Electrolyte Additives for High-Voltage Li-Ion Storage Stability
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Solution Overview
Problem
Lithium-ion batteries face safety issues due to high voltage, which increases energy density but poses serious safety problems, necessitating a solution to enhance performance while mitigating these risks.
Innovation Solution
An electrolytic solution comprising specific compounds, such as those of Formula I and II, along with a lithium salt additive and copper ions, is used in an electrochemical device to improve energy density and safety by reducing storage impedance and swelling, and enhancing overcharge and hot box performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high voltage is used to improve energy density, then energy density is improved, but safety problems worsen
Solution Approach 1:
The patent introduces a film-forming additive as an intermediary substance that mediates between the high voltage cathode and the electrolyte. This additive forms a protective interface layer that enables high voltage operation while preventing harmful reactions, thus resolving the safety issue without sacrificing energy density
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by adding specific film-forming additives (compounds with Formula I and carboxylate compounds). This parameter change modifies the electrolyte's properties to enable stable operation at high voltages, simultaneously achieving high energy density and safety
2Use of energy by moving object
If high voltage is used to improve energy density, then energy density is improved, but storage impedance increases
Solution Approach 1:
The film-forming additive acts as an intermediary that creates a stable interface between the electrode and electrolyte, preventing impedance increase during storage while maintaining high voltage operation capability
3Use of energy by moving object
If high voltage is used to improve energy density, then energy density is improved, but storage swelling increases
Solution Approach 1:
The patent modifies the electrolyte composition by adding film-forming additives that change the interfacial properties between electrode and electrolyte. This parameter change prevents swelling during storage while maintaining high voltage operation, thus resolving the contradiction between energy density and storage 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 electrolytic solution effectively reduces storage impedance, improves overcharge and hot box performance, and stabilizes the electrochemical device, thereby addressing safety concerns and enhancing lithium-ion battery performance.
Implementation Method 1
An electrolytic solution comprising specific compounds, such as those of Formula I and II, along with a lithium salt additive and copper ions, is used in an electrochemical device
Data Source
AI summary
An electrolytic solution includes the compound of Formula I and a carboxylate compound:The electrochemical device prepared with the electrolytic solution has reduced storage impedance, and improved post-storage swelling, overcharge performance and hot box performance.