This flexible film can dynamically adapt its shape during silicon expansion and contraction, preventing the shriveling and detachment problems associated with rigid metal collectors while maintaining sufficient electrical conductivity
3Strength
If a material with superior mechanical strength such as high tensile strength and elastic modulus is used as a collector to inhibit deformation, then the structural stability improves, but the adhesion between the collector and the anode material layer becomes insufficient, causing detachment
Solution Approach 1:
The patent carefully selects and optimizes the mechanical parameters of the polymer collector, including its tensile strength, elastic modulus, and flexibility. By adjusting these parameters to specific ranges, the polymer film achieves both sufficient mechanical strength to resist deformation and adequate flexibility to maintain strong adhesion with the silicon anode material during volume changes
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 anode substrate achieves a battery with high output voltage and energy density while maintaining superior charge and discharge cycle characteristics by mitigating stress-induced deformation and detachment through the use of a patterned organic film and metal film combination.
Implementation Method 1
a patterned organic film formed by molding with a thermal imprint process or a photoimprint process
Implementation Method 2
a patterned organic film formed by molding with a thermal imprint process or a photoimprint process
Implementation Method 3
a patterned organic film formed by molding with a thermal imprint process or a photoimprint process, and further having a metal film formed thereon
Data Source
AI summary
An anode substrate which enables achievement of a battery having a high output voltage and a high energy density, and being superior in charge and discharge cycle characteristics; a secondary cell in which the anode substrate is used; a resin composition for use in forming the anode substrate; and a method for producing the anode substrate are provided. According to anode substrate 10 including metal film 13 formed on support 11 provided with patterned organic film 12 molded by a thermal imprint process or a photoimprint process, a battery having a high output voltage and a high energy density, and being superior in charge and discharge cycle characteristics can be provided.