Electrolyte Solution High-Voltage Stability Additives
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Solution Overview
Problem
Lithium ion secondary batteries face safety concerns and decreased discharge capacity when exposed to high temperatures or subjected to repeated charging and discharging, and they require improved high-voltage stability for automotive applications.
Innovation Solution
An electrolyte solution containing specific amounts of amines and amides, which enhance the high-temperature storage characteristics of lithium ion secondary batteries by including compounds like those represented by formulas (A) and (B), improving safety and stability under high voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-aqueous electrolyte solution secondary battery uses fluorinated acyclic carbonate to suppress gas generation, then safety is improved, but discharge capacity decreases in high-temperature environment or after repeated charging and discharging
Solution Approach 1:
The patent combines fluorinated acyclic carbonate (which suppresses gas generation and improves safety) with cyclic carbonate and specific additives ( compounds of formulas (A) and (B)). This combination maintains the gas-suppressing effect while the cyclic carbonate and additives preserve discharge capacity during high-temperature storage and repeated cycling, thus resolving the contradiction between safety and duration of action.
Solution Approach 2:
The electrolyte solution uses a composite formulation comprising fluorinated acyclic carbonate, cyclic carbonate, and specific additive compounds (formulas (A) and (B)). This composite material approach allows the system to benefit from the gas-suppressing properties of fluorinated acyclic carbonate while the other components maintain capacity stability under high-temperature and repeated cycling conditions, resolving the contradiction between safety and discharge capacity retention.
2Use of energy by moving object
If lithium ion secondary batteries operate under high voltage to increase capacity, then energy density is improved, but gas generation increases leading to safety issues
Solution Approach 1:
The patent combines fluorinated acyclic carbonate with cyclic carbonate and specific additives (compounds of formulas (A) and (B)) to create an electrolyte system that can operate at high voltages for increased energy density while the fluorinated acyclic carbonate suppresses gas generation, thus maintaining safety during high-voltage operation.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by introducing fluorinated acyclic carbonate and specific additive compounds (formulas (A) and (B)) that stabilize the electrolyte system under high voltage conditions, suppressing gas generation while allowing high-voltage operation for increased energy density.
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 significantly improves the high-temperature storage characteristics and stability of lithium ion secondary batteries, addressing safety and performance issues in high-voltage environments.
Implementation Method 1
When a lithium ion secondary battery is supplied with a voltage, it may generate gas due to electrochemical oxidation or reduction in some cases
Implementation Method 2
In order to improve the safety, charge characteristics, and electric properties of electrochemical devices, such as lithium ion secondary batteries, various methods are proposed
Data Source
AI summary
An electrolyte solution including a solvent, an electrolyte salt, and at least one compound (α) selected from an amine (A) represented by the formula (A):(wherein R1 and R2 may be the same as or different from each other, and individually represent a C1-C7 alkyl group; Rf1 represents a C1-C7 fluorinated alkyl group), and an amide (B) represented by the formula (B):(wherein R3, R4, and R5 may be the same as or different from each other, and individually represent a C1-C7 alkyl group). The amount of the compound (α) is 0.001 to 20 ppm in the electrolyte solution.