Sulfide Solid-State Battery Amorphous Crystalline Interface

Solution Overview

Problem

Solid-state batteries face challenges in maintaining discharge capacity and cycle characteristics due to the formation of pores at the interface between electrode active materials and solid-state electrolytes, which degrades battery performance.

Innovation Solution

Incorporating a sulfide-based solid-state electrolyte with a higher proportion of amorphous material in the cathode and anode, and a higher proportion of crystalline material in the solid-state electrolyte layer, to prevent pore formation and maintain high lithium-ion conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a solid-state electrolyte with high crystalline material proportion is used in the solid-state electrolyte layer, then lithium-ion conductivity is improved, but pore formation at the interface with electrode active materials occurs, degrading battery performance

Engineering Contradiction:

Improvelithium-ion conductivityVSAvoidpore formation at interface

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by using different proportions of amorphous and crystalline materials in different regions: the solid-state electrolyte layer contains a higher proportion of crystalline material (second proportion) for high lithium-ion conductivity, while the electrode mixture contains a higher proportion of amorphous material (first proportion) to prevent pore formation at the electrode-electrolyte interface. This spatial differentiation of material composition resolves the contradiction between conductivity and interface stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining amorphous and crystalline solid-state electrolyte materials in specific proportions. The electrode mixture contains more amorphous material to provide interface stability and prevent pore formation, while the solid-state electrolyte layer contains more crystalline material to ensure high lithium-ion conductivity. This composite approach allows both requirements to be satisfied simultaneously in different regions of the battery.

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If a solid-state electrolyte with high amorphous material proportion is used in the electrode, then pore formation is prevented, but lithium-ion conductivity decreases

Engineering Contradiction:

Improveinterface stabilityVSAvoidlithium-ion conductivity

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent applies local quality by using different proportions of amorphous and crystalline materials in different regions: the solid-state electrolyte layer contains a higher proportion of crystalline material (second proportion) for high lithium-ion conductivity, while the electrode mixture contains a higher proportion of amorphous material (first proportion) to prevent pore formation at the electrode-electrolyte interface. This spatial differentiation of material composition resolves the contradiction between conductivity and interface stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining amorphous and crystalline solid-state electrolyte materials in specific proportions. The electrode mixture contains more amorphous material to provide interface stability and prevent pore formation, while the solid-state electrolyte layer contains more crystalline material to ensure high lithium-ion conductivity. This composite approach allows both requirements to be satisfied simultaneously in different regions of the battery.

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

This configuration enhances discharge capacity and cycle characteristics by preventing interface degradation and maintaining high lithium-ion conductivity, thus improving battery performance.

Implementation Method 1

A sulfide solid-state electrolyte includes an amorphous material and a crystalline material... maintaining high lithium-ion conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS9166253B2Solid-state battery

Publication Date: 2015.10.20 SAMSUNG ELECTRONICS CO LTD

AI summary

A solid-state battery including: a cathode, an anode, a solid-state electrolyte layer disposed between the cathode and the anode, wherein the solid-state electrolyte layer and at least the cathode of the cathode and the anode includes a sulfide solid-state electrolyte, the sulfide solid-state electrolyte includes an amorphous material and a crystalline material, a first proportion of the amorphous material in at least the cathode of the cathode and the anode is greater than a first proportion of the crystalline material in at least the cathode of the cathode and the anode, and a second proportion of the amorphous material in the solid-state electrolyte layer is less than a second proportion of the crystalline material in the solid-state electrolyte layer.