Secondary Battery Electrolyte Using Cyclic Nitrogen Compounds
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Solution Overview
Problem
Current secondary battery electrolytic solutions face challenges in achieving optimal battery characteristics, such as cycle stability and high energy density, particularly in severe environments like high temperatures, due to decomposition reactions.
Innovation Solution
The use of an electrolytic solution containing cyclic nitrogen compounds, specifically represented by chemical formulas (1) to (6), in combination with either a first nitrile compound or a second nitrile compound, which improves chemical stability and suppresses decomposition reactions, enhancing battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solutions are used, then basic battery function is maintained, but decomposition reactions occur in severe environments leading to poor cycle stability
Solution Approach 1:
The patent introduces a specific electrolyte additive (compound with formula (1)) that acts as an intermediary substance between the electrode and the main electrolyte. This additive preferentially reacts to form a protective interface layer that prevents harmful decomposition reactions of the main electrolyte, thereby improving cycle stability without sacrificing basic battery function.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolytic solution by incorporating a specific compound (formula (1)) with particular molecular structure characteristics. This parameter change in the electrolyte composition raises the decomposition potential and suppresses decomposition reactions under severe conditions, achieving better cycle stability.
2Quantity of substance
If electrolyte composition is optimized for high energy density, then energy storage capacity increases, but chemical stability in severe environments deteriorates
Solution Approach 1:
The patent creates a composite electrolyte system by combining the main electrolyte components (optimized for high energy density) with a specific stabilizing compound (formula (1)). This composite electrolyte composition achieves both high energy density from the main components and enhanced chemical stability from the stabilizing additive, even in severe environments.
3Power
If battery performance is enhanced for high power output, then energy delivery capability increases, but decomposition reactions are accelerated under severe conditions
Solution Approach 1:
The patent applies preliminary action by having the compound (formula (1)) react first during initial charging cycles to form a stable protective layer on the electrode surface. This pre-formed layer prevents subsequent decomposition reactions that would be accelerated by high power output, allowing high energy delivery capability without the harmful side effects.
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 proposed electrolytic solution significantly improves battery characteristics by suppressing decomposition reactions, leading to better cycle stability and energy density, even under severe conditions, thus enhancing the performance of secondary batteries.
Implementation Method 1
The electrolytic solution contains at least one kind of cyclic nitrogen compounds represented by chemical formulas (1) to (6) and at least one of a first nitrile compound represented by chemical formula (7) and a second nitrile compound represented by chemical formula (8)
Data Source
AI summary
The secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution including at least one kind of cyclic nitrogen compounds and at least one of a first nitrile compound and a second nitrile compound.