Electrolyte Solution for Lithium-Ion Battery Initial Resistance
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Solution Overview
Problem
Conventional electrolyte solutions for electrochemical devices, such as lithium-ion secondary batteries, require further improvement in initial resistance and storage characteristics to meet the demands of advanced applications, particularly in automotive use.
Innovation Solution
An electrolyte solution containing a dilithium phosphoric acid ester with a specific structure, along with a solvent and an electrolyte salt, is developed to enhance the initial resistance and storage characteristics of electrochemical devices. The solution includes a compound represented by the formula (1) and another compound represented by formula (2), with specific alkyl groups and ether bonds, and hydrogen fluoride, optimizing their concentrations and mass ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then basic battery function is maintained, but initial resistance and storage characteristics are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of hydrogen fluoride (5-200 ppm) and the mass ratios of specific phosphoric acid esters (0.01-5% and 0.1-10%) in the electrolyte solution. This optimization of chemical parameters achieves both low initial resistance and improved storage characteristics, resolving the technical contradiction between these two performance metrics.
Solution Approach 2:
The patent uses composite materials by combining multiple phosphoric acid esters with different structures (formula 1 and formula 2) along with hydrogen fluoride in the electrolyte solution. This composite approach creates synergistic effects that simultaneously improve initial resistance and storage characteristics, which cannot be achieved with single additives alone.
2Reliability
If electrolyte solution composition is optimized for initial resistance, then low-temperature performance improves, but storage characteristics may deteriorate
Solution Approach 1:
The patent employs parameter changes by establishing specific concentration ranges for hydrogen fluoride (5-200 ppm) and defined mass ratio ranges for the phosphoric acid esters. This precise parameter optimization ensures that the electrolyte composition achieves both low initial resistance and stable storage characteristics, preventing the trade-off between these properties.
Solution Approach 2:
The patent uses hydrogen fluoride as an intermediary substance that mediates between the phosphoric acid esters and the battery components. This intermediary plays a crucial role in forming stable interfacial films that simultaneously reduce resistance and improve storage stability, resolving the contradiction between initial performance and long-term stability.
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 initial resistance and storage characteristics of electrochemical devices, ensuring better performance and stability, especially in high-temperature and high-voltage applications.
Implementation Method 1
an electrolyte solution containing a solvent and a compound (1) represented by the following formula (1)... The electrolyte solution of the invention can give improved initial resistance and storage characteristics to an electrochemical device
Data Source
AI summary
An electrolyte solution containing a solvent and a compound represented by the following formula (1), wherein R1 is a C1-C5 linear or branched non-fluorinated alkyl group optionally containing an ether bond. Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the electrochemical device or lithium ion secondary battery.