Stuffed Sulfide Solid-State Electrolyte for Dendrite Suppression

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Solution Overview

Problem

Sulfide-based ionic-conductive argyrodite structures face challenges such as metal dendrite growth leading to battery shorting and restricted electrochemical window, limiting energy density in solid-state batteries.

Innovation Solution

Incorporating excess sulfur or lithium sulfide into the sulfide-based ionic-conductive argyrodite structure, either within vacancies, interstitials, or as superlattice stacking faults, to form a stuffed structure that enhances dendrite suppression and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sulfide-based ionic-conductive argyrodite structures are used as solid-state electrolyte material, then lithium ion conductivity is improved, but metal dendrite growth can penetrate through the structure leading to battery shorting

Engineering Contradiction:

Improvedendrite suppressionVSAvoidmetal dendrite penetration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating a composite structure where an argyrodite phase coexists with a secondary lithium sulfide phase. This secondary phase is locally distributed within the argyrodite matrix, providing enhanced dendrite suppression at specific interfaces and regions where dendrites are most likely to form, while maintaining the overall argyrodite structure's ionic conductivity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite material system consisting of an argyrodite phase (Li6-a-bPS5-a-b-cXc) combined with a secondary lithium sulfide phase. This composite structure leverages the high ionic conductivity of argyrodite while incorporating lithium sulfide's superior dendrite resistance properties, achieving both improved reliability and harmful factor suppression.

Inventive Principle:

Principle #40Composite materials

2Reliability

If sulfide-based ionic-conductive argyrodite structures are used, then ionic conductivity is enhanced, but the electrochemical window is restricted, limiting energy density

Engineering Contradiction:

Improveionic conductivityVSAvoidelectrochemical window

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by systematically optimizing the chemical composition of the argyrodite phase through controlled substitution of elements at specific lattice sites. By adjusting the values of parameters a, b, and c in the formula Li6-a-bPS5-a-b-cXc, the patent tunes both the ionic conductivity and electrochemical stability, achieving a balance that expands the electrochemical window while maintaining high lithium ion conductivity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4328178B1Solid-state electrolyte material comprising a chalcogenide-based ionic-conductive structure, particularly a sulfide-based ionic-conductive structure

Publication Date: 2026.01.14 AMPCERA INC

Figure 1A~1B
Figure 2
Figure 3A~3B

AI summary

A solid-state electrolyte material, comprising: a chalcogenide-based ionic-conductive structure comprising: one or more of lithium, sodium, aluminum, magnesium, iron, and potassium; one or more of sulfur, oxygen, selenium, and tellurium; one or more of boron, gallium, antimony, silicon, germanium, tin, phosphorus, and arsenic; and at least one of excess chalcogen and excess chalcogenide incorporated into the chalcogenide-based ionic-conductive structure.