Electrode Slurry Dispersant Composition for High Active Material Loading
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Solution Overview
Problem
Increasing the content of electrode active material in a slurry for forming an electrode leads to reduced fluidity and difficulty in uniform coating, affecting the performance of non-aqueous electrolytic solution secondary batteries.
Innovation Solution
A slurry containing an electrode active material, conductive auxiliary agent, and non-aqueous electrolytic solution, enhanced with a dispersant polymer having specific molecular weight and compositional ratios, improves fluidity and handleability, ensuring uniform coating even with high active material content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of electrode active material in the slurry is increased to further increase battery capacity and energy density, then the charge capacity and entire energy density can be significantly increased, but the fluidity of the slurry is reduced and it becomes difficult to carry out uniform coating
Solution Approach 1:
The patent introduces a specific dispersant as an intermediary substance to mediate between the electrode active material particles and the slurry medium. This dispersant maintains fluidity even when active material content is high (60-90 mass%), enabling uniform coating while preserving the high capacity benefits. The dispersant acts as a lubricating and separating agent between particles, preventing aggregation and maintaining slurry flowability.
Solution Approach 2:
The patent changes the chemical composition parameters of the slurry by incorporating a dispersant with specific molecular weight (1,000-15,000) and functional groups. This parameter change allows the slurry to maintain appropriate viscosity and fluidity characteristics despite the high solid content, transforming the slurry properties to enable both high active material loading and good coating uniformity.
2Quantity of substance
If the content of electrode active material in the slurry is increased to further increase battery capacity, then the charge capacity can be significantly increased, but the performance of the obtained semi-solid-state secondary battery tends to be easily varied and battery performance tends to be deteriorated
Solution Approach 1:
The dispersant serves as a stabilizing intermediary that ensures consistent distribution of electrode active material particles throughout the slurry. This mediation prevents particle aggregation and ensures uniform coating thickness and composition, thereby maintaining reliable and consistent battery performance even at high active material contents where performance variation would otherwise occur.
Solution Approach 2:
By optimizing the dispersant concentration and molecular weight parameters, the patent achieves a slurry formulation that maintains stable rheological properties. This parameter optimization ensures reproducible coating quality and battery performance across production batches, preventing the performance variability that typically occurs with high solid-content slurries.
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 ensures improved fluidity and manufacturing suitability, resulting in enhanced performance of non-aqueous electrolytic solution secondary batteries with a slurry-like electrode active material layer.
Implementation Method 1
a dispersant, in which the dispersant consists of a polymer having a weight-average molecular weight of 1,000 to 15,000
Data Source
AI summary
Provided is a slurry for forming an electrode containing an electrode active material, a conductive auxiliary agent, a non-aqueous electrolytic solution, and a dispersant, in which the dispersant consists of a polymer having a weight-average molecular weight of 1,000 to 15,000, the polymer containing 80% to 99% by mass of a constitutional component represented by Formula (1) and 1% to 20% by mass of constitutional components represented by Formulae (2) and (3) in total.In the formulae,* represents a linking site,R1 represents a hydrocarbon group having 1 to 8 carbon atoms,R2 to R6 represent a hydrogen atom or methyl,R7 represents a hydrocarbon group having 5 to 18 carbon atoms,R1 represents a group which has 1 to 12 carbon atoms and has a nitrogen atom, andn is a number of 3 to 30.