Lithium Battery Electrolyte Additives for Stable High-Temperature Storage
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Solution Overview
Problem
Rechargeable lithium batteries face issues with gas generation and resistance increase during high-temperature storage, as well as compromised cycle-life characteristics.
Innovation Solution
An electrolyte comprising a non-aqueous organic solvent, a lithium salt, and an additive including a first compound represented by Chemical Formula 1 and a borate-based lithium salt compound, which forms stable films on electrode surfaces to suppress gas generation and resistance, and enhances charge/discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in rechargeable lithium batteries, then basic battery operation is maintained, but gas generation and resistance increase occur during high-temperature storage
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary substance in the electrolyte that mediates between the electrode and conventional electrolyte components. This compound forms a protective interface layer that prevents harmful reactions and suppresses gas generation during high-temperature storage, while maintaining basic electrolyte functionality.
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorinated cyclic carbonate compound with conventional cyclic and chain carbonate solvents. This composite approach leverages the stability benefits of fluorinated compounds while retaining the ionic conductivity advantages of traditional electrolyte components, achieving both high-temperature stability and low gas generation.
2Duration of action of stationary object
If conventional electrolytes are used in rechargeable lithium batteries, then charge/discharge operation is maintained, but cycle-life characteristics are compromised
Solution Approach 1:
The fluorinated cyclic carbonate compound performs preliminary protective action by forming a stable surface film on electrodes during initial cycles. This pre-formed protective layer prevents subsequent degradation reactions and maintains performance consistency throughout the battery's operational life, extending cycle-life characteristics.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating fluorinated cyclic carbonate compound. This parameter change alters the electrochemical stability window and surface interaction properties, resulting in improved cycle-life characteristics and more consistent performance over repeated charge/discharge cycles.
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 electrolyte effectively reduces gas generation and resistance increase, improving the cycle-life characteristics of rechargeable lithium batteries.
Implementation Method 1
a borate-based lithium salt compound, which forms stable films on electrode surfaces to suppress gas generation and resistance
Implementation Method 2
Both the positive and negative electrodes include an active material in which intercalation and deintercalation of lithium ions are possible... the rechargeable lithium battery generates electrical energy caused by oxidation and reduction reactions
Implementation Method 3
Both the positive and negative electrodes include an active material in which intercalation and deintercalation of lithium ions are possible
Implementation Method 4
the electrolyte... serves as a medium for transmitting ions that participate in an electrochemical reaction of the battery
Data Source
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AI summary
Electrolytes and rechargeable lithium batteries are provided. The electrolytes comprise a non-aqueous organic solvent, a lithium salt, and an additive. The additive comprises a first compound represented by Chemical Formula 1, and a borate-based lithium salt compound. A detailed description of Chemical Formula 1 is as disclosed in the specification.