Dual-Layer Solid Electrolyte for Dendrite-Resistant Solid-State Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing all solid-state batteries face challenges in enhancing lithium ion conductivity and preventing lithium dendrite growth due to limitations in the design and composition of the solid electrolyte layers.
Innovation Solution
The implementation of a dual-layer solid electrolyte structure, where the first solid electrolyte layer is an irregular, dense layer containing alcohol, and the second solid electrolyte layer is a larger-particle layer, enhances lithium ion conductivity and prevents dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer solid electrolyte structure is used, then the device complexity is low, but the lithium ion conductivity is insufficient and dendrite growth cannot be prevented
Solution Approach 1:
The solid electrolyte layer is divided into two distinct layers: a first solid electrolyte layer in contact with the negative electrode and a second solid electrolyte layer in contact with the positive electrode. This segmentation allows each layer to be optimized for specific functions, with the first layer preventing dendrite growth and the second layer ensuring stable ion transport, thereby resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
Different regions of the solid electrolyte layer are assigned different properties: the first solid electrolyte layer near the negative electrode has properties optimized for dendrite prevention and interfacial contact, while the second solid electrolyte layer near the positive electrode has properties optimized for bulk ion conductivity. This local differentiation enables each region to perform its specific function effectively, improving overall reliability without requiring a completely complex structure.
2Reliability
If the solid electrolyte layer is made dense to prevent dendrite growth, then the reliability improves, but the manufacturing precision requirements increase due to the irregular layer formation
Solution Approach 1:
The first solid electrolyte layer is formed with an irregular, dense structure that preliminarily establishes strong interfacial contact with the negative electrode before the second layer is applied. This preliminary action ensures dendrite prevention is already in place, and the subsequent second layer can be formed with less stringent precision requirements, as it primarily needs to provide stable ion transport rather than critical interfacial contact.
3Reliability
If alcohol is added to the first solid electrolyte layer to improve interfacial contact, then the lithium ion conductivity improves, but the loss of substance increases due to alcohol content
Solution Approach 1:
The alcohol content in the first solid electrolyte layer is precisely controlled within a specific range (0.01 wt% to 5 wt%). This parameter optimization ensures sufficient interfacial contact improvement and lithium ion conductivity enhancement while minimizing substance loss. The controlled alcohol content creates optimal interfacial properties without excessive material consumption, resolving the contradiction between reliability improvement and substance conservation.
Data Source
AI summary
An all solid-state battery includes a negative electrode; a positive electrode; and a solid electrolyte layer between the negative electrode and the positive electrode, wherein the solid electrolyte layer includes a first solid electrolyte layer in contact with the negative electrode, and a second solid electrolyte layer in contact with the positive electrode, the first solid electrolyte layer is an irregular layer and includes an alcohol.