Organic Electrolytic Solution with Disultone and Silicon Additives
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Solution Overview
Problem
Lithium batteries face issues with irreversible side reactions between organic electrolytic solutions and electrodes, leading to decreased lifespan characteristics and high-temperature stability.
Innovation Solution
An organic electrolytic solution comprising a lithium salt, an organic solvent, a disultone-based compound, and a silicon-based compound is used, which forms a stable solid electrolyte interface (SEI) layer and protection layer on the electrodes, reducing irreversible reactions and enhancing thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an organic electrolytic solution is used in a lithium battery, then high voltage operation is enabled, but irreversible side reactions occur between the electrolytic solution and electrodes, leading to decreased lifespan characteristics and high-temperature stability
Solution Approach 1:
A coating layer comprising a silane compound and a sultone-based compound is formed on the surface of the electrodes, serving as an intermediary barrier between the organic electrolytic solution and the electrode materials. This coating layer prevents direct contact and irreversible side reactions while allowing lithium ion transport, thereby resolving the contradiction between enabling high voltage operation and maintaining reliability.
Solution Approach 2:
The coating layer uses a composite system combining silane compounds (for structural framework and thermal stability) with sultone-based compounds (for SEI formation and surface passivation). This composite approach provides synergistic effects that simultaneously protect against side reactions, maintain ion conductivity, and improve high-temperature stability, thus resolving the reliability issue while preserving high voltage operation capability.
2Productivity
If a conventional organic electrolytic solution is used, then the battery can operate, but side reactions cause degradation of the electrolytic solution and electrode materials over time
Solution Approach 1:
The coating layer is formed preliminarily on the electrode surfaces before the battery undergoes normal operation. This preliminary protective layer prevents subsequent degradation reactions by blocking direct contact between the electrolytic solution and electrode materials, thereby extending battery lifespan while maintaining operational productivity.
Solution Approach 2:
The silane compound undergoes controlled hydrolysis and condensation reactions to form the protective coating layer, converting potentially harmful side reactions into a beneficial protective mechanism. The coating layer that would otherwise be considered a barrier is actually beneficial as it prevents more severe degradation reactions while maintaining ion transport.
3Device complexity
If no protective coating is applied to the electrodes, then the battery structure is simple, but irreversible side reactions occur leading to decreased performance and stability
Solution Approach 1:
The invention changes the surface properties of the electrodes by forming a coating layer with different chemical and physical parameters compared to the bulk electrode materials. This surface modification provides thermal stability and chemical inertness at the electrode-electrolyte interface, improving high-temperature reliability without significantly complicating the overall battery structure.
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 improves the lifespan characteristics and high-temperature stability of lithium batteries by forming stable SEI and protection layers, reducing internal resistance and preventing solvent permeation, thereby extending battery life and performance under high temperatures.
Implementation Method 1
forms a stable solid electrolyte interface (SEI) layer and protection layer on the electrodes
Implementation Method 2
an organic electrolytic solution, which is prepared by dissolving a lithium salt in an organic solvent
Implementation Method 3
enhancing thermal stability
Data Source
AI summary
An organic electrolytic solution includes: a lithium salt; an organic solvent; a disultone-based compound represented by Formula 1; and a silicon-based compound represented by Formula 2:wherein in Formulae 1 and 2,A1, A2, A3, and A4 are each independently selected from a substituted or unsubstituted C1 to C5 alkyl group; a carbonyl group; or a sulfinyl group,n1 to n4 each are independently an integer from 1 to 3,when each of n1 to n4 is 2 or more, a plurality of A1, A2, A3, or A4 are identical or different,X is N or O, and n is 0 or 1, when X is O, n is 0,Y is a covalent bond, a carbonyl group, or —N═C(Rf)—, andRa, Rb, Rc, Rd, and Re are the same as described in the detailed description.