Electrolyte Solution Compound A for Lithium Ion Battery High-Temperature Stability
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Solution Overview
Problem
Lithium ion secondary batteries face safety concerns and decreased discharge capacity when exposed to high temperatures or repeated charging and discharging, and require improved high-voltage stability for automotive applications.
Innovation Solution
An electrolyte solution containing a specific compound represented by formula (A), with R1 and R2 being C1-C7 alkyl groups, is used to enhance the high-temperature storage characteristics of lithium ion secondary batteries, comprising a solvent and electrolyte salt with the compound present in concentrations of 0.001 to 10 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-aqueous electrolyte solution secondary battery is left in high-temperature environment or is repeatedly charged and discharged, then the discharge capacity decreases, but the battery safety and stability are compromised
Solution Approach 1:
The patent introduces a specific compound with formula (A) containing C1-C7 alkyl groups at controlled concentrations (0.001 to 10 ppm) to modify the electrolyte solution's chemical composition. This parameter change in the molecular structure and concentration of additives fundamentally alters the battery's high-temperature storage characteristics, enabling it to maintain discharge capacity while improving thermal stability and safety.
2Quantity of substance
If the battery voltage is increased to increase capacity for automotive use, then the energy density improves, but gas generation increases leading to safety issues
Solution Approach 1:
The compound of formula (A) acts as an intermediary substance in the electrolyte solution that mediates between the high voltage conditions and the battery components. It suppresses direct harmful interactions that lead to gas generation during electrochemical oxidation and reduction, particularly under high voltage conditions, thereby enabling increased battery capacity without compromising safety.
Solution Approach 2:
The patent converts the potentially harmful effect of high voltage (which causes gas generation) into a beneficial outcome by using the compound of formula (A) to suppress electrolysis reactions. This allows the battery to operate at higher voltages for increased capacity while the compound prevents the harmful gas generation that would normally occur under such conditions.
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 of lithium ion secondary batteries, ensuring safer and more stable battery performance, especially under high-voltage conditions.
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
When a lithium ion secondary battery is supplied with a voltage, it may generate gas due to electrochemical oxidation or reduction in some cases
Data Source
AI summary
An electrolyte solution including a solvent and an electrolyte salt. The solvent contains a compound (A) represented by the formula (A) in an amount of 0.001 to 10 ppm in the electrolyte solution:wherein R1 and R2 may be the same as or different from each other, and individually represent a C1-C7 alkyl group.