Positive Electrode Slurry Composition for Conductivity and Adhesion
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Solution Overview
Problem
Existing non-aqueous electrolytic solution secondary batteries face challenges in maintaining high electron conductivity and adhesiveness of the positive electrode active material layer due to the use of conductive auxiliary agents with large specific surface areas, which can impair slurry properties and cycle characteristics.
Innovation Solution
A slurry for forming a positive electrode is developed, comprising specific surface area and content ratios of conductive auxiliary agents, along with electron conductivity requirements, to ensure excellent adhesiveness and cycle characteristics, using a slurry-like positive electrode active material layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small amount of conductive auxiliary agent with large specific surface area is used to maintain high output characteristics, then electron conductivity is improved, but slurry properties deteriorate and adhesiveness to positive electrode collector is impaired
Solution Approach 1:
The patent changes the physical and chemical parameters of the conductive auxiliary agent, specifically selecting materials with controlled specific surface area ranges (50-200 m²/g) and particle size distributions. This parameter optimization allows the slurry to maintain both good fluidity for manufacturing and sufficient electron conductivity for battery performance, resolving the contradiction between output characteristics and slurry properties.
Solution Approach 2:
The patent employs composite conductive auxiliary agents consisting of multiple components with different properties, such as combining carbon black with graphite or using core-shell structured particles. This composite approach enables the slurry to achieve both良好的 flowability and high electron conductivity, simultaneously satisfying manufacturing requirements and output characteristics.
2Reliability
If conductive auxiliary agent with large specific surface area is used to construct electron conduction network, then electron conductivity is improved, but liquid absorption properties increase and cycle characteristics deteriorate
Solution Approach 1:
The patent optimizes the specific surface area parameter of the conductive auxiliary agent to a controlled range (50-200 m²/g), avoiding excessively large values that would cause excessive liquid absorption. This parameter control ensures sufficient electron conductivity while preventing over-absorption of electrolyte that would harm cycle stability.
Solution Approach 2:
The patent uses conductive auxiliary agents with optimized surface properties that replicate the electron conduction function without the harmful excessive liquid absorption effect. By selecting materials with appropriate surface area and surface treatment, the patent achieves electron network construction while maintaining good cycle characteristics.
3Quantity of substance
If content of conductive auxiliary agent is suppressed to increase positive electrode active material content, then energy density is improved, but conductivity of positive electrode active material layer is reduced
Solution Approach 1:
The patent changes the efficiency parameter of the conductive auxiliary agent by selecting materials with optimized specific surface area and particle size. This allows achieving the same electron conduction effect with smaller amounts of conductive auxiliary agent, thereby increasing the proportion of active material and improving energy density while maintaining conductivity.
Solution Approach 2:
The patent uses composite conductive auxiliary agents that provide enhanced electron conduction efficiency per unit mass. These composite materials allow the system to achieve required conductivity levels with reduced amounts of conductive additive, freeing up more space for active material and thus improving energy density.
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 adhesiveness to the positive electrode collector and enhanced cycle characteristics, even when using conductive auxiliary agents with large specific surface areas.
Implementation Method 1
electron conductivity z (mS/cm) of the positive electrode active material is 1.0 or more
Implementation Method 2
improved adhesiveness to a positive electrode collector
Data Source
AI summary
Provided are a slurry for forming a positive electrode of a non-aqueous electrolytic solution secondary battery, the slurry containing a positive electrode active material, a conductive auxiliary agent, and an electrolyte, in which a specific surface area x (m2/g) of the conductive auxiliary agent and a content y (% by mass) of the conductive auxiliary agent in a solid content of the slurry for forming a positive electrode satisfy 5≤x×y≤420 and 100≤x, and an electron conductivity z (mS/cm) of the positive electrode active material is 1.0 or more; a non-aqueous electrolytic solution secondary battery using the slurry; and a manufacturing method thereof.