Halide Solid Electrolyte Composition for Safe High-Conductivity Batteries

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Solution Overview

Problem

Existing all-solid-state batteries face challenges with sulfide solid electrolytes, as they generate hydrogen sulfide when exposed to the atmosphere, and have limited lithium ion conductivity, affecting their safety and performance.

Innovation Solution

A halide solid electrolyte material represented by the chemical formula Li6−(4+a)b(Zr1−aMa)bX6, where M is Ta or Nb, and X is a halogen, with specific mole fraction ranges, is developed to enhance lithium ion conductivity and safety by avoiding sulfur and hydrogen sulfide generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide solid electrolyte is used in all-solid-state batteries, then the battery can be constructed with solid electrolyte components, but hydrogen sulfide is generated when exposed to the atmosphere, compromising safety

Engineering Contradiction:

Improvebattery safetyVSAvoidhydrogen sulfide generation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the solid electrolyte by substituting sulfur-based compounds with halide-based compounds (chloride, bromide, or iodide). Specifically, the electrolyte uses Li-Zr-M-X6 composition where X is a halogen element, fundamentally altering the chemical nature to eliminate hydrogen sulfide generation while maintaining solid electrolyte functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful sulfur-containing chemistry into beneficial halide chemistry. By replacing sulfide-based solid electrolytes with halide-based solid electrolytes, the harmful hydrogen sulfide generation is eliminated while the electrochemical performance is actually improved through enhanced lithium ion conductivity and broader electrochemical stability window

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Productivity

If sulfide solid electrolyte is used in all-solid-state batteries, then the battery structure can be implemented, but lithium ion conductivity is limited, affecting performance

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidbattery performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes the compositional parameters of the solid electrolyte by controlling the substitution ratios of elements M (Ta or Nb) and the halogen element X. The specific composition range Li6-(4+a)b(Zr1-aMa)bX6 with defined parameter ranges (0<a≤1, 0<b≤1.5, a+b≤1) is designed to maximize lithium ion conductivity while maintaining structural stability, achieving superior electrochemical performance compared to conventional sulfide electrolytes

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 halide solid electrolyte material achieves high lithium ion conductivity and safe operation, enabling good charge-discharge characteristics in all-solid-state batteries without generating hydrogen sulfide, even when exposed to the atmosphere.

Implementation Method 1

a lithium-ion-conductive solid electrolyte material

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS11855255B2Halide solid electrolyte material and battery including the same

Publication Date: 2023.12.26 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A halide solid electrolyte material according to the present disclosure is represented by the chemical formula Li6−(4+a)b(Zr1−aMa)bX6, wherein M denotes at least one element selected from the group consisting of Ta and Nb, X denotes at least one halogen element, and two mathematical formulae 0<a<1 and 0<b<1.5 are satisfied.