Lithium Battery Electrolyte EC DMC Ratio for High Voltage Stability
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Solution Overview
Problem
Lithium batteries face challenges in achieving high capacity and long cycle life, especially when charged to high voltages, leading to rapid capacity decline due to negative electrode deterioration.
Innovation Solution
A lithium battery design incorporating a nickel (Ni)-cobalt (Co)-manganese (Mn)-based active material and an electrolytic solution with a nonaqueous organic solvent composition of ethylene carbonate (EC) and dimethyl carbonate (DMC), where EC is ≤20 parts by volume and DMC is ≥60 parts by volume, enhancing Li ion migration and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high charging voltage is used to achieve high capacity, then battery capacity is improved, but negative electrode deterioration accelerates and cycle life decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by specifying precise volume ratios of EC (10-20 vol%), DMC (60-90 vol%), and other carbonates, creating an optimized electrolyte formulation that enables high voltage operation while protecting the negative electrode from deterioration
Solution Approach 2:
The patent uses a composite electrolyte system combining multiple carbonate solvents (EC, DMC, EMC, DEC) with lithium salts, where each component contributes specific properties that collectively enable both high capacity and long cycle life at high charging voltages
2Quantity of substance
If high charging voltage is used to achieve high capacity, then battery capacity is improved, but capacity retention deteriorates
Solution Approach 1:
The patent optimizes the electrolyte composition parameters with specific volume ratios of carbonates (EC ≤20%, DMC ≥60%) to create a stable electrochemical environment that maintains capacity retention even at high charging voltages of 4.25V or higher
3Ease of manufacture
If conventional electrolyte composition is used, then manufacturing is simple, but battery stability at high temperatures deteriorates
Solution Approach 1:
The patent specifies precise compositional parameters for the electrolyte including volume ratios of multiple carbonates and lithium salt concentrations (0.5-2.0M), which when implemented provide both high temperature stability and straightforward manufacturing processes
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 configuration improves capacity retention and delays capacity decline, even at high charge voltages, resulting in a lithium battery with high capacity and extended lifespan.
Implementation Method 1
an electrolytic solution including a nonaqueous organic solvent and a lithium salt
Implementation Method 2
a lithium battery converts chemical energy generated by electrochemical redox reaction of chemical substances into electrical energy
Data Source
AI summary
An electrolytic solution for a lithium battery including a positive electrode having a nickel-cobalt-manganese based active material, the electrolytic solution including a nonaqueous organic solvent and a lithium salt, the nonaqueous organic solvent including ethylene carbonate and dimethyl carbonate, a lithium battery including the electrolytic solution, and a method of operating the lithium battery.