Sulfide Solid Electrolyte Composition for Conductivity and Smooth Sheets
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Solution Overview
Problem
Existing battery technologies face challenges in maintaining ion conductivity and achieving surface smoothness in solid electrolyte compositions, which affects the energy density and safety of batteries.
Innovation Solution
A solid electrolyte composition is developed, comprising a sulfide solid electrolyte, a styrenic elastomer as a binder, and a specific nitrogen-containing organic substance, which improves fluidity, suppresses ion conductivity decrease, and enhances surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid electrolyte compositions are used, then the battery can be manufactured, but the ion conductivity decreases during production and surface smoothness is poor
Solution Approach 1:
The patent introduces a specific nitrogen-containing organic substance as an intermediary additive in the solid electrolyte composition. This substance mediates between the solid electrolyte particles and the binder, improving overall composition uniformity and preventing ion conductivity degradation while simultaneously enhancing surface smoothness during manufacturing processes.
Solution Approach 2:
The patent creates a composite solid electrolyte composition by combining sulfide-based solid electrolyte, styrenic elastomer binder, and nitrogen-containing organic substance. This composite formulation achieves synergistic effects where the nitrogen-containing substance prevents both ion conductivity loss and surface roughness, resolving the contradiction between maintaining functional performance and achieving manufacturing quality.
2Manufacturing precision
If the solid electrolyte composition is optimized for surface smoothness, then surface quality improves, but ion conductivity may be compromised
Solution Approach 1:
The patent modifies the chemical composition parameters of the solid electrolyte system by incorporating a nitrogen-containing organic substance with specific molecular characteristics. This parameter change simultaneously improves surface smoothness during manufacturing and maintains ion conductivity, breaking the traditional trade-off between these two properties.
Solution Approach 2:
The nitrogen-containing organic substance provides local quality enhancement at the interface between solid electrolyte particles and binder, creating regions of improved interaction that simultaneously contribute to both surface smoothness and ion conductivity preservation throughout the bulk material.
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 composition effectively maintains ion conductivity and improves surface smoothness of solid electrolyte sheets, leading to enhanced energy density and safety in battery applications.
Implementation Method 1
an ion conductor including a solid electrolyte, a binder, and a nitrogen-containing organic substance and being dispersed in the solvent
Implementation Method 2
the solid electrolyte includes a sulfide solid electrolyte
Data Source
AI summary
A solid electrolyte composition of the present disclosure includes a solvent and an ion conductor including a solid electrolyte, a binder, and a nitrogen-containing organic substance and being dispersed in the solvent. The solid electrolyte includes a sulfide solid electrolyte, the binder includes a styrenic elastomer, and the nitrogen-containing organic substance is represented by the following compositional formula (1). Where, R1 is a chain alkyl group having 7 or more and 21 or less carbon atoms or a chain alkenyl group having 7 or more and 21 or less carbon atoms, R2 is —CH2—, —CO—, or —NH(CH2)3—, and R3 and R4 are each independently a chain alkyl group having 1 or more and 22 or less carbon atoms, a chain alkenyl group having 2 or more and 22 or less carbon atoms, or hydrogen.