Organic Fiber Electrode Layer for Battery Separator
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Solution Overview
Problem
Nonaqueous electrolyte batteries face challenges in achieving high energy density and excellent input-and-output characteristics due to the trade-off between separator thickness and porosity, where reducing thickness increases porosity but also reduces tensile strength, and increasing porosity for damage resistance decreases energy density and resistance.
Innovation Solution
An electrode with an organic fiber-containing layer is developed, where the layer has a specific thickness ratio and impregnation characteristics in wet and dry states, allowing for a thin, high-porosity separator that maintains strength and reduces resistance to lithium ion movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the separator thickness is reduced to increase porosity, then the porosity increases, but the tensile strength decreases
Solution Approach 1:
The invention changes the physical and chemical parameters of the separator by controlling the ratio of thickness in wet state to thickness in dry state (tW/tD) within a specific range of 1.1 to 2.55, and controlling the impregnation amount of liquid electrolyte to be 500 mg or more per 1 cm³. These parameter changes enable the separator to achieve both high porosity and sufficient tensile strength, resolving the contradiction between porosity improvement and strength maintenance.
2Quantity of substance
If the separator thickness is reduced to increase porosity, then the porosity increases, but the energy density decreases
Solution Approach 1:
By optimizing the tW/tD ratio within 1.1 to 2.55 and controlling the liquid electrolyte impregnation amount to be 500 mg or more per 1 cm³, the invention achieves a separator structure that maximizes porosity while minimizing thickness loss, thereby improving energy density without sacrificing porosity benefits.
3Object-generated harmful factors
If the separator porosity is increased to reduce resistance, then the resistance to lithium ion movement decreases, but the damage resistance decreases
Solution Approach 1:
The invention resolves this contradiction by precisely controlling the tW/tD ratio within 1.1 to 2.55 and the liquid electrolyte impregnation amount to be 500 mg or more per 1 cm³. This creates an optimized pore structure that reduces resistance to lithium ion movement while maintaining sufficient mechanical strength for damage resistance.
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 electrode achieves a nonaqueous electrolyte battery with enhanced energy density and input-and-output characteristics by maintaining strength while increasing porosity and reducing resistance, thus extending the cruising distance and acceleration performance of electric vehicles.
Implementation Method 1
The organic fiber-containing layer in the wet state is impregnated with a liquid electrolyte of 500 mg or more per 1 cm³
Data Source
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AI summary
The electrode according to an embodiment includes an electrode layer and an organic fiber-containing layer. The organic fiber-containing layer is provided on the electrode layer. The organic fiber-containing layer includes an organic fiber. The organic fiber-containing layer has a ratio tW/tD within a range of 1.1 to 2.55, where tW is a thickness [µm] in a wet state and tD is a thickness [µm] in a dry state. A ratio dW/dD is within a range of 0.95 to 1.05, where dW is an average fiber diameter [nm] of the organic fiber included in the organic fiber-containing layer in the wet state, and dD is an average fiber diameter [nm] of the organic fiber included in the organic fiber-containing layer in the dry state.