Non-Aqueous Battery Electrolyte for High-Voltage Salt Decomposition Control
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Solution Overview
Problem
Lithium secondary batteries face performance deterioration and decomposition issues under high voltage and high temperature conditions due to the thermal decomposition of lithium salts, leading to the generation of harmful decomposition products like PF5 and HF.
Innovation Solution
Incorporating an aminopyrazole-based compound represented by Formula 1 into the non-aqueous electrolyte solution, which suppresses the decomposition reaction of lithium salts and reduces the generation of harmful decomposition products, thereby preventing electrode film destruction and transition metal elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium secondary batteries are operated under high voltage and high temperature conditions, then energy density and operating voltage are improved, but decomposition reactions of lithium salts occur generating harmful products like PF5 and HF
Solution Approach 1:
The patent introduces a pyrazole-based compound as an intermediary substance in the electrolyte that mediates between the lithium salt and the electrode film. This compound preferentially reacts with lithium salt decomposition products (PF5, HF) to form stable complexes, preventing these harmful substances from attacking and destroying the electrode film. The pyrazole compound acts as a sacrificial intermediary that protects the critical electrode structure.
Solution Approach 2:
The patent converts the harmful decomposition reaction into a beneficial process by directing the decomposition toward the pyrazole compound instead of the electrode film. The lithium salt decomposition products that would normally be harmful are now converted into stable pyrazole complexes, transforming a destructive chemical reaction into a protective mechanism that maintains electrode integrity while allowing high voltage operation.
2Temperature
If lithium salts decompose under high temperature conditions, then thermal energy is released, but electrode film destruction and transition metal elution occur
Solution Approach 1:
The pyrazole-based compound performs preliminary protective action by being present in the electrolyte before high temperature operation begins. It proactively scavenges any decomposition products as they form, preventing them from accumulating and attacking the electrode film. This preliminary presence ensures immediate protection when thermal decomposition is triggered by elevated operating temperatures.
3Duration of action of stationary object
If decomposition products accumulate in the electrolyte, then electrolyte decomposition reaction continues, but battery performance deteriorates
Solution Approach 1:
The patent establishes a feedback mechanism where the pyrazole compound continuously monitors and neutralizes decomposition products in the electrolyte. As decomposition products accumulate, the pyrazole molecules preferentially bind with them, forming stable complexes that remove the harmful substances from the electrolyte environment. This continuous neutralization feedback prevents the autocatalytic degradation that would otherwise lead to performance deterioration and limits battery aging.
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 use of the aminopyrazole-based compound effectively suppresses the generation of decomposition products, enhancing the electrochemical properties and stability of lithium secondary batteries, especially under high voltage and high temperature conditions.
Implementation Method 1
the compound represented by Formula 1 suppresses a decomposition reaction of the lithium salt more effectively than the conventional electrolyte solution
Implementation Method 2
preventing the destruction of an electrode film and the elution of transition metals due to the decomposition products
Data Source
AI summary
The present invention relates to: a non-aqueous electrolyte solution for a lithium secondary battery, which includes a compound represented by Formula 1, a lithium salt, and an organic solvent; and a lithium secondary battery including the same.