Sultone Electrolyte Additive for Stable SEI at High Temperature
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Solution Overview
Problem
Lithium secondary batteries suffer from performance deterioration due to the decomposition of electrolyte components, leading to structural collapse of the positive electrode and elution of transition metal ions, which increase resistance and reduce battery lifespan, especially at high temperatures.
Innovation Solution
A non-aqueous electrolyte solution additive containing a sultone-based compound forms a stable solid-electrolyte interphase (SEI) on the electrode surface, reducing resistance and enhancing high-temperature performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte components are used, then the battery can operate normally, but the electrolyte decomposes at high temperatures causing positive electrode structural collapse and transition metal ion elution, which increases resistance and reduces battery lifespan
Solution Approach 1:
The sultone-based compound acts as an intermediary substance that reacts with transition metal ions to form stable complexes, preventing these ions from eluting and depositing on electrodes. This mediator approach resolves the contradiction by introducing a new component that specifically addresses the harmful ion elution without compromising the electrolyte's normal function
Solution Approach 2:
The sultone-based compound performs preliminary action by forming a protective complex with transition metal ions before they can cause damage to the positive electrode structure or deposit on electrodes. This preventive complexation occurs in advance, stopping the degradation pathway at its source
2Use of energy by moving object
If the positive electrode potential is increased to improve energy density, then the battery capacity increases, but the electrolyte decomposition is accelerated and battery deterioration worsens
Solution Approach 1:
The sultone-based compound serves as a protective intermediary that stabilizes the high-potential positive electrode environment by complexing with transition metal ions. This allows the system to maintain higher electrode potentials for improved energy density while the mediator prevents the associated degradation
3Speed
If the battery is exposed to high temperature to improve reaction kinetics, then the charging and discharging speed increases, but the electrolyte decomposition accelerates and battery life decreases
Solution Approach 1:
The sultone-based compound converts the harmful effect of high temperature into a beneficial outcome by forming thermally stable complexes with transition metal ions. The compound's thermal stability allows it to withstand high-temperature operation while preventing ion elution, thus enabling fast kinetics without sacrificing battery life
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 sultone-based compound forms a robust SEI layer, improving lithium secondary battery lifespan and maintaining performance under high-temperature conditions.
Implementation Method 1
a non-aqueous electrolyte solution additive including a sultone-based compound as a non-aqueous electrolyte solution additive capable of forming a solid-electrolyte interphase (SEI) on an electrode surface
Data Source
AI summary
The present invention relates to a non-aqueous electrolyte solution additive capable of improving lifespan characteristics of a lithium secondary battery by forming a solid-electrolyte interphase that is stable even at a high temperature and has low resistance when applied to a non-aqueous electrolyte solution, and relates to a non-aqueous electrolyte solution additive including a sultone-based compound represented by Formula I, a non-aqueous electrolyte solution including the same, and a lithium secondary battery.