Halide Solid Electrolyte Crystallite Size for Battery Output

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Solution Overview

Problem

Existing halogen-containing solid electrolyte materials for batteries do not adequately enhance battery output properties, necessitating improvements in ion conductivity and crystallite size to optimize performance.

Innovation Solution

A solid electrolyte material with a halide composition containing Li, metalloids, and halogens like F, Cl, and I, with a crystallite size greater than or equal to 40 nm, which improves ion conductivity and reduces interfacial resistance, thereby enhancing battery output properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If halogen-containing solid electrolyte materials are used in batteries, then ion conductivity is improved, but output properties are insufficient

Engineering Contradiction:

Improveion conductivityVSAvoidoutput properties

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the physical parameter of crystallite size from its conventional small dimensions to a specific range of 40-200 nm. This parameter change optimizes the balance between ion conductivity (improved by sufficient crystallinity) and output properties (enhanced by adequate grain boundary area), resolving the contradiction between reliability and productivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite halide solid electrolyte materials containing multiple halogen elements (F, Cl, Br, I) combined with metal elements (Li, Na, K, etc.). This composite approach leverages the advantageous properties of different halogen-containing compounds to simultaneously achieve high ion conductivity and excellent output properties, overcoming the limitations of single-component materials

Inventive Principle:

Principle #40Composite materials

2Productivity

If crystallite size of halide solid electrolyte is increased to improve output properties, then ion conductivity may be reduced

Engineering Contradiction:

Improveoutput propertiesVSAvoidion conductivity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent identifies and optimizes the crystallite size parameter within the specific range of 40-200 nm. This optimized range provides sufficient crystallinity for maintaining high ion conductivity while ensuring adequate grain boundary area for enhancing output properties, thus resolving the contradiction between reliability and productivity

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 proposed solid electrolyte material significantly improves battery output properties by increasing ion conductivity and reducing interfacial resistance, leading to better performance and safety by preventing hydrogen sulfide gas generation.

Implementation Method 1

the halide solid electrolyte has a crystallite size greater than or equal to 40 nm... the output properties of batteries that use halogen-containing solid electrolyte materials can be improved

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS20240055654A1Solid electrolyte material and battery

Publication Date: 2024.02.15 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material contains a halide solid electrolyte. The halide solid electrolyte contains Li, at least one element selected from the group consisting of metalloids and metal elements other than Li, and at least one element selected from the group consisting of F, Cl, Br, and I. The halide solid electrolyte has a crystallite size greater than or equal to 40 nm.