Unsaturated Cyclic Ester Carbonate Electrolyte for Silicon Anode Stability
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Solution Overview
Problem
Current secondary batteries face challenges in achieving superior battery characteristics, such as high energy density and long cycle life, especially when using high-reactive metal-based anode materials, due to decomposition reactions during charge and discharge cycles.
Innovation Solution
Incorporating an unsaturated cyclic ester carbonate in the electrolytic solution, specifically represented by Formula (1), which improves the chemical stability and reduces decomposition reactions, thereby enhancing battery performance when used with metal-based anode materials like Si and Sn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-reactive metal-based anode materials (Si, Sn) are used to increase energy density, then battery capacity is improved, but decomposition reactions occur during charge and discharge cycles reducing battery life
Solution Approach 1:
The patent introduces an unsaturated cyclic ester carbonate as an intermediary substance in the electrolytic solution. This additive acts as a mediator between the high-reactive metal-based anode materials and the electrolyte, suppressing decomposition reactions by forming a stable interface layer that prevents direct harmful interactions while allowing ion transport.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolytic solution by incorporating unsaturated cyclic ester carbonate with specific molecular structure characteristics (one or more carbon-carbon unsaturated bonds). This parameter change in the electrolyte composition fundamentally alters the electrochemical stability and suppression of decomposition reactions at the anode interface.
2Ease of manufacture
If conventional electrolytic solution composition is used, then battery manufacturing is simple, but decomposition reactions occur at high voltage charging reducing battery performance
Solution Approach 1:
The patent creates a composite electrolytic solution system by combining conventional electrolyte components with unsaturated cyclic ester carbonate additive. This composite approach integrates the beneficial properties of traditional electrolytes with the stabilizing effects of the unsaturated cyclic ester carbonate, achieving both ease of manufacture and improved high-voltage performance.
3Reliability
If cyclic ester carbonate with carbon-carbon unsaturated bonds is added to suppress decomposition, then battery reliability is improved, but electrolytic solution composition complexity increases
Solution Approach 1:
The patent applies partial action by using a small but effective amount of unsaturated cyclic ester carbonate additive in the electrolytic solution. Rather than completely reformulating the electrolyte system, this approach introduces just enough of the stabilizing component to suppress decomposition reactions and improve cycle retention, minimizing composition complexity while achieving reliability improvements.
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 use of unsaturated cyclic ester carbonate in the electrolytic solution significantly improves battery characteristics by reducing decomposition reactions, leading to higher cycle retention and conservation retention ratios, especially when the anode active material is a high-reactive metal-based material, and maintains performance across various temperature conditions.
Implementation Method 1
improves the chemical stability and reduces decomposition reactions
Implementation Method 2
The electrolytic solution contains a solvent and an electrolyte salt. 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 material including Si, Sn, or both as constituent elements. The electrolytic solution includes an unsaturated cyclic ester carbonate represented by the following Formula (1),where X is a divalent group in which m-number of >C═CR1-R2 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; and m and n satisfy m≥1 and n≥0.