Solid Electrolyte Ionic Conductivity via Composite Composition

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Solution Overview

Problem

Conventional solid electrolyte batteries have insufficient ionic conductivity, leading to inadequate discharge capacity.

Innovation Solution

A solid electrolyte composed of an alkali metal, a metal element or metalloid with a valence of 1 to 6, an element from Group XVII, and an element from Group XVI, represented by the formula A2+aE1−b+αGbDeXd, where A is Li, K, or Na, E is Zr, Hf, Ti, or Sn, G is various elements, and X is F, Cl, or Br, with specific valence-dependent coefficients, enhancing ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solid electrolytes are used in solid electrolyte batteries, then the battery structure can be established, but the ionic conductivity is insufficient leading to inadequate discharge capacity

Engineering Contradiction:

Improveionic conductivityVSAvoiddischarge capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of Li2ZrO3 (40-60 mol%), ZrO2 (10-30 mol%), and Li3PO4 (10-30 mol%). This compositional parameter optimization achieves high ionic conductivity (1.0×10^-3 to 1.0×10^-2 S/cm) while maintaining structural stability, thereby resolving the contradiction between reliability and productivity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte material by combining multiple compounds (Li2ZrO3, ZrO2, Li3PO4) into a single-phase composite. This composite structure leverages the complementary properties of each component: Li2ZrO3 provides ionic conductivity pathways, ZrO2 enhances structural stability, and Li3PO4 contributes to phase stability. The synergistic effect achieves both high ionic conductivity and sufficient discharge capacity

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 achieves high ionic conductivity, resulting in solid electrolyte batteries with low internal resistance and large discharge capacity.

Implementation Method 1

a solid electrolyte having a high ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20220246983A1Solid electrolyte, solid electrolyte layer, and solid electrolyte cell

Publication Date: 2022.08.04 TDK CORP

AI summary

A solid electrolyte includes a compound composed of an alkali metal, at least one of a metal element and a metalloid element having a valence of 1 to 6, an element belonging to Group XVII of the periodic table and an element belonging to Group XVI of the periodic table.