Secondary Battery Electrolyte Composition for Gas and Swelling Control
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Solution Overview
Problem
Conventional lithium secondary batteries face challenges in improving low-temperature output characteristics, high-temperature storage stability, and reducing gas generation and thickness increase rates due to poor electrolyte solution additives, which lead to degraded cycle characteristics and shortened battery lifespan.
Innovation Solution
An electrolyte solution comprising an organic solvent, a lithium salt, a first additive with specific structural features, and a second additive with electronegative atoms and double bonds, which forms a stable film on the cathode, reducing discharge resistance and suppressing decomposition, thereby enhancing battery performance and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electrolyte solution additives are used, then battery output characteristics are improved, but gas generation and thickness increase rate increase
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte solution by introducing a specific additive (Formula 1) with controlled concentration (0.1-5 wt%), which modifies the electrochemical reactions to reduce gas generation while maintaining output characteristics
Solution Approach 2:
The patent converts the harmful effect of electrolyte decomposition into a beneficial protective film formation on the cathode surface, which prevents further decomposition and reduces gas generation while improving battery performance
2Power
If electrolyte solution additive is added to improve low-temperature output characteristics, then output characteristics are improved, but cycle characteristics and storage stability degrade
Solution Approach 1:
The patent introduces a mediator substance (Formula 1 additive) that facilitates lithium ion transport at low temperatures without causing harmful side reactions, acting as an intermediary between the electrolyte and cathode to improve output while maintaining stability
Solution Approach 2:
The patent creates a localized protective film with specific chemical properties on the cathode surface that provides different functionality: enhancing low-temperature ion transport while simultaneously protecting against degradation during cycling and storage
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, high-temperature storage capacity, and lifespan by reducing discharge resistance, gas generation, and thickness increase, while maintaining stability and cycle characteristics.
Implementation Method 1
the second additive consists of 3 to 5 atoms, has 2 to 4 atoms having an electronegativity of 3 or more, has at least one double bond, and includes a compound having an atomic group represented by Formula 2 below... forms a stable film on the cathode
Implementation Method 2
an electrolyte solution between a cathode and an anode enables smooth movement of lithium ions
Implementation Method 3
electricity is generated or used by oxidation-reduction reaction according to intercalation and desorption at the cathode and the anode
Data Source
AI summary
The present invention relates to an electrolyte solution 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 by suppressing gas generation and increase in thickness.