Lithium Battery Electrolyte Compound for SEI Stability and Output
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in improving life-span characteristics and output characteristics, particularly in applications requiring high performance like electric vehicles.
Innovation Solution
A novel compound represented by Formula 1 is incorporated into the electrolyte, which is prepared by reacting a sulfonate-based or sulfate-based salt with an alkali metal phosphate-based salt, forming a solid electrolyte interface (SEI) film that enhances conductivity and reduces decomposition of organic solvents, thereby improving battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional electrolyte compositions are used, then the battery can operate, but life-span characteristics and capacity retention rate deteriorate during repeated charging and discharging
Solution Approach 1:
The patent introduces a novel compound with specific molecular structure (Formula 1) containing P, S, F, and Li elements, where the chemical composition and atomic ratios are precisely controlled (P: 0.1-5.0 wt%, S: 0.1-5.0 wt%, F: 0.1-5.0 wt%, Li: 0.1-5.0 wt%). This parameter optimization enables the compound to form a stable SEI film that improves capacity retention rate while extending battery life-span through repeated charging-discharging cycles.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the novel compound (containing P, S, F, Li) with conventional electrolyte components. This composite approach allows the novel compound to form a protective SEI film on the anode while maintaining the overall electrolyte's conductivity and solvation capabilities, thereby simultaneously improving life-span characteristics and capacity retention rate.
2Power
If electrolyte composition is varied to improve output characteristics, then conductivity of lithium ions may be enhanced, but life-span characteristics may deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of the novel compound in the electrolyte (P: 0.1-5.0 wt%, S: 0.1-5.0 wt%, F: 0.1-5.0 wt%, Li: 0.1-5.0 wt%) to achieve a balance between output characteristics and life-span characteristics. The compound forms a stable SEI film that reduces resistance and improves lithium ion conductivity, enhancing power output while the stable film structure prevents degradation during long-term cycling, thereby extending battery life.
3Duration of action of stationary object
If a solid electrolyte interface (SEI) film is firmly formed on the anode, then life-span characteristics improve, but conductivity of lithium ions may be reduced
Solution Approach 1:
The patent applies the novel compound specifically at the anode interface where it forms a protective SEI film with different properties than the bulk electrolyte. The SEI film has high stability and low resistance characteristics that improve life-span, while the bulk electrolyte maintains high lithium ion conductivity. This local differentiation allows simultaneous achievement of long battery life and high conductivity.
Solution Approach 2:
The novel compound acts as an intermediary that forms a SEI film between the anode and the bulk electrolyte. This SEI film serves as a mediator that protects the anode from degradation (improving life-span) while maintaining adequate lithium ion transport (preserving conductivity). The compound's molecular structure with P, S, F, and Li elements enables it to fulfill both protective and conductive functions.
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 novel compound improves the life-span characteristics and output characteristics of lithium secondary batteries by forming a stable SEI film, reducing cathode interface resistance, and enhancing lithium ion mobility.
Implementation Method 1
forming a solid electrolyte interface (SEI) film that enhances conductivity and reduces decomposition of organic solvents
Implementation Method 2
a process of intercalating and deintercalating lithium ions from lithium metal oxide particles and graphite is repeated, such that charging and discharging may be performed
Data Source
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AI summary
According to exemplary embodiments of the present invention, there is provided a novel compound represented by a specific formula. The electrolyte for a lithium secondary battery according to exemplary embodiments may include the compound.