All-Solid Battery Anode Ionic Compound for Cycle Stability

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Solution Overview

Problem

All-solid secondary batteries face poor cycle characteristics due to side reactions between the anode and solid electrolyte layers, which affect their stability and performance during charge and discharge processes.

Innovation Solution

Incorporating an ionic compound, such as a binary or ternary compound without sulfur atoms, into the anode active material layer to suppress side reactions and enhance electrochemical stability, thereby improving the solid electrolyte interface and overall battery performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a solid electrolyte layer is used in an all-solid secondary battery, then safety is improved compared to liquid electrolyte batteries, but side reactions occur between the anode and solid electrolyte layer leading to poor cycle characteristics

Engineering Contradiction:

ImprovesafetyVSAvoidcycle characteristics

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

An ionic compound layer is introduced as an intermediary between the anode active material layer and the solid electrolyte layer. This intermediate layer prevents direct contact and side reactions between the anode and solid electrolyte, thereby improving cycle characteristics while maintaining the safety benefits of solid electrolyte batteries.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The anode structure is designed as a composite system consisting of the anode current collector, anode active material layer, and ionic compound layer. This composite structure combines the electrochemical activity of the anode active material with the protective and ion-conducting properties of the ionic compound layer, resolving the contradiction between reactivity and stability.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If the anode active material layer directly contacts the solid electrolyte layer, then manufacturing is simplified, but side reactions occur reducing battery stability and performance

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidelectrochemical stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The ionic compound layer serves as a thin intermediary barrier that can be deposited using standard coating techniques. While it adds a layer to the structure, it simplifies the overall manufacturing by enabling the use of solid electrolytes without complex protective coating processes, and simultaneously provides the necessary electrochemical stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If lithium dendrites grow in the solid electrolyte layer, then battery capacity increases, but short circuits occur reducing safety and reliability

Engineering Contradiction:

Improvelithium capacityVSAvoidsafety

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The ionic compound layer acts as a physical and chemical barrier that prevents lithium dendrites from penetrating through the solid electrolyte layer. This intermediary layer allows lithium ion transport during normal operation while blocking dendrite growth, thereby maintaining both capacity and safety.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The ionic compound layer is deposited beforehand to create a protective interface that cushions against dendrite formation and growth. This pre-established barrier prevents the harmful effects of dendrites before they can cause short circuits, while still allowing necessary ion transport.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 inclusion of the ionic compound in the anode active material layer stabilizes the solid electrolyte interface, leading to improved cycle characteristics, reduced risk of short circuits, and enhanced safety by preventing the growth of lithium dendrites, thus increasing the battery's efficiency and reliability.

Implementation Method 1

side reactions of a solid electrolyte between an anode layer and a solid electrolyte layer

Methodology Applied

Scientific EffectSide reactions suppression:

Implementation Method 2

preventing the growth of lithium dendrites

Methodology Applied

Scientific EffectDendrite growth prevention:

Data Source

PatentUS12074280B2All-solid secondary battery and method of manufacturing all-solid secondary battery

Publication Date: 2024.08.27 SAMSUNG ELECTRONICS CO LTD

AI summary

An all-solid secondary battery and a method of manufacturing the all-solid secondary battery. The all-solid secondary battery includes: an anode including an anode current collector and a first anode active material layer; a cathode including a cathode active material layer; and a solid electrolyte layer between the anode and the cathode, wherein the first anode active material layer includes an anode active material and an ionic compound, the ionic compound includes a binary compound, a ternary compound, or a combination thereof, and the ionic compound does not include a plurality of sulfur (S) atoms.