Electrolyte and second battery comprising same
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Solution Overview
Problem
Lithium secondary batteries face challenges in improving output characteristics, high-temperature storage stability, and reducing gas generation and thickness increase rates due to poor electrolyte additives, which affect discharge resistance and cycle life.
Innovation Solution
An electrolyte composition including an organic solvent, lithium salt, a first additive with a lithium or sodium cation and specific anion, and a second additive with a symmetric structure and electronegative atomic group, which reduces discharge resistance and gas generation, and enhances high-temperature recovery capacity and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte additives are used, then basic battery function is maintained, but output characteristics and high temperature storage characteristics deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte additive by introducing a specific molecular structure with a carbonyl group adjacent to a nitrogen atom in a five-membered ring, and controlling the ratio of fluorine to other halogen atoms. This parameter optimization resolves the contradiction by achieving both improved high temperature storage stability and maintained output characteristics.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the specific additive compound with conventional electrolyte components (lithium salt, organic solvent). This composite approach allows the specialized additive to address high temperature storage issues while the conventional components maintain basic battery function and output characteristics.
2Stability of the object's composition
If electrolyte additive amount is increased to improve film characteristics, then film formation improves, but decomposition reactions increase causing cycle characteristic deterioration
Solution Approach 1:
The patent optimizes the concentration parameter of the electrolyte additive to a specific range (0.1-10 wt%). This parameter control ensures sufficient film formation while preventing excessive additive concentration that would cause decomposition reactions and cycle characteristic deterioration.
3Power
If electrolyte additive is used to improve output characteristics, then discharge resistance reduces, but gas generation and thickness increase rate increase
Solution Approach 1:
The patent modifies the chemical structure parameters of the electrolyte additive by introducing a carbonyl group adjacent to the nitrogen atom in the five-membered ring and controlling halogen atom ratios. This structural parameter change enables the additive to reduce discharge resistance while suppressing gas generation and thickness increase during battery operation.
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 electrolyte solution improves battery output, extends high-temperature storage life, and reduces internal resistance and thickness increase, leading to enhanced performance and stability.
Implementation Method 1
electricity is generated or consumed through oxidation-reduction reactions due to intercalation and de-intercalation at the positive and negative electrodes
Implementation Method 2
various studies are being conducted on organic solvents and additives as electrolyte components to improve battery characteristics such as output characteristics, cycle characteristics, preservation characteristics, and film characteristics
Data Source
AI summary
Disclosed is an electrolyte and a secondary battery containing the same. According to the present disclosure, charging efficiency and output may be improved due to low discharge resistance, and gas generation and thickness increase may be suppressed to provide a secondary battery with long-term lifespan and excellent high temperature capacity retention.