Silane-Coated Solid Electrolyte for Lithium Battery Interfacial Resistance
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Solution Overview
Problem
Lithium batteries face reduced lithium ion conductivity and high initial resistance due to interfacial side reactions between solid electrolytes and lithium metal electrodes, which limits their performance and stability, especially in applications like electric vehicles.
Innovation Solution
A composite solid electrolyte with a lithium ion conductor and a coating layer containing a silane compound, which reduces interfacial resistance and enhances resistance to reduction reactions, is developed. The coating layer is formed by mixing a silane compound with the lithium ion conductor and a solvent, followed by drying, to create a protective film that suppresses side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used in a lithium battery, then safety is improved, but interfacial side reactions with lithium metal electrodes occur causing reduced lithium ion conductivity and high initial resistance
Solution Approach 1:
A coating layer comprising a silane compound is introduced as an intermediary between the solid electrolyte and the lithium metal electrode. This coating layer acts as a mediator that prevents direct contact and harmful interfacial side reactions between the solid electrolyte and lithium metal, thereby maintaining high lithium ion conductivity and reducing initial resistance while preserving the safety benefits of solid electrolytes.
Solution Approach 2:
The invention creates a composite structure consisting of the solid electrolyte combined with a silane compound coating layer. This composite material approach allows the system to benefit from both the safety characteristics of the solid electrolyte and the interfacial stability provided by the silane coating, resolving the contradiction between safety improvement and conductivity maintenance.
2Reliability
If a coating layer with silane compound is formed on the lithium ion conductor, then interfacial resistance is reduced and resistance to reduction reactions is enhanced, but device complexity increases
Solution Approach 1:
The silane compound coating layer is applied as a thin film on the surface of the lithium ion conductor. This thin film approach provides the necessary protective function against interfacial side reactions and reduces interfacial resistance without adding significant structural complexity or volume to the battery system, making the solution practical for real-world applications.
3Reliability
If a coating layer is formed by mixing silane compound with lithium ion conductor and solvent followed by drying, then electrochemical stability is improved, but manufacturing process complexity increases
Solution Approach 1:
The silane compound coating layer is formed in advance before the battery is assembled and put into operation. This preliminary action ensures that the protective coating is already in place to prevent interfacial side reactions from the very beginning of battery operation, thereby improving electrochemical stability without requiring complex in-situ treatment processes later.
Solution Approach 2:
The coating process utilizes changes in physical parameters such as solvent evaporation during drying to transform the mixed solution into a solid coating layer. This parameter-based approach allows for a relatively simple manufacturing process that can be easily integrated into existing production lines while effectively improving electrochemical stability.
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 composite solid electrolyte significantly reduces interfacial resistance and improves ion conductivity and electrochemical stability, enabling stable operation of lithium batteries with enhanced charge-discharge characteristics.
Implementation Method 1
a coating layer on the lithium ion conductor, the coating layer including a silane compound
Implementation Method 2
drying the mixed solution
Data Source
AI summary
A composite solid electrolyte, including: a lithium ion conductor, and a coating layer on the lithium ion conductor, the coating layer including a silane compound represented by Formula 1:(—O)y—Si—(R1)x Formula 1wherein, in Formula 1,1≤x≤3; 1≤y≤3; x+y=4;R1 is hydrogen, a halogen, a substituted or unsubstituted C1-C30 alkyl group, a substituted or unsubstituted C2-C30 alkenyl group, a substituted or unsubstituted C2-C30 alkynyl group, a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C6-C30 aryloxy group, a substituted or unsubstituted C7-C30 arylalkyl group, a substituted or unsubstituted C2-C30 heteroaryl group, a substituted or unsubstituted C2-C30 heteroaryloxy group, a substituted or unsubstituted C3-C30 heteroarylalkyl group, a substituted or unsubstituted C4-C30 carbocyclic group, a substituted or unsubstituted C5-C30 carbocyclic alkyl group, a substituted or unsubstituted C2-C30 heterocyclic group, or a substituted or unsubstituted C2-C30 heterocyclic alkyl group.