Pyrochlore Solid Electrolyte Composition for Higher Battery Ionic Conductivity

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Solution Overview

Problem

Conventional oxide solid electrolytes with garnet or NASICON structures have low ionic conductivities, making it difficult to achieve sufficient output density in secondary batteries.

Innovation Solution

A solid electrolyte with a pyrochlore structure, represented by the composition formula Aa2−αAb(1+α)/3B2O7−βXβ, where Aa is an alkali metal, Ab contains a lanthanide, and X is an anion substitutable with O, enhancing ionic conductivity through a defect structure and specific cation and anion composition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional oxide solid electrolytes with garnet or NASICON structures are used, then the battery structure is simple and easy to manufacture, but the ionic conductivity is low resulting in insufficient output density

Engineering Contradiction:

Improveease of manufactureVSAvoidionic conductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the crystal structure parameter from garnet or NASICON to pyrochlore structure, and modifies the composition parameters by substituting cations (Aa, Ab, B) and anions (X) to achieve higher ionic conductivity while maintaining manufacturability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte material combining multiple elements (alkali metal Aa, lanthanide Ab, cationic metal B, and anion X) in a pyrochlore structure to achieve superior ionic conductivity compared to conventional single-structure electrolytes

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional oxide solid electrolytes are used, then the manufacturing process is simple, but the output density is insufficient due to low ionic conductivity

Engineering Contradiction:

Improveoutput densityVSAvoidionic conductivity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes composition parameters (ratios of Aa, Ab, B, and X) and crystal structure (pyrochlore) to maximize ionic conductivity, thereby achieving sufficient output density for practical battery applications

Inventive Principle:

Principle #35Parameter changes

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 pyrochlore structured solid electrolyte significantly improves ionic conductivity, enabling higher output density in secondary batteries, particularly lithium ion batteries, by optimizing the composition ratios of Aa, Ab, and X, and controlling defect concentrations.

Implementation Method 1

A solid electrolyte for a secondary battery includes an oxide-based solid electrolyte having a pyrochlore structure and represented by a composition formula Aa2−αAb(1+α)/3B2O7−βXβ

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20240380001A1Solid electrolyte for secondary battery, and secondary battery

Publication Date: 2024.11.14 DENSO CORP

AI summary

A solid electrolyte for a secondary battery includes an oxide-based solid electrolyte having a pyrochlore structure represented by a composition formula of Aa2−αAb(1+α)/3B2O7−βXβ, where Aa is an alkali metal, Ab contains at least a lanthanide, B is a cationic metal different from Aa and Ab, and X is an anion that is substitutable with an O atom constituting the pyrochlore structure.