Silatrane Electrolyte Coating for Stable Lithium Secondary Batteries
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Solution Overview
Problem
Lithium secondary batteries face degradation in lifespan and output due to side reactions between active material particles and the electrolyte, leading to mechanical and chemical damage, which affects their stability and capacity characteristics.
Innovation Solution
An electrolyte solution for secondary batteries comprising a lithium salt, a non-aqueous organic solvent, and a silatrane-based compound, which forms a coating layer on the negative electrode active material, limiting direct contact with the electrolyte and enhancing the bonding force of the coating layer, thereby improving stability and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the composition and structure of the active material are changed to enhance the stability of active material particles, then the stability is improved, but the conductivity is lowered and the output of the secondary battery is degraded
Solution Approach 1:
The silatrane-based compound acts as an intermediary substance that forms a coating layer between the active material particles and the electrolyte. This coating layer stabilizes the active material particles during charging and discharging cycles while maintaining electrical conductivity through the use of lithium salt and non-aqueous organic solvent in the electrolyte solution, thus resolving the contradiction between stability and output
2Productivity
If active material particles are used in the negative electrode or positive electrode, then the battery can be charged and discharged, but side reactions with the electrolyte occur causing mechanical and chemical damage
Solution Approach 1:
The silatrane-based compound performs preliminary action by forming a protective coating layer on the active material particles before they undergo side reactions with the electrolyte. This pre-formed coating prevents mechanical cracking and chemical degradation during repeated charging and discharging cycles, thereby improving lifespan stability while maintaining productivity
3Stability of the object's composition
If a coating layer is formed on the negative electrode active material to limit contact with electrolyte, then stability is improved, but the bonding force of the coating layer may be insufficient without proper additives
Solution Approach 1:
The invention uses a composite approach by combining the silatrane-based compound with specific additives (fluorine-containing carbonate-based compound, vinylidene carbonate-based compound, or sulfinyl group-containing compound) in the electrolyte solution. This composite formulation enhances the bonding force of the coating layer formed on the negative electrode active material while maintaining its stability, preventing both delamination and degradation
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 silatrane-based compound in the electrolyte solution enhances the high-temperature storage and capacity characteristics of secondary batteries by forming a stable coating layer on the negative electrode, reducing volume change and maintaining chemical bonds, thus improving the battery's lifespan and output.
Implementation Method 1
the silatrane-based compound... forms a coating layer on the negative electrode active material, limiting direct contact with the electrolyte and enhancing the bonding force of the coating layer
Data Source
AI summary
An electrolyte solution for a secondary battery according to an exemplary embodiment includes a lithium salt, a non-aqueous organic solvent, and a silatrane-based compound represented by Chemical Formula 1. By including the electrolyte solution for a secondary battery according to an exemplary embodiment, a secondary battery can exhibit improved storage characteristics and improved capacity characteristics.