Stacked Solid-State Battery Layout for Dendrite And Overcharge Protection

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Solution Overview

Problem

Existing all-solid-state batteries face challenges such as dendrite growth, damage from overcharging, and poor electrical properties due to poor interface contact between the electrolyte and electrodes, interfacial side reactions, and concentration of electric fields.

Innovation Solution

The all-solid-state battery design includes an electrode assembly with a solid electrolyte layer, where the first and second battery units are stacked with the solid electrolyte interposed between them, and external electrodes are connected to the electrodes. This configuration suppresses dendrite growth and acts as a protection unit against overcharging, while improving electrical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a ceramic-based solid electrolyte is used to improve stability, then stability is improved, but ion conductivity is lowered due to poor interface contact between electrolyte and electrode

Engineering Contradiction:

ImprovestabilityVSAvoidion conductivity

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

A buffer layer is introduced as an intermediary between the ceramic-based solid electrolyte and the electrode. This buffer layer improves interface contact and reduces interfacial resistance, thereby enhancing ion conductivity while maintaining the stability benefits of the ceramic electrolyte.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The battery structure employs a composite design combining ceramic-based solid electrolyte with a buffer layer material. This composite approach leverages the stability of ceramics while the buffer layer component addresses the interface contact issue, achieving both stability and high ion conductivity.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If high voltage lithium secondary batteries are implemented to increase energy density, then energy density is improved, but the risk of electrolyte leakage, fires, and explosions increases

Engineering Contradiction:

Improveenergy densityVSAvoidrisk of electrolyte leakage, fires, and explosions

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional liquid electrolyte (which poses safety risks) with a solid electrolyte that is inherently safer and more stable. This substitution eliminates the harmful effects of liquid electrolyte leakage, fires, and explosions while maintaining high energy density through optimized electrode and electrolyte design.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Quantity of substance

If the electrode assembly is designed with multiple battery units stacked in the third direction to increase capacity, then capacity is improved, but dendrite growth occurs due to ion concentration at the end portion

Engineering Contradiction:

ImprovecapacityVSAvoiddendrite growth

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies different structural characteristics to different regions of the electrode assembly. The buffer layer is strategically positioned at the end portions where ion concentration occurs, providing localized improvement to prevent dendrite growth while maintaining the overall high capacity structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The buffer layer acts as a protective cushion placed beforehand at the end portions of the electrode assembly where ion concentration and dendrite formation are most likely to occur. This preventive measure addresses the dendrite issue before it can develop, allowing the multi-unit stacked structure to achieve high capacity safely.

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 battery effectively suppresses dendrite growth and prevents damage from overcharging, while enhancing electrical properties, thus ensuring stable and efficient operation.

Implementation Method 1

a solid electrolyte layer, a first battery unit having a first negative electrode and a first positive electrode, and a second battery unit having a second negative electrode and a second positive electrode, the first negative and positive electrodes and the second negative and positive electrodes being respectively stacked in the third direction with the solid electrolyte layer interposed therebetween

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS12230754B2All-solid-state battery

Publication Date: 2025.02.18 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

An all-solid-state battery includes an electrode assembly including a solid electrolyte layer, a first battery unit having a first negative electrode and a first positive electrode, and a second battery unit having a second negative electrode and a second positive electrode, in which the first negative and positive electrodes and the second negative and positive electrodes are respectively stacked with the solid electrolyte layer interposed therebetween. The all-solid-state battery further includes a first external electrode; a second external electrode; a third external electrode; and a fourth external electrode, in which the second battery unit is disposed to be adjacent to at least one the fifth surface or the sixth surface of the electrode assembly, and the first battery unit is located further inside than the second battery unit in the third direction.