Fluorinated Solid Electrolyte Composition for Higher Ionic Conductivity

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Solution Overview

Problem

Conventional solid electrolytes containing fluorine have low ionic conductivity.

Innovation Solution

A solid electrolyte composed of Li, Ti, and M (where M is selected from Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Zr, and Sn) with a specific X-ray diffraction peak intensity ratio of 1.0 to 3.3, enhanced by long-time annealing, to improve ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fluorine is included in the solid electrolyte composition, then oxidation resistance is improved, but ionic conductivity deteriorates

Engineering Contradiction:

Improveoxidation resistanceVSAvoidionic conductivity

Core Design Contradiction:

ReliabilityVSReliability

Solution Approach 1:

The patent changes the crystal structure parameters of the solid electrolyte by controlling the ratio of specific X-ray diffraction peaks (I2/I1 between 1.0-3.3), which corresponds to modifying the atomic arrangement and lattice parameters. This parameter change enables the material to achieve both high oxidation resistance from fluorine inclusion and high ionic conductivity through optimized crystal structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte material containing multiple elements (Li, Ti, M where M is selected from Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Zr, or Sn, and F) with specific compositional ratios. This composite approach allows the material to combine the oxidation resistance of fluorine with the ionic conductivity provided by the specific metal element combinations and crystal structure

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 electrolyte exhibits higher ionic conductivity and improved oxidation resistance, suppressing electrolyte decomposition and enhancing battery performance.

Implementation Method 1

the ionic conductivity of a solid electrolyte including fluorine can be improved

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

In the X-ray diffraction pattern obtained by X-ray diffraction measurement using Cu Kα radiation

Methodology Applied

Scientific EffectX-ray diffraction: X-Ray

Implementation Method 3

a ratio of an intensity of a peak present in a diffraction angle 2θ range from 40° to 43° to an intensity of a peak present in a diffraction angle 2θ range from 19° to 23°

Methodology Applied

Scientific EffectDiffraction: Diffraction

Implementation Method 4

Patent Literature 1 discloses that a solid electrolyte material including fluorine has excellent oxidation resistance

Methodology Applied

Scientific EffectOxidation resistance: Oxidation

Data Source

PatentUS20260094866A1Solid electrolyte, electrode material, lithium-ion battery, and method for producing solid electrolyte

Publication Date: 2026.04.02 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A solid electrolyte 10 according to the present disclosure includes Li, Ti, M, and F. The M is at least one selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Zr, and Sn. In an X-ray diffraction pattern obtained by X-ray diffraction measurement using Cu Kα radiation, a ratio of an intensity of a peak present in a diffraction angle 2θ range from 40° to 43° to an intensity of a peak present in a diffraction angle 2θ range from 19° to 23° is 1.0 or more and 3.3 or less.