Electrolytic Solution for Secondary Battery High-Temperature Storage
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Solution Overview
Problem
Secondary batteries face inadequate storage characteristics, particularly at high temperatures, due to insufficient suppression of electrolyte decomposition and capacity retention.
Innovation Solution
An electrolytic solution comprising a solvent, an electrolyte salt, a diester compound, and sulfur-containing compounds, which form a protective film on the electrodes, preventing decomposition and enhancing electrochemical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used, then basic battery function is maintained, but storage characteristic is insufficient
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary substance that mediates between the electrode and the main electrolyte. This compound forms a protective interface layer (SEI film) on the electrode surface, preventing direct contact and decomposition reactions between the electrolyte and electrode, thereby improving storage characteristics without compromising basic battery function
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating fluorinated cyclic carbonate compounds with specific molecular structures (Formula 1) and controlling their concentration ratios relative to other electrolyte components. This parameter change enables the formation of more stable protective films, suppressing electrolyte decomposition during storage
2Reliability
If high-temperature storage is endured, then battery must maintain capacity, but electrolyte decomposition accelerates
Solution Approach 1:
The patent applies preliminary anti-action by pre-forming a stable protective film on the electrode surface using fluorinated cyclic carbonate compounds before actual battery operation and storage. This pre-formed film acts as a barrier that prevents high-temperature-induced decomposition reactions, allowing the battery to endure high-temperature storage while maintaining capacity
Solution Approach 2:
The patent creates a composite electrolyte system combining fluorinated cyclic carbonate compounds (Formula 1) with other carbonate esters and carboxylic acid esters. This composite formulation leverages the synergistic effects of different components, where the fluorinated compound provides high-temperature stability while other components maintain basic electrolyte functionality, enabling capacity retention under thermal stress
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 effectively suppresses electrolyte decomposition, maintaining battery capacity and achieving superior storage characteristics even in high-temperature environments.
Implementation Method 1
sulfur-containing compounds, which form a protective film on the electrodes
Implementation Method 2
sulfur-containing compounds, which form a protective film on the electrodes
Implementation Method 3
an electrolyte salt
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes a solvent, an electrolyte salt, a diester compound represented by Formula (1), and at least one of respective sulfur-containing compounds represented by Formulae (2) to (14).