Silane Electrolyte Additive for High-Temperature Lithium Battery Cycle Life
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Solution Overview
Problem
Lithium secondary batteries face challenges with lifespan characteristics and high-temperature stability due to side reactions between the cathode/anode and the electrolyte when using organic electrolytes containing lithium salts.
Innovation Solution
Incorporating a specific electrolyte additive represented by Formula 1, which interacts with transition metal ions to cap and deactivate reaction centers, thereby suppressing gas generation and improving cycle life characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an organic electrolyte containing a lithium salt is used, then the battery can operate at high voltage, but lifespan characteristics and high-temperature stability deteriorate due to side reactions between the cathode/anode and the electrolyte
Solution Approach 1:
The patent introduces a silane-based electrolyte additive that acts as an intermediary substance between the electrode and the bulk electrolyte. This additive preferentially reacts with transition metal ions on the electrode surface to form a protective silane-derived coating layer, which mediates the interaction between the electrode and electrolyte, preventing direct harmful side reactions while maintaining ionic conductivity.
Solution Approach 2:
The silane additive performs preliminary protective action by forming a stable coating layer on the electrode surface before significant degradation can occur. This pre-formed protective layer prevents subsequent harmful side reactions between the electrolyte and electrode materials during high-temperature operation and cycling, thereby extending battery lifespan.
2Reliability
If conventional electrolytes are used, then the battery structure remains simple, but gas generation occurs and cycle life characteristics deteriorate due to side reactions
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by incorporating silane-based additives with specific molecular structures (containing Si-H, Si-O, or Si-C bonds). This parameter change in the electrolyte composition enables the formation of protective coatings that suppress gas generation and improve cycle life, while maintaining reasonable electrolyte complexity.
3Temperature
If the electrolyte is stable at high voltage, then the battery can operate efficiently, but side reactions with the cathode/anode occur, reducing high-temperature stability
Solution Approach 1:
The silane additive serves as a mediator that forms a protective interface layer between the electrode and electrolyte. This intermediary layer selectively prevents harmful side reactions between the high-voltage-stable electrolyte and the electrode materials at high temperatures, while allowing beneficial electrochemical reactions to proceed.
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 use of the electrolyte additive enhances the high-temperature resistance and cycle stability of lithium secondary batteries by reducing electrical resistance and preventing structural damage to the electrodes.
Implementation Method 1
the compound of Formula 1... interacts with transition metal ions to cap and deactivate reaction centers
Data Source
AI summary
Provided are an electrolyte additive for lithium secondary battery including a compound represented by Formula 1 below, an electrolyte for lithium secondary battery including the same, and a lithium secondary battery including the electrolyte.wherein, in Formula 1, R1 to R3 are as defined in the detailed description.