Hydrogen-Halide Solid Electrolyte for Heat-Stable Li-Ion Conductivity

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Solution Overview

Problem

Solid electrolyte materials experience a decrease in ion conductivity due to heat, which affects the performance and stability of batteries, especially during high-temperature manufacturing processes and varying environmental temperatures.

Innovation Solution

A solid electrolyte material comprising Li, M, O, X, and H, where M is Nb or Ta, X is F, Cl, Br, or I, and the molar ratio of H to M is greater than 0.08 and less than 1.50, which suppresses the decrease in ion conductivity and enhances heat resistance, maintaining high lithium ion conductivity even at elevated temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solid electrolyte materials are used, then the battery can operate at room temperature, but the ion conductivity decreases significantly at elevated temperatures

Engineering Contradiction:

Improveion conductivity stabilityVSAvoidheat resistance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the chemical composition parameters of the solid electrolyte by introducing hydrogen atoms at specific molar ratios (0.01 < H/M ≤ 0.10) and using specific halogen elements (F, Cl, Br, I), which fundamentally alters the material's thermal stability and ion conductivity characteristics to maintain performance at elevated temperatures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte material combining lithium (Li), metal M (Nb or Ta), oxygen (O), halogen (X), and hydrogen (H) in a specific compositional framework (Li-M-O-X-H), where the synergistic interaction between these elements produces enhanced heat resistance while maintaining ion conductivity

Inventive Principle:

Principle #40Composite materials

2Reliability

If the solid electrolyte material contains higher hydrogen content to improve ion conductivity, then lithium ion conductivity increases, but the structural stability may be compromised

Engineering Contradiction:

Improveion conductivityVSAvoidstructural stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent precisely controls the hydrogen-to-metal molar ratio within the range 0.01 < H/M ≤ 0.10, optimizing this compositional parameter to achieve the right balance between enhancing ion conductivity through hydrogen incorporation and maintaining structural stability by preventing excessive hydrogen content that could destabilize the crystal lattice

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250015348A1Solid electrolyte material and battery using same

Publication Date: 2025.01.09 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

The solid electrolyte material of the present disclosure comprises Li, M, O, X, and H. Here, M is at least one selected from the group consisting of Nb and Ta, X is at least one selected from the group consisting of F, Cl, Br, and I, and the molar ratio of H to M is greater than 0.08 and 1.50 or less. The battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer provided 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.