Battery Electrode Slurry Composition for Stable High-Solid Dispersion
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Solution Overview
Problem
Existing non-aqueous electrolytic solution secondary batteries face challenges in achieving high energy density, dispersion stability, and manufacturing efficiency due to issues with slurry viscosity, aggregation, and conductivity, particularly when using conductive auxiliary agents with high specific surface areas.
Innovation Solution
A slurry formulation for electrode formation in non-aqueous electrolytic solution secondary batteries is developed, balancing the liquid absorption amount, BET specific surface area, and surface free energy differences of the conductive auxiliary agent, along with controlled concentrations of electrode active material and conductive auxiliary agent, to enhance dispersion stability, drying properties, and coating suitability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of conductive auxiliary agent is reduced to increase active material content, then energy density is improved, but output characteristics deteriorate due to insufficient conductivity
Solution Approach 1:
The patent changes the physical and chemical parameters of the conductive auxiliary agent, specifically using agents with high specific surface area (170 m²/g or more) and controlling their liquid absorption amount and surface free energy to maintain conductivity with reduced content
Solution Approach 2:
The patent creates a composite slurry system combining active material, conductive auxiliary agent with specific properties, and dispersion medium to achieve both high energy density and output characteristics through synergistic effects
2Productivity
If the concentration of solid contents in the slurry is increased to improve manufacturing efficiency, then productivity is improved, but dispersion stability deteriorates due to increased viscosity and aggregation
Solution Approach 1:
The patent changes the parameters of the dispersion medium, specifically selecting materials with controlled surface free energy (20-40 mN/m) and liquid absorption characteristics to maintain low viscosity and stable dispersion at high solid content concentrations
Solution Approach 2:
The dispersion medium acts as an intermediary between solid particles, with its specific surface free energy and liquid absorption properties mediating the interaction to prevent aggregation and maintain stability
3Power
If a conductive auxiliary agent with high specific surface area is used to improve conductivity, then output characteristics are improved, but aggregation occurs and dispersion stability deteriorates
Solution Approach 1:
The patent changes the parameters of the conductive auxiliary agent by selecting materials with high specific surface area (170 m²/g or more) while simultaneously controlling their liquid absorption amount (200-1700 mL/100g) and surface free energy to balance conductivity and dispersion stability
Solution Approach 2:
The patent applies local quality by giving specific surface area and surface free energy characteristics to the conductive auxiliary agent, creating localized conductive networks while maintaining overall dispersion stability through controlled surface properties
4Ease of operation
If the liquid absorption amount of the dispersion medium is increased to improve handleability, then ease of operation is improved, but manufacturing precision deteriorates due to excessive solvent content affecting drying time and uniformity
Solution Approach 1:
The patent changes the liquid absorption amount parameter of the dispersion medium to a specific range (200-1700 mL/100g of total solid contents) that balances handleability with drying performance and uniformity
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 slurry enables the production of non-aqueous electrolytic solution secondary batteries with improved manufacturing efficiency, uniform electrode layers, and enhanced battery performance by ensuring stable dispersion and quick drying, thereby increasing energy density and output characteristics.
Implementation Method 1
x is a liquid absorption amount (mL) of the dispersion medium per 100 g of a total of the electrode active material and the conductive auxiliary agent in the slurry for forming an electrode
Implementation Method 2
In this case, in order to improve a manufacturing efficiency, it is required to control characteristics of the slurry for forming an electrode from various angles... in order to shorten manufacturing time, the slurry for forming an electrode is required to be capable of being quickly dried after coating
Data Source
AI summary
Provided are a slurry for forming an electrode of a non-aqueous electrolytic solution secondary battery, containing an electrode active material, a conductive auxiliary agent, and a dispersion medium, and satisfying the following expressions (1) to (4); a non-aqueous electrolytic solution secondary battery using the slurry; and a manufacturing method thereof.0<y-x≤10Expression (1)0≤x≤30Expression (2)SBET≥170Expression (3)ΔE≤30Expression (4)x: a liquid absorption amount (mL) of the dispersion medium per 100 g of the total of the electrode active material and the conductive auxiliary agenty: an amount (mL) of the dispersion medium per 100 g of the total of the electrode active material and the conductive auxiliary agentSBET: a BET specific surface area (m2/g) of the conductive auxiliary agentΔE: an absolute value (mN/m) of a difference between a surface free energy of the dispersion medium and a surface free energy of the conductive auxiliary agent