Lithium Battery Ionomer for High Voltage Stability
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining high temperature and high voltage stability due to electrolyte salt decomposition, leading to corrosion, transition metal elution, and concentration polarization, which reduces cycle life and power efficiency.
Innovation Solution
Incorporating an ionomer with a fluoroalkyl sulfonate substituent in the cathode, anode, or separator of lithium secondary batteries, which acts as a single ion conductor and lithium source, reducing the amount of electrolyte salt and preventing anion-induced side reactions, thereby enhancing ionic conductivity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyte salt is used in high temperature and high voltage environment, then ionic conductivity is maintained, but decomposition occurs leading to corrosion and transition metal elution
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing fluorinated cyclic carbonate components with specific molecular structures (where a, b, c, d are integers satisfying 1≤a≤4, 1≤b≤4, 1≤c≤4, 1≤d≤4, and a+b+c+d=4-16). This compositional parameter change enables the electrolyte to maintain stability at high temperatures and voltages while preventing decomposition and metal elution.
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorinated cyclic carbonate components with specific gravity between 1.8 and 2.2 with other electrolyte solvents. This composite material approach leverages the high dielectric constant and thermal stability of the fluorinated component while maintaining overall ionic conductivity, thereby achieving reliability in extreme conditions without the harmful decomposition effects of conventional electrolytes.
2Productivity
If conventional electrolyte is used, then battery operation is maintained, but concentration polarization occurs reducing power efficiency
Solution Approach 1:
The patent modifies the electrolyte's physical and chemical parameters by incorporating fluorinated cyclic carbonate components with specific gravity 1.8-2.2, which have high dielectric constants and unique ionic transport properties. These parameter changes reduce concentration polarization by improving ion distribution and reducing resistance, thereby enhancing power efficiency and reducing energy loss during battery operation.
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 ionomer improves ionic conductivity, prevents transition metal elution, and increases cycle life and power efficiency by reducing concentration polarization, ensuring stability in high temperature and high voltage environments.
Implementation Method 1
an ionomer having a fluoroalkyl sulfonate substituent... secure high ionic conductivity
Implementation Method 2
preventing the elution of a transition metal in even high temperature or a high voltage environment
Implementation Method 3
obtaining high power effects through solving the concentration polarization of the secondary battery
Data Source
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AI summary
The present invention relates to a lithium secondary battery including a cathode, an anode, a separator disposed between the cathode and the anode, and a non-aqueous electrolyte. An ionomer is included in at least one element selected from the group consisting of the cathode, the anode, the separator, and the non-aqueous electrolyte.