Halide Solid Electrolyte for Safe High-Conductivity Batteries

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing solid electrolyte materials for batteries, such as those using sulfide solid electrolytes, face challenges in achieving high lithium ion conductivity and safety due to the generation of hydrogen sulfide when exposed to the atmosphere, which compromises battery safety and performance.

Innovation Solution

A solid electrolyte material with the compositional formula Li3-3δ-2aY1+δ-aMaCl6-x-yBrxIy, where M is Ta or Nb, is developed, offering high lithium ion conductivity and eliminating the risk of hydrogen sulfide generation, thus enhancing battery safety and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide solid electrolyte is used, then lithium ion conductivity is improved, but hydrogen sulfide is generated when exposed to atmosphere compromising safety

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidhydrogen 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 with halide elements (Cl, Br, I) in the Li3YCl6-based compound. This compositional parameter change eliminates the hydrogen sulfide generation issue while maintaining high lithium ion conductivity through optimized doping with Ta or Nb elements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte material combining Li3YCl6 base compound with dopants (Ta or Nb) and halide elements. This composite approach achieves both high ionic conductivity through the composite structure and safety by eliminating harmful sulfide components.

Inventive Principle:

Principle #40Composite materials

2Reliability

If solid electrolyte material composition is optimized for high conductivity, then battery performance is improved, but material stability may be compromised

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidmaterial stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by introducing dopant elements (Ta or Nb) at specific atomic sites within the Li3YCl6 crystal structure. This localized substitution optimizes ionic conductivity pathways while the overall crystal structure maintains its stability. The controlled doping concentration (0.01 ≤ a ≤ 0.5) ensures local optimization without compromising global structural stability.

Inventive Principle:

Principle #3Local quality

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 higher lithium ion conductivity and improved charge and discharge characteristics, ensuring safe and efficient battery operation without generating hydrogen sulfide, thereby securing better energy density and output.

Implementation Method 1

a solid electrolyte material having high lithium ion conductivity can be realized

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS11522216B2Solid electrolyte material and battery

Publication Date: 2022.12.06 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A solid electrolyte material is represented by the following compositional formula (1):Li3-3δ-2aY1+δ-aMaCl6-x-yBrxIy where, M is at least one selected from the group consisting of Ta and Nb; and −1<δ<1, 0<a<1.2, 0<(3−3δ−2a), 0<(1+δ−a), 0≤x≤6, 0≤y≤6, and (x+y)≤6 are satisfied.