Solid Electrolyte Design for High-Conductivity Batteries
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Summary
Problems
Solid electrolytes like LaLiTiO, when in a powder state, exhibit high intergranular resistance and low ionic conductivity, leading to high internal resistance and inadequate output characteristics in all-solid-state secondary batteries, which worsens with high-temperature sintering that can cause electrode decomposition.
Innovation solutions
A solid electrolyte with a surface-modified structure, achieved through hydrogen heat treatment, sulfurization, and surface oxidation, reduces intergranular resistance and enhances ionic conductivity without high-temperature sintering, using a composition like La0.55Li0.33TiO3 with sulfur coupled to an oxygen-deficient portion, allowing compaction molding at room temperature.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If high-temperature sintering is performed to reduce intergranular resistance, then ionic conductivity between particles is improved, but electrode material suffers from decomposition and solid solution
Why choose this principle:
The solid electrolyte surface is preliminarily modified through hydrogen heat treatment to create an oxygen-deficient portion, followed by sulfurization to form a sulfur-containing layer. This preliminary surface treatment reduces intergranular resistance before battery assembly, eliminating the need for high-temperature sintering that would decompose electrode materials.
Principle concept:
If high-temperature sintering is performed to reduce intergranular resistance, then ionic conductivity between particles is improved, but electrode material suffers from decomposition and solid solution
Why choose this principle:
The invention changes the chemical composition parameters of the solid electrolyte surface by introducing sulfur through controlled sulfurization. This parameter change (adding sulfur to create oxygen-deficient regions) fundamentally alters the intergranular resistance characteristics, enabling low resistance without high-temperature processing.
Application Domain
Data Source
AI summary:
A solid electrolyte with a surface-modified structure, achieved through hydrogen heat treatment, sulfurization, and surface oxidation, reduces intergranular resistance and enhances ionic conductivity without high-temperature sintering, using a composition like La0.55Li0.33TiO3 with sulfur coupled to an oxygen-deficient portion, allowing compaction molding at room temperature.
Abstract
A solid electrolyte (3) includes a particle (3X) having a first portion (3A) that includes, as constituent elements, lanthanum (La), lithium (Li), titanium (Ti) and oxygen (O), and a second portion (3B) that covers a surface of the first portion and includes, as constituent elements, lanthanum (La), lithium (Li), titanium (Ti) and oxygen (O) and in which sulfur (S) is coupled to an oxygen deficient portion and at least a surface (3C) is oxidized.