Lithium Battery Electrolyte Additive for Cathode Interface Stability
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Solution Overview
Problem
Lithium secondary batteries face issues with thermal and chemical stability due to surface damage of nickel-based lithium metal oxide and side reactions with the electrolyte, leading to decreased output and capacity, especially under high-temperature conditions.
Innovation Solution
An electrolyte solution for lithium secondary batteries is developed, comprising a specific additive represented by Chemical Formula 1, an organic solvent, and a lithium salt, which includes a compound like (5-ethyl-1,3-dioxan-5-yl)methyl acrylate, along with auxiliary additives such as cyclic carbonate compounds, to form a robust solid electrolyte membrane and enhance high-temperature storage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If nickel-based lithium metal oxide is used as cathode material, then high energy density and high operating voltage are achieved, but surface damage and side reactions occur leading to decreased stability
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary substance between the nickel-based cathode material and the electrolyte. This compound forms a stable interfacial layer that mediates the interaction, preventing direct harmful reactions while allowing ionic transport, thus resolving the contradiction between high energy density and stability
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating fluorinated cyclic carbonate compounds with specific molecular structures and ratios. This parameter change alters the interfacial properties and reaction characteristics, enabling the system to achieve both high energy density and improved thermal/chemical stability
2Productivity
If repeated charging and discharging is performed, then battery capacity is utilized, but surface damage to cathode material accumulates and side reactions increase
Solution Approach 1:
The patent applies preliminary action by having the fluorinated cyclic carbonate compound react first during initial cycles to form a stable protective interface layer on the cathode material surface. This pre-formed layer prevents subsequent degradation reactions during repeated charging and discharging, maintaining capacity retention
Solution Approach 2:
The fluorinated cyclic carbonate compound acts as a mediator that facilitates reversible ionic transport while protecting the cathode material from irreversible degradation during cycling. This intermediary function enables sustained productivity without compromising reliability
3Reliability
If high-temperature storage is performed, then battery performance is tested, but solvent decomposition and gas generation occur
Solution Approach 1:
The patent converts the potential harm of high-temperature storage by using fluorinated cyclic carbonate compounds that are specifically designed to be thermally stable. These compounds resist decomposition at high temperatures and instead form protective layers, turning the high-temperature condition into an opportunity to demonstrate and enhance battery stability
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 battery's thermal and chemical stability, maintaining high output and capacity retention under high-temperature conditions by preventing solvent decomposition and gas generation, while reducing battery thickness increase.
Implementation Method 1
an additive including a compound represented by Chemical Formula 1... to form a robust solid electrolyte membrane and enhance high-temperature storage characteristics
Data Source
Figure 1~2
AI summary
According to an exemplary embodiment, an electrolyte solution for a lithium secondary battery including 1,3-dioxane additive; an organic solvent; and a lithium salt may be provided. Thereby, the lithium secondary battery including the electrolyte solution for a lithium secondary battery may implement improved high-temperature storage characteristics.