Solid Electrolyte Composition With Nitrogen-Controlled Styrene Binder

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Solution Overview

Problem

The dispersibility of solid electrolytes in compositions containing styrene elastomers as binders is compromised when the total nitrogen content of the styrene elastomer exceeds 130 ppm, leading to reduced ionic conductivity and energy density in batteries.

Innovation Solution

A solid electrolyte composition is developed with a solvent and an ionic conductor containing a solid electrolyte and a binder, where the binder is a styrene elastomer with a total nitrogen content of 30 ppm or more and 130 ppm or less, improving the interaction and dispersibility of the solid electrolyte.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the total nitrogen content of the styrene elastomer is increased to improve binder performance, then the binding ability is enhanced, but the dispersibility of solid electrolyte deteriorates when nitrogen content exceeds 130 ppm

Engineering Contradiction:

Improvebinder performanceVSAvoiddispersibility of solid electrolyte

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by precisely controlling the total nitrogen content of the styrene elastomer within the range of 30 ppm or more and 130 ppm or less. This quantitative parameter control optimizes the balance between binder performance and solid electrolyte dispersibility, resolving the contradiction by identifying the critical nitrogen content threshold that maintains both binding ability and dispersibility.

Inventive Principle:

Principle #35Parameter changes

2Force

If the nitrogen content in styrene elastomer is increased, then the interaction with solid electrolyte is enhanced, but the ionic conductivity decreases when nitrogen content exceeds 130 ppm

Engineering Contradiction:

Improveinteraction between binder and solid electrolyteVSAvoidionic conductivity

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The patent resolves this contradiction by controlling the nitrogen content parameter within the specific range of 30-130 ppm. This parameter optimization ensures sufficient interaction between the binder and solid electrolyte while preventing excessive nitrogen content from degrading ionic conductivity, thereby maintaining reliable battery performance.

Inventive Principle:

Principle #35Parameter changes

3Strength

If the nitrogen content in styrene elastomer is increased, then the binding ability is improved, but the energy density decreases when nitrogen content exceeds 130 ppm

Engineering Contradiction:

Improvebinding abilityVSAvoidenergy density

Core Design Contradiction:

StrengthVSQuantity of substance

Solution Approach 1:

The patent applies parameter changes by limiting the nitrogen content to 30 ppm or more and 130 ppm or less, which optimizes the binding ability while preventing excessive nitrogen from reducing energy density. This parameter control ensures that the binder provides sufficient adhesion without compromising the overall energy density of the battery.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250030046A1Solid electrolyte composition, electrode composition, method for producing solid electrolyte sheet, method for producing electrode sheet, and method for producing battery

Publication Date: 2025.01.23 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A solid electrolyte composition according to the present disclosure contains a solvent and an ionic conductor containing a solid electrolyte and a binder and dispersed in the solvent, wherein the binder contains a styrene elastomer, and the styrene elastomer has a total nitrogen content of 30 ppm or more and 130 ppm or less.