All-Solid-State Battery Anode Primer Layer for Peel Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing all-solid-state batteries face challenges with poor adhesive strength between the current collector and the negative electrode coating layer, leading to peeling and reduced electrochemical performance.
Innovation Solution
A negative electrode design featuring a primer layer with a linear carbon-based material and a carbon-metal coating layer, optimized thickness and resistance, enhances adhesive strength and electrochemical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional negative electrode structure without a primer layer is used, then the device complexity is reduced, but the adhesive strength between the current collector and the negative electrode coating layer deteriorates
Solution Approach 1:
A primer layer comprising linear carbon-based materials (carbon nanotubes, carbon nanofibers) is introduced as an intermediary between the current collector and the negative electrode coating layer. This primer layer acts as a mediator that enhances adhesive strength by providing both mechanical anchoring through its fibrous network and chemical bonding sites, thereby resolving the adhesion problem without requiring fundamental changes to the existing electrode structure.
Solution Approach 2:
The negative electrode is constructed as a composite structure with three distinct layers: the current collector, the primer layer containing linear carbon-based materials, and the negative electrode coating layer. This composite architecture combines the advantages of each layer - the current collector provides structural support, the primer layer provides adhesion enhancement, and the coating layer provides electrochemical activity - thereby achieving superior overall performance.
2Strength
If the primer layer thickness is increased to improve adhesive strength, then the adhesive strength improves, but the electron transport efficiency deteriorates due to increased resistance
Solution Approach 1:
The thickness of the primer layer is precisely controlled within the range of 0.01 μm to 1 μm, and the sheet resistance is optimized to be between 0.1 mΩ/sq to 10 mΩ/sq. These parameter optimizations ensure that the primer layer is thick enough to provide sufficient adhesion while remaining thin enough to maintain excellent electron transport efficiency, preventing unnecessary electrical resistance.
Solution Approach 2:
The primer layer is designed with localized high conductivity characteristics through the use of linear carbon-based materials that form conductive networks within the layer. This allows different regions of the primer layer to serve different functions - providing both mechanical adhesion and electrical conductivity - thereby resolving the contradiction between thickness and electron transport efficiency.
3Strength
If a primer layer with linear carbon-based material is added to improve adhesive strength, then the adhesive strength and electrochemical performance improve, but the manufacturing cost increases
Solution Approach 1:
The content of linear carbon-based materials in the primer layer is optimized to be 1-90 wt%, with particularly effective ranges of 10-50 wt%. This parameter optimization ensures sufficient adhesion enhancement while controlling material costs. The primer layer can be applied using conventional coating techniques, avoiding the need for expensive specialized manufacturing equipment or processes.
Data Source
AI summary
The present invention relates to a negative electrode for an all-solid-state battery, and an all-solid-state battery including same, the negative electrode for an all-solid-state battery comprising: a current collector, a primer layer, which is positioned on the current collector, includes a linear carbon-based material and has thickness of 1 μm or less, and a negative electrode coating layer, which is positioned on the primer layer and includes amorphous carbon and metal.