Electrolytic Solution 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, especially in applications like electric vehicles and power tools, due to limitations in electrolytic solutions that affect charge and discharge reactions.
Innovation Solution
The use of an electrolytic solution comprising an unsaturated cyclic ester carbonate and specific aromatic compounds, dinitrile compounds, sulfinyl compounds, and lithium salts, which enhance chemical stability and prevent decomposition, thereby improving battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solutions are used, then battery capacity is achieved, but battery deterioration occurs during high-voltage charge and pressure increase causes explosion risk
Solution Approach 1:
The patent introduces a cyclic ester carbonate with specific chemical structure (Formula 1) as an intermediary substance in the electrolytic solution. This compound acts as a mediator between the electrode and conventional electrolyte, forming a stable interface layer that prevents direct harmful interactions while allowing ion transport, thus enabling high-voltage charging without compromising safety
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining cyclic ester carbonate (Formula 1) with other electrolyte components in specific ratios. This composite formulation integrates the stabilizing properties of the cyclic ester carbonate with the conductive properties of conventional electrolytes, achieving both high-voltage capability and safety
2Use of energy by moving object
If battery energy density is increased, then power output improves, but battery life decreases due to decomposition during charge and discharge cycles
Solution Approach 1:
The cyclic ester carbonate (Formula 1) performs preliminary protective action by forming a stable surface film on the electrode before decomposition can occur. This pre-formed protective layer prevents subsequent decomposition reactions during charge and discharge cycles, preserving battery materials and extending lifespan while maintaining high energy density
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolytic solution by incorporating cyclic ester carbonate with specific molecular structure (Formula 1). This parameter change in electrolyte composition alters the electrochemical stability window and reaction kinetics, enabling sustained high-energy operation without degradation
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 composition significantly improves battery characteristics by enhancing chemical stability, preventing decomposition, and maintaining performance even after repeated charge and discharge cycles, leading to superior energy density and extended battery life.
Implementation Method 1
A secondary battery includes a cathode, an anode, and an electrolytic solution. The electrolytic solution includes a solvent and an electrolyte salt.
Implementation Method 2
a cyclic ester carbonate that has one or more carbon-carbon unsaturated bonds is used as an additive for an electrolytic solution so as to suppress, for example, battery deterioration in high-voltage charge
Data Source
AI summary
A secondary battery includes: a cathode; an anode; and an electrolytic solution. The electrolytic solution includes an unsaturated cyclic ester carbonate and one or more selected from a group configured of aromatic compounds, dinitrile compounds, sulfinyl compounds, and lithium salts.