High-Voltage Secondary Battery Electrolyte for Cyclability
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Solution Overview
Problem
Existing secondary batteries do not achieve sufficient battery characteristics, such as cyclability and load characteristics, despite various configurations and electrolyte solutions used.
Innovation Solution
A secondary battery configuration with a positive electrode potential versus a lithium reference electrode set to be higher than or equal to 4.50 V, and an electrolytic solution containing a branched carboxylic acid ester compound represented by Formula (1), which includes specific alkyl and halogenated alkyl groups, is used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the positive electrode potential is set to be higher than or equal to 4.50 V, then the energy density and charging capacity are improved, but the decomposition reaction of the electrolytic solution increases
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by introducing a specific branched carboxylic acid ester compound with defined molecular structure (Formula 1) and concentration range (5-30 wt%). This parameter change enables the electrolyte to remain stable at high positive electrode potentials of 4.50 V or higher, resolving the contradiction between achieving high energy density through high voltage charging and maintaining electrolytic solution stability.
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining the branched carboxylic acid ester compound (Formula 1) with other electrolyte components including cyclic carbonates, chain carbonates, and lithium salts. This composite material approach synergistically enhances both the high-voltage stability and the energy storage capability, allowing the battery to operate reliably at potentials ≥4.50 V while maintaining superior energy density.
2Reliability
If conventional electrolytic solutions are used, then the battery structure is simple, but the cyclability and load characteristics are insufficient
Solution Approach 1:
The patent optimizes the compositional parameters of the electrolytic solution by specifying precise concentration ranges for each component: the branched carboxylic acid ester compound (5-30 wt%), cyclic carbonates (65-85 wt%), chain carbonates (5-30 wt%), and lithium salt concentration (0.5-2.0 mol/L). These parameter optimizations simultaneously improve cyclability and load characteristics without requiring complex structural modifications to the battery design.
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
This configuration effectively suppresses the decomposition reaction of the electrolytic solution, even at high charge voltages, thereby maintaining a superior battery characteristic and reducing discharge capacity reduction.
Implementation Method 1
an electrolytic solution includes a branched carboxylic acid ester compound represented by Formula (1)... effectively suppresses the decomposition reaction of the electrolytic solution, even at high charge voltages
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. A potential of the positive electrode, versus a lithium reference electrode, at a time of charging is higher than or equal to 4.50 V. The electrolytic solution includes a branched carboxylic acid ester compound.