Organic Electrolytic Solution for Lithium Battery Stability
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Solution Overview
Problem
Lithium batteries face issues with battery thickness variation and instability due to decomposition of organic solvents, leading to increased internal pressure and reduced performance and safety, as conventional additives do not sufficiently prevent gas generation and ion mobility issues.
Innovation Solution
An organic electrolytic solution comprising a lithium salt, a high dielectric constant solvent, a low boiling point solvent, and a compound represented by specific formulas, which reacts with the anode surface to form a stable SEI film, suppressing decomposition and swelling through strong adhesion and chemical bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional organic electrolytic solution is used, then the battery can operate, but gas is generated during initial charging and storage, causing battery thickness to increase and internal pressure to rise
Solution Approach 1:
The patent applies preliminary action by introducing a vinylene carbonate-based additive that reacts during initial charging to form a stable coating layer on the negative electrode surface before normal operation begins. This pre-formed coating prevents subsequent gas generation and battery swelling during storage and cycling, thus controlling battery thickness while maintaining reliability
Solution Approach 2:
The vinylene carbonate-based additive acts as an intermediary substance that mediates between the electrolytic solution and the negative electrode. It forms a protective coating layer that allows ion transport while preventing direct contact between the electrolyte and electrode, thereby preventing gas generation and battery swelling without compromising battery operation
2Reliability
If a conventional organic electrolytic solution is used, then the battery can be charged, but the passivation layer breaks down at high temperatures, increasing gas generation and reducing safety
Solution Approach 1:
The vinylene carbonate-based additive performs preliminary action by forming a stable, heat-resistant coating layer on the negative electrode during initial charging. This pre-formed protective layer maintains its integrity at high storage temperatures, preventing breakdown of the passivation layer and subsequent gas generation, thus ensuring battery safety
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition and structure of the coating layer through the use of vinylene carbonate-based additive. This creates a coating with enhanced thermal stability and chemical resistance, enabling it to withstand high storage temperatures without decomposition and gas generation
3Reliability
If conventional additives are used, then some decomposition is prevented, but ion mobility is restricted and gas generation is not sufficiently suppressed
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical structure and concentration of the vinylene carbonate-based additive. This creates a coating layer with balanced properties: sufficiently dense to prevent electrolyte decomposition and gas generation, yet sufficiently porous to allow efficient lithium ion transport, thus maintaining both electrolyte stability and ion mobility
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 ensures reliable battery performance by maintaining consistent thickness, improving charge/discharge efficiency, and extending battery lifespan by stabilizing the SEI film and preventing electrolyte decomposition.
Implementation Method 1
reacts with the anode surface to form a stable SEI film, suppressing decomposition and swelling through strong adhesion and chemical bonding
Implementation Method 2
the SEI film acts as an ion tunnel through which only lithium ions pass and solvates lithium ions to prevent cointercalation of an organic solvent
Implementation Method 3
an organic electrolytic solution in which a lithium salt is dissolved in an organic solvent is used in the lithium battery
Data Source
AI summary
An organic electrolytic solution and a lithium battery employing the same are provided. The organic electrolytic solution includes: a lithium salt; an organic solvent containing a high dielectric constant solvent and a low boiling point solvent; and a dicarboxylic acid derivative having at least one substituted silyl group. The organic electrolytic solution and the lithium battery employing the same have improved reductive decomposition stability, thereby decreasing an irreversible capacity after a first cycle and improving the charge/discharge efficiency and lifespan of the battery. The lithium battery has non-varying chemical properties at room temperature and a uniform thickness after standard charging, and thus has high reliability.