Electrolyte solution for batteries and secondary battery including the same
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining high output and capacity retention at various temperatures, especially outdoors, and experience increased resistance and gas generation, which affects their performance and lifespan.
Innovation Solution
An electrolyte solution for batteries incorporating a specific compound with a halogen substituent, an organic sulfur compound, and lithium salts, which reduces discharge resistance and enhances high-temperature storage characteristics by forming a stable film on electrodes, suppressing gas generation and improving ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electrolyte solutions are used to enable lithium ion movement and electrical energy conversion, then basic battery function is achieved, but discharge resistance increases and output characteristics deteriorate over time
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte solution by introducing a boron-containing compound with specific molecular structure (Formula 1) and controlling its concentration (0.01-5% by weight). This parameter change transforms the electrolyte's ability to form protective films on electrodes, thereby reducing discharge resistance and improving power output without sacrificing reliability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the boron-containing compound (Formula 1) with conventional electrolyte components including carbonates (EC, DEC, EMC, DMC), cyclic carbonates (PC), and lithium salts (LiPF6, LiBF4). This composite formulation synergistically improves both power output and discharge resistance characteristics.
2Power
If batteries operate at high temperatures to maintain performance, then output is sustained, but gas generation increases and storage characteristics deteriorate
Solution Approach 1:
The patent converts the potentially harmful effect of high-temperature operation into a beneficial outcome by using the boron-containing compound to form a stable protective film on electrode surfaces. This film prevents unwanted side reactions and gas generation that would otherwise occur at elevated temperatures, thereby allowing high-temperature operation without the harmful effects.
Solution Approach 2:
The boron-containing compound acts as an intermediary substance between the electrolyte and electrode surfaces. It forms a protective interface layer that mediates the interaction at high temperatures, preventing direct contact between the electrolyte and electrodes that would cause gas generation and deterioration.
3Quantity of substance
If electrolyte composition is optimized for high capacity, then battery capacity increases, but long-term storage stability and recovery capacity at high temperatures decrease
Solution Approach 1:
The boron-containing compound performs preliminary action by forming a stable protective film on electrode surfaces during initial cycles. This pre-formed film prevents subsequent degradation reactions during long-term storage and high-temperature operation, thereby preserving battery capacity and storage stability over extended periods.
4Power
If conventional electrolyte additives are used to improve performance, then output characteristics improve slightly, but gas generation is not significantly reduced and high-temperature storage characteristics remain poor
Solution Approach 1:
The patent applies local quality by concentrating the boron-containing compound at the electrode-electrolyte interface where it forms a localized protective film. This localized action effectively suppresses gas generation and improves storage stability at the critical interface region without requiring high bulk concentrations, thereby achieving significant performance improvement with minimal additive amounts.
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 significantly improves battery output, reduces discharge resistance, and extends the lifespan by maintaining high recovery capacity and stability at elevated temperatures, making it suitable for automotive and energy storage systems.
Implementation Method 1
an electrolyte solution contained between a cathode and an anode enables smooth movement of lithium ions
Implementation Method 2
electricity is generated or consumed by oxidation-reduction reaction according to insertion and desorption at the cathode and the anode
Data Source
AI summary
The present invention relates to an electrolyte solution additive, an electrolyte solution for batteries, and a secondary battery including the same. According to the present invention, the present invention has an effect of providing a secondary battery having improved charging efficiency and output due to low discharge resistance and having a long lifespan and excellent high-temperature capacity retention rate by suppressing gas generation.