Halide Sulfide Solid Electrolyte for Low-Temperature Crystallization

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current lithium solid-state battery technologies face challenges with low conductivity and high temperature requirements for iodine-containing solid electrolytes, which increase manufacturing complexity and cost.

Innovation Solution

A solid electrolyte material comprising elements Li, T, X, and A, where T is selected from P, As, Si, Ge, Al, Sb, W, and B, X is selected from F, Cl, Br, I, and N, and A is S or Se, with specific X-ray diffraction peaks, is developed, allowing for the formation of glass ceramic and mixed crystalline phases with improved conductivity and reduced manufacturing complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high temperature (500° C.) heat treatment is applied to obtain crystalline material of high conductivity, then ionic conductivity is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveionic conductivityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the thermal processing parameters from conventional high-temperature (500°C) treatment to modest low-temperature treatment, achieving crystallization and high ionic conductivity at significantly reduced temperatures. This parameter change in the heat treatment process simplifies manufacturing while maintaining or improving conductivity performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention performs preliminary compositional optimization during the material synthesis stage, pre-configuring the electrolyte composition to facilitate low-temperature crystallization. By preparing the material with appropriate precursor ratios and chemical composition beforehand, the subsequent heat treatment requires only modest temperature exposure to achieve the desired crystalline structure and conductivity

Inventive Principle:

Principle #10Preliminary action

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 achieves high ionic conductivity at room temperature with modest heat treatment, enabling more efficient and cost-effective production of solid-state batteries.

Implementation Method 1

the most common iodine-containing solid electrolyte (Li6PS5I) has low conductivity (1E-4 mS/cm at room temperature)

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

common electrolytes for electrochemical cells, such as those from the Argyrodite family, require a high temperature (500° C.) heat treatment to obtain crystalline material of high conductivity

Methodology Applied

Scientific EffectCrystallization: Crystallisation

Implementation Method 3

Boulineau, S.; Courty, M.; Tarascon, J.-M.; Viallet, V. Mechanochemical Synthesis of Li-Argyrodite Li6PS5X (X=Cl, Br, I) as Sulfur-Based Solid Electrolytes for All Solid State Batteries Application. Solid State Ionics 2012, 221, 1-5

Methodology Applied

Scientific EffectSolid-state reaction: Chemical Bonding

Data Source

PatentUS20240186570A1Bromine and iodine lithium phosphorous sulfide solid electrolyte and solid-state battery including the same

Publication Date: 2024.06.06 SOLID POWER OPERATING INC

AI summary

A solid electrolyte material comprises Li, T, X and A wherein T is at least one of P, As, Si, Ge, Al, Sb, W, and B; X is one or more halogens and/or N; A is one or more of S or Se. The solid electrolyte material has peaks at 14.9°±0.50°, 20.4°±0.50°, and 25.4°±0.50° in X-ray diffraction measurement with Cu-Ka(1,2)=1.5418 Å and may include glass ceramic and/or mixed crystalline phases.