Solid Electrolyte Ion Conductivity via Crystal Structure

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Solution Overview

Problem

Conventional solid electrolytes disclosed in the prior art lack sufficient ion conductivity, resulting in inadequate discharge capacity in solid electrolyte batteries.

Innovation Solution

A solid electrolyte containing an alkali metal element, a tetravalent metal element, and a halogen element, with specific X-ray diffraction peak positions and intensity ratios, which enhances ion conductivity by forming an ion conduction path within the crystal structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solid electrolytes (oxide-based, sulfide-based, complex hydride-based) are used in solid electrolyte batteries, then the battery structure can be formed through sintering or powder forming methods, but the ion conductivity is insufficient resulting in inadequate discharge capacity

Engineering Contradiction:

Improveion conductivityVSAvoiddischarge capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention changes the chemical composition parameters of the solid electrolyte by introducing a specific compound containing alkali metal element, tetravalent metal element, and halogen element with controlled stoichiometric ratios. This compositional parameter change results in improved ion conductivity while maintaining structural stability, directly resolving the contradiction between reliability and productivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite solid electrolyte material combining multiple elements (alkali metal, tetravalent metal, and halogen) in a specific compound structure. This composite approach leverages the beneficial properties of each element to achieve high ion conductivity and sufficient discharge capacity simultaneously, overcoming the limitations of conventional single-type solid electrolytes

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 proposed solid electrolyte exhibits high ion conductivity, leading to improved discharge capacity and performance in solid electrolyte batteries.

Implementation Method 1

a solid electrolyte which contains, as a main element, a compound containing an alkali metal element, a tetravalent metal element, and a halogen element and in which a characteristic structure is confirmed in measurement results of X-ray diffraction (XRD)... the ion conductivity of movable ions is high

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

in which a characteristic structure is confirmed in measurement results of X-ray diffraction (XRD)... the compound has diffraction peaks at positions of 2θ=32.0°±0.5° and 2θ=34.4°±0.5° for a wavelength of CuKα rays

Methodology Applied

Scientific EffectX-ray diffraction: X-Ray

Implementation Method 3

the compound has diffraction peaks at positions of 2θ=32.0°±0.5° and 2θ=34.4°±0.5° for a wavelength of CuKα rays

Methodology Applied

Scientific EffectDiffraction: Diffraction

Data Source

PatentUS20220294007A1Solid electrolyte, solid electrolyte layer, and solid electrolyte battery

Publication Date: 2022.09.15 TDK CORP

AI summary

A solid electrolyte contains a compound that contains an alkali metal element, a tetravalent metal element, and a halogen element as main elements, in which the compound has diffraction peaks at positions of 2θ=32.0°±0.5° and 2θ=34.4°±0.5° for a wavelength of CuKα rays, and a ratio IB/IA of a diffraction intensity IB of a peak with a strongest diffraction intensity at 2θ=34.4°±0.5° to a diffraction intensity IA of a peak with a strongest diffraction intensity at 2θ=32.0°±0.5° satisfies 0<IB/IA≤3.