Fluoride Solid Electrolyte Composition for Higher Li-Ion Conductivity

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Solution Overview

Problem

Fluoride solid electrolyte materials generally exhibit low lithium ion conductivity and high oxidation resistance, limiting their effectiveness in battery applications.

Innovation Solution

A solid electrolyte material composed of Li, Sn, and M1 (where M1 is Al, Y, Zr, or Mg) with specific compositional ratios and crystalline phases to enhance lithium ion conductivity and oxidation resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional fluoride solid electrolyte materials are used, then material stability is improved, but battery performance deteriorates due to low ionic conductivity

Engineering Contradiction:
Improvematerial stabilityVSAvoidbattery performance
Core Design Contradiction:
Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent uses composite materials comprising Li, Sn, and M1 (Al, Y, Zr, Ti, or Mg) in specific ratios to create a fluoride solid electrolyte that maintains compositional stability while achieving high ionic conductivity. This composite structure preserves the inherent stability of fluoride materials while introducing elements that enhance lithium ion transport, thereby improving battery performance without sacrificing material stability.

Inventive Principle:
Principle #40Composite materials

Solution Approach 2:

The patent optimizes battery performance by changing the compositional parameters of the fluoride solid electrolyte. By adjusting the ratios of Li, Sn, and M1 elements, the patent achieves both material stability and high ionic conductivity (8×10−9 S/cm or more at room temperature), which directly improves battery productivity and performance.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS20260088346A1Solid electrolyte material and battery using the same
Publication Date: 2026.03.26 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
  • US20260088346A1 patent drawing
  • US20260088346A1 patent drawing
  • US20260088346A1 patent drawing

AI summary

A solid electrolyte material contains Li, Sn, M1, and F, where M1 is at least one selected from the group consisting of Al, Y, Zr, Ti, and Mg. A battery includes: a positive electrode; a negative electrode; and a separator layer 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 separator layer contains the solid electrolyte material.