Halide Solid Electrolyte for Sulfur-Free Batteries

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Solution Overview

Problem

Current solid electrolyte materials for all-solid-state batteries face challenges in achieving high lithium ion conductivity and safety, particularly due to the production of hydrogen sulfide and limitations in charge and discharge characteristics.

Innovation Solution

A solid electrolyte material composed of Li, M, and X, where M contains Y and X is Cl, Br, or I, with specific X-ray diffraction pattern characteristics, enhancing lithium ion conductivity and allowing for the production of sulfur-free all-solid-state batteries with improved charge and discharge characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfur-based solid electrolyte materials are used, then lithium ion conductivity can be achieved, but hydrogen sulfide is produced causing safety issues

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidhydrogen sulfide production

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by replacing sulfur-based electrolytes with halide-based electrolytes (Li3YCl6, Li3YBr6, or their solid solutions), fundamentally altering the material system to eliminate hydrogen sulfide production while maintaining lithium ion conductivity through the halide ion conduction mechanism

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material strategies by creating solid solution systems between Li3YCl6 and Li3YBr6, allowing optimization of both ionic conductivity and structural stability through controlled composition ratios, thereby achieving high performance without the harmful effects of sulfur-based materials

Inventive Principle:

Principle #40Composite materials

2Duration of action of moving object

If conventional solid electrolyte materials are used, then battery operation is possible, but charge and discharge characteristics are limited

Engineering Contradiction:

Improvecharge and discharge characteristicsVSAvoidperformance limitation

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent optimizes charge and discharge characteristics by adjusting compositional parameters (mixing ratios of Li3YCl6 and Li3YBr6) and structural parameters (crystal phase composition), achieving enhanced ionic conductivity and electrochemical performance that enables superior charge-discharge behavior compared to conventional materials

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adaptability in the electrolyte system by creating tunable solid solution compositions that can be optimized for specific application requirements, allowing the material to exhibit optimal performance characteristics under different operating conditions through compositional adjustment

Inventive Principle:

Principle #15Dynamics

3Reliability

If high performance solid electrolyte is used, then lithium ion conductivity improves, but production temperature requirements increase

Engineering Contradiction:

Improvelithium ion conductivityVSAvoidproduction temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent reduces production temperature requirements by optimizing the synthesis parameters including heating temperature (maintained below 500°C), heating time (1 hour or less), and atmospheric conditions (sulfur-free atmosphere), enabling energy-efficient production of high-performance halide-based solid electrolytes with superior ionic conductivity

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 material achieves high lithium ion conductivity and superior charge and discharge characteristics while being sulfur-free, ensuring safety and enabling production at medium or low temperatures with short heating periods.

Implementation Method 1

This configuration helps realize a solid electrolyte material that is highly conductive to lithium ions

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

A first converted pattern, which is obtained by converting the X-ray diffraction pattern of the solid electrolyte material to change its horizontal axis from the diffraction angle 2θ to q

Methodology Applied

Scientific EffectX-ray diffraction: Bragg Diffraction

Data Source

PatentUS11591236B2Solid electrolyte material and battery

Publication Date: 2023.02.28 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A solid electrolyte material contains Li, M, and X. M contains Y, and X is at least one selected from the group consisting of Cl, Br, and I. A first converted pattern, which is obtained by converting the X-ray diffraction pattern of the solid electrolyte material to change its horizontal axis from the diffraction angle to q, includes its base peak within the range in which q is 2.109 Å−1 or more and 2.315 Å−1 or less. A second converted pattern, which is obtained by converting the X-ray diffraction pattern to change its horizontal axis from the diffraction angle to q/q0, where q0 is the q corresponding to the base peak in the first converted pattern, includes a peak within each of the range in which q/q0 is 1.28 or more and 1.30 or less and the range in which q/q0 is 1.51 or more and 1.54 or less.