Secondary Battery Electrolyte with Unsaturated Cyclic Ester Carbonate
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Solution Overview
Problem
Current secondary batteries face challenges in achieving superior battery characteristics, such as high energy density and long life, while minimizing degradation and explosion hazards, particularly during high-voltage charging.
Innovation Solution
A secondary battery design incorporating a carbon material anode with styrene-butadiene rubber and an electrolytic solution containing an unsaturated cyclic ester carbonate, which enhances chemical stability and suppresses decomposition reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic ester carbonate with carbon-carbon unsaturated bonds is used as an electrolytic solution additive to suppress battery degradation and explosion hazards, then reliability improves, but the complexity of electrolytic solution composition increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of cyclic ester carbonate additives in the electrolytic solution. Specifically, it limits the additive content to 0.01-10 wt% of the total electrolytic solution and controls the ratio between saturated and unsaturated cyclic ester carbonates, thereby optimizing both safety and complexity parameters.
Solution Approach 2:
The patent uses composite materials by combining multiple cyclic ester carbonate components (saturated and unsaturated types) with specific solvents and electrolyte salts. This composite approach allows the electrolytic solution to achieve both improved reliability through degradation suppression and controlled complexity through defined compositional ratios.
2Productivity
If high-voltage charging is performed to increase power output, then productivity improves, but battery degradation and explosion risk increase
Solution Approach 1:
The patent introduces cyclic ester carbonate additives as intermediary substances in the electrolytic solution. These additives form protective films on electrode surfaces during high-voltage charging, acting as mediators that enable high power output while simultaneously preventing direct harmful interactions between the electrolyte and electrodes, thus suppressing degradation and explosion risks.
Solution Approach 2:
The patent optimizes the chemical composition parameters of the electrolytic solution by incorporating specific ratios of saturated and unsaturated cyclic ester carbonates. This parameter optimization allows the system to withstand high-voltage charging conditions (improving productivity) while maintaining structural integrity and safety (preserving 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 battery exhibits improved cycle retention and conservation characteristics, with increased discharge capacity and reduced degradation, even under high-temperature conditions.
Implementation Method 1
an electrolytic solution containing an unsaturated cyclic ester carbonate, which enhances chemical stability and suppresses decomposition reactions
Implementation Method 2
The electrolytic solution functioning as a medium for a charge and discharge reaction
Data Source
AI summary
A secondary battery includes: a cathode; an anode; and an electrolytic solution. The anode includes a carbon material and styrene-butadiene rubber. The electrolytic solution includes an unsaturated cyclic ester carbonate represented by the following Formula (1).(X is a divalent group in which m-number of >C═CR1R2 and n-number of >CR3R4 are bonded in any order. Each of R1 to R4 is one of a hydrogen group, a halogen group, a monovalent hydrocarbon group, a monovalent halogenated hydrocarbon group, a monovalent oxygen-containing hydrocarbon group, and a monovalent halogenated oxygen-containing hydrocarbon group. Any two or more of the R1 to the R4 are allowed to be bonded to one another. m and n satisfy m≥1 and n≥0.)