Lithium Battery Electrolyte Composition for Low-Resistance Fast Charging
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Solution Overview
Problem
Lithium secondary batteries face decreased power and capacity due to surface damages of nickel-based lithium metal oxide cathode active materials and side reactions with the electrolyte solution, leading to rapid degradation of charge properties.
Innovation Solution
An electrolyte solution for lithium secondary batteries comprising a lithium salt, a linear carbonate-based compound, a linear ester-based compound, and a specific additive, which reduces initial resistance and enhances rapid charging performance by promoting lithium ion and electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nickel-based lithium metal oxide is used as cathode active material to achieve high capacity, then battery capacity is improved, but surface damages and side reactions occur leading to rapid degradation of charge properties
Solution Approach 1:
The patent introduces a coating layer comprising fluorinated cyclic carbonate and fluorinated chain carbonate as an intermediary between the nickel-based cathode and electrolyte. This coating acts as a protective mediator that prevents direct contact and harmful interactions while allowing lithium ion transport, thereby maintaining high capacity benefits while improving charge stability
Solution Approach 2:
The patent modifies the surface chemistry parameters of the cathode by introducing fluorinated compounds with specific molecular structures and ratios. By changing the chemical composition parameters (fluorine content, carbonate ratio) of the coating layer, the electrochemical stability is improved while maintaining ion conductivity
2Ease of manufacture
If conventional electrolyte solution is used to achieve simple composition, then manufacturing ease is improved, but side reactions with cathode material occur degrading performance
Solution Approach 1:
The patent creates a composite electrolyte system by combining conventional carbonate solvents with fluorinated additive compounds. This composite approach maintains the bulk properties of simple carbonate electrolytes while introducing a protective coating function through the fluorinated additives, achieving both ease of manufacture and improved reliability
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 the lithium secondary battery's electrochemical performance, operational reliability, and capacity retention, reducing initial resistance and enhancing rapid charging capabilities.
Implementation Method 1
an electrolyte solution for a lithium secondary battery including a lithium salt, an organic solvent including a linear carbonate-based compound represented by Chemical Formula 1 and a linear ester-based compound represented by Chemical Formula 2
Implementation Method 2
a lithium salt, an organic solvent including a linear carbonate-based compound represented by Chemical Formula 1 and a linear ester-based compound represented by Chemical Formula 2
Data Source
AI summary
According to the present disclosure, an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the electrolyte solution are provided. The electrolyte solution for a lithium secondary battery includes a lithium salt, an organic solvent including a linear carbonate-based compound represented by Chemical Formula 1, a linear ester-based compound represented by Chemical Formula 2, and a compound represented by Chemical Formula 3.