LGPS-Like Solid Electrolyte Composition for High Ion Conductivity

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Solution Overview

Problem

Existing solid electrolytes in all-solid-state lithium batteries do not achieve the desired high ion conductivity required for improved charge/discharge capacity.

Innovation Solution

A Li-P-Sn-S-X-based solid electrolyte material is developed, incorporating an LGPS-like crystal phase with specific blending ratios of Li3PS4, Li4SnS4, and LiX, manufactured through a process involving mixing, amorphization, and heat treatment to enhance ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LGPS-based solid electrolyte with SnS2 is used, then ion conductivity is improved, but the manufacturing process becomes complex

Engineering Contradiction:

Improveion conductivityVSAvoidsynthesis process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention applies preliminary action by pre-mixing the raw materials (Li2S, P2S5, SnS2, and LiX) in precise molar ratios according to the formula (Li3PS4)a(Li4SnS4)b(LiX)c before sintering. This pre-mixing step ensures homogeneous distribution of components, facilitating the formation of the desired LGPS-like crystal phase during sintering at 200-300°C, thereby simplifying the overall manufacturing process while achieving high ion conductivity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention simplifies manufacturing by optimizing the sintering temperature parameter to a relatively low range of 200-300°C, which is lower than conventional LGPS synthesis temperatures. This parameter change, combined with the specific compositional formula containing halide elements, enables the formation of high-ion-conductivity materials with excellent crystallinity through a simplified single-step sintering process

Inventive Principle:

Principle #35Parameter changes

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 new solid electrolyte material exhibits excellent ionic conductivity, supporting higher performance in all-solid-state lithium batteries.

Implementation Method 1

a solid electrolyte material including an LGPS-like crystal phase and exhibiting excellent ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

a heat treatment step of heat-treating an amorphous body obtained in the amorphization step

Methodology Applied

Scientific EffectCrystallization: Crystallisation

Data Source

PatentEP4693341A1Solid electrolyte material, solid electrolyte composite, electrode, and method for producing solid electrolyte material

Publication Date: 2026.02.11 PUBLIC UNIVERSITY CORPORATION OSAKA CITY UNIVERSITY

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AI summary

An object is to provide a solid electrolyte material exhibiting a high ion conductivity. The object is achieved by a solid electrolyte material including an LGPS-like crystal phase represented by: (Li3PS4)a(Li4SnS4)b(LiX)c (I) (wherein a > 0; b > 0; c > 0; a + b + c = 1.0; 2.0 ≤ a/b ≤ 9.0; c/(a + b) ≥ 0.20, and X represents Cl, Br or I).