Lithium-Ion Battery Electrolyte Ratio for Low Resistance and Cycle Life
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Solution Overview
Problem
Existing electrolyte solutions for electrochemical devices, such as lithium-ion secondary batteries, face challenges in achieving low internal resistance, excellent cycle characteristics, and minimizing gas generation.
Innovation Solution
The development of an electrolyte solution containing lithium ethyl sulfate and ethyl sulfate, with lithium ethyl sulfate present in a specific range of 0.1-2.0 mass% and a mass ratio of lithium ethyl sulfate to ethyl sulfate ranging from 80-1500, along with optional additives like ethanol and lithium salts (LiPF6, LiN(FSO2)2, LiBF4).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then the electrochemical device can operate, but the internal resistance is high and cycle characteristics are poor
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration of lithium ethyl sulfate (0.1-2.0 mass%) and the mass ratio of lithium ethyl sulfate to ethyl sulfate (80-1500). This specific compositional parameter adjustment reduces internal resistance and improves cycle characteristics without compromising other battery performance aspects.
Solution Approach 2:
The patent uses a composite electrolyte system combining lithium ethyl sulfate and ethyl sulfate together in specific proportions. This composite approach creates synergistic effects where the combination of the two compounds provides both low internal resistance and excellent cycle stability, which neither compound achieves alone at optimal levels.
2Reliability
If conventional electrolyte solutions are used, then the electrochemical device can operate, but gas generation occurs
Solution Approach 1:
The patent reduces gas generation by optimizing the concentration parameters of lithium ethyl sulfate (0.1-2.0 mass%) and ethyl sulfate. This parameter control prevents excessive decomposition reactions that lead to gas formation while maintaining stable operational characteristics of the electrochemical device.
3Object-affected harmful factors
If lithium ethyl sulfate concentration is increased to reduce internal resistance, then electrical conductivity improves, but cost and complexity increase
Solution Approach 1:
The patent identifies and applies optimal parameter ranges: lithium ethyl sulfate at 0.1-2.0 mass% and mass ratio of lithium ethyl sulfate to ethyl sulfate at 80-1500. These parameter specifications achieve low internal resistance while avoiding excessive complexity in electrolyte formulation and manufacturing.
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 electrolyte solution effectively reduces internal resistance, enhances cycle characteristics, and minimizes gas generation in electrochemical devices, particularly lithium-ion secondary batteries.
Implementation Method 1
an electrolyte solution containing lithium ethyl sulfate and ethyl sulfate, the lithium ethyl sulfate being present in an amount of 0.1-2.0 mass% relative to the electrolyte solution
Data Source
AI summary
The invention provides an electrolyte solution capable of providing an electrochemical device that has a low internal resistance and excellent cycle characteristics and that is less likely to generate gas. The electrolyte solution contains lithium ethyl sulfate and ethyl sulfate. The lithium ethyl sulfate is present in an amount of 0.1 to 2.0% by mass relative to the electrolyte solution. The lithium ethyl sulfate and the ethyl sulfate give a mass ratio of the lithium ethyl sulfate to the ethyl sulfate of 80 to 1500.