Secondary Battery Electrolyte Additive for Anode SEI Stability
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Solution Overview
Problem
Existing lithium secondary batteries face issues with voltage, life, capacity, and high-temperature stability due to the reactivity of aqueous electrolytes and the variability of materials used for the anode, cathode, and electrolyte, necessitating an improved electrolyte solution for enhanced performance.
Innovation Solution
An electrolyte solution for secondary batteries incorporating a first additive represented by Formula 1, along with other additives like lithium difluorophosphate, lithium difluoro(oxalato)borate, and unsaturated cyclic carbonates, forms a stable solid electrolyte interphase (SEI) film on the anode surface, minimizing resistance and preventing degradation, thereby improving room-temperature cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an aqueous electrolyte solution is used, then high ionic conductivity is achieved, but reactivity with lithium increases causing poor stability
Solution Approach 1:
The patent introduces a novel compound as an intermediary substance between lithium and the electrolyte solution. This compound forms a stable interface layer that mediates the interaction, preventing direct harmful reactions between lithium and the electrolyte while maintaining ionic conductivity. The compound acts as a protective mediator that enables stable battery operation.
2Reliability
If conventional electrolyte materials are used, then basic battery function is achieved, but life characteristics and high-temperature stability vary greatly and are insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the electrolyte system by introducing a novel compound with specific molecular structure and properties. This parameter change in the electrolyte composition leads to improved life characteristics and high-temperature stability, making the battery performance more consistent across different operating conditions.
3Reliability
If organic electrolyte solution is used instead of aqueous, then stability at high voltage is improved, but viscosity increases and ionic conductivity decreases
Solution Approach 1:
The patent creates a composite electrolyte system by combining the novel compound with existing organic electrolyte components. This composite approach allows the system to maintain the high voltage stability of organic electrolytes while the novel compound modifies the physical properties to reduce viscosity and improve ionic conductivity, achieving a balanced performance.
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 solution enhances the room-temperature cycle performance of secondary batteries by forming a stable SEI film that reduces resistance and maintains passivation capability, thus improving the battery's cycle life and high-temperature stability.
Implementation Method 1
forms a stable solid electrolyte interphase (SEI) film on the anode surface, minimizing resistance and preventing degradation
Data Source
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AI summary
The present disclosure relates to a compound for an electrolyte solution, a compound for an electrolyte solution additive, an electrolyte solution material, an electrolyte solution additive, an electrolyte solution for a secondary battery, and a secondary battery, and provides an electrolyte solution for a secondary battery, including a novel compound, or an isomer thereof.