Solid Electrolyte Ionic Conductivity via Halogen Doping

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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, specific metal elements, and elements from Group XVII of the periodic table, represented by the formula A2+aE1−b+αGbXd, where A is Li, K, or Na, E is Zr, Hf, Ti, or Sn, and G is various metal elements, with optimized valence and ionic radius ratios to enhance ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional solid electrolytes are used in solid electrolyte batteries, then the battery structure is 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 metal elements (Zr, Hf, Ti, Sn) and halogen elements (F, Cl, Br, I) in controlled ratios defined by the formula A2+aE1−b+αGbXd. This compositional parameter optimization directly enhances ionic conductivity while maintaining structural integrity, resolving the contradiction between reliability and productivity

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite solid electrolyte material combining alkali metals (Li, K, Na) with specific metal elements (Zr, Hf, Ti, Sn) and halogen elements in a defined composite structure. This composite approach leverages the synergistic effects of different elements to achieve high ionic conductivity and sufficient discharge capacity simultaneously

Inventive Principle:
Principle #40Composite materials

Data Source

PatentUS20220255125A1Solid electrolyte, solid electrolyte layer and solid electrolyte battery
Publication Date: 2022.08.11 TDK CORP
  • US20220255125A1 patent drawing

AI summary

A solid electrolyte includes a compound composed of an alkali metal, at least one metal element selected from Zr, Hf, Ti, Sn, Mg, Ca, Sr, Cs, Ba, Y, Al, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Cu, Ag, Au, Pb, Bi, In, Sn, Sb, Nb, Ta and W and an element belonging to Group XVII of the periodic table.