Li-M-X-H-O Solid Electrolyte Composition for Room-Temperature Ion Transport

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Solution Overview

Problem

Current solid electrolyte materials for batteries lack sufficient ion conductivity, which hampers the development of high-performance, all-solid-state secondary batteries with excellent charge and discharge characteristics.

Innovation Solution

A new solid electrolyte material comprising Li, M, X, H, and O, where M is at least one element from Al, Ga, or In, and X is a halogen such as F, Cl, Br, or I, is developed, enhancing ion conductivity through a composition represented by Formula (1): Li1-aMaX1+2a(H2O)b, with specific molar proportions and manufacturing methods like mechanochemical milling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solid electrolyte materials (such as Li3AlF6) are used, then the battery structure can be simplified with solid electrolytes, but the ion conductivity is insufficient to achieve high-performance charge and discharge characteristics

Engineering Contradiction:

Improveion conductivityVSAvoidcharge and discharge characteristics

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the chemical composition parameters by introducing halogen elements (F, Cl, Br, I) into the solid electrolyte material formula Li1-aMaX1+2a(H2O)b, where X represents halogen. This parameter change enables achieving ion conductivity of 2.5×10^-5 S/cm or higher at room temperature, resolving the contradiction between maintaining solid electrolyte structure and achieving sufficient ion conductivity for high-performance batteries

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite solid electrolyte materials by combining lithium (Li), metal elements (M: Al, Ga, In, V), halogen elements (X: F, Cl, Br, I), hydrogen (H), and oxygen (O) in specific ratios. This composite approach achieves both the structural benefits of solid electrolytes and the high ion conductivity needed for excellent charge and discharge characteristics

Inventive Principle:

Principle #40Composite materials

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 ion conductivity greater than or equal to 2.5×10−5 S/cm at room temperature, enabling batteries with improved charge and discharge characteristics and energy density.

Implementation Method 1

the solid electrolyte material according to the first embodiment has, for example, a high ion conductivity. Accordingly, the solid electrolyte material according to the first embodiment can be used for obtaining a battery having excellent charge and discharge characteristics

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20240063432A1Solid electrolyte material and battery using the same

Publication Date: 2024.02.22 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material of the present disclosure comprises Li, M, X, H, and O. M is at least one element selected from the group consisting of Al, Ga, In, and V. X is at least one element selected from the group consisting of F, Cl, Br, and I. The battery of the present disclosure comprises a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material of the present disclosure.