Lithium Battery Electrolyte Additive Suppresses Gas Generation
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Solution Overview
Problem
Lithium secondary batteries experience performance deterioration and swelling due to gas generation during charging and discharging, leading to potential explosions and reduced cycle life, particularly at high temperatures.
Innovation Solution
Incorporating a non-aqueous organic solvent electrolyte with a lithium salt and an additive compound represented by Chemical Formula 1, which forms a rigid solid electrolyte interface (SEI) film and a protective layer on the electrodes, reducing gas generation and enhancing cycle-life characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium secondary batteries, then the battery can operate, but gas is generated during charging and discharging causing swelling and performance deterioration
Solution Approach 1:
The patent introduces a novel electrolyte composition as an intermediary substance between the electrodes. This electrolyte contains specific additives (0.1-5 wt% of compound A and 0.1-5 wt% of compound B) that mediate the interaction between electrodes and conventional electrolyte, forming a protective interface layer that prevents direct harmful reactions and reduces gas generation while maintaining ionic conductivity.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by incorporating specific compounds (compound A with formula (CH3)2N-BH3 and compound B with formula (CH3)2N-BH2-X where X is a halogen). These parameter changes in electrolyte composition lead to the formation of a stable solid electrolyte interface (SEI) layer that suppresses gas-generating side reactions during charging and discharging cycles.
2Stability of the object's composition
If conventional electrolytes are used, then the battery shows initial performance, but thickness changes and swelling occur during operation
Solution Approach 1:
The novel electrolyte composition acts as a mediator that forms a stable protective layer on the electrode surfaces. This intermediary layer prevents the conventional electrolyte from causing swelling and thickness changes, thereby stabilizing the battery's physical dimensions during charging and discharging operations.
Solution Approach 2:
By changing the electrolyte composition to include compounds A and B, the patent modifies the chemical parameters that control interface stability. This leads to the formation of a mechanically stable solid electrolyte interface that prevents swelling and maintains constant battery thickness during operation.
3Reliability
If standard electrolyte composition is used, then the battery operates, but performance deteriorates at high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by incorporating thermally stable compounds (compound A: (CH3)2N-BH3 and compound B: (CH3)2N-BH2-X). These compositional changes enhance the thermal stability of the solid electrolyte interface, allowing the battery to maintain performance and prevent degradation even at elevated operating temperatures.
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 solution significantly reduces gas generation and thickness changes during charging and discharging, improving the cycle-life and stability of lithium secondary batteries, preventing swelling and maintaining performance at high temperatures.
Implementation Method 1
Incorporating a non-aqueous organic solvent electrolyte with a lithium salt and an additive compound represented by Chemical Formula 1, which forms a rigid solid electrolyte interface (SEI) film and a protective layer on the electrodes
Data Source
AI summary
The present invention relates to a lithium secondary battery including an electrolyte including a non-aqueous organic solvent, a lithium salt and an additive comprising a compound represented by Chemical Formula 1; and a battery case in which the electrolyte is housed, wherein the battery case has a shape with a width (W), a height (H), and a thickness (Th), when a maximum value among the width (W), the height (H), and the thickness (Th) is a and a minimum value among the width (W), the height (H), and the thickness (Th) is b, b/a is 0.01 or more:wherein, in Chemical Formula 1, A is a substituted or unsubstituted aliphatic chain or (—C2H4—O—C2H4-)n, and n is an integer from 1 to 10.