Polymer Electrolyte for Lithium Secondary Battery
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Solution Overview
Problem
Current lithium secondary batteries face challenges with oxidation stability and ionic conductivity, particularly when using polyethylene oxide polymer electrolytes, which have limited solubility for lithium salts and are not suitable for high voltage operations.
Innovation Solution
A polymer electrolyte is developed, represented by specific formulas, with a weight average molecular weight of 2,000 g/mol or greater, incorporating a lithium salt and non-ion or ion-conductive inorganic particles, enhancing mechanical properties and ionic conductivity without the need for organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyethylene oxide polymer electrolyte is used, then ease of manufacture is maintained, but solubility for lithium salt deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters by incorporating cyclic carbonate units with specific ring sizes (3-7 membered rings) and adjusting the molar ratio of cyclic carbonate to PEO units. This structural modification enhances lithium salt solubility through improved coordination chemistry while maintaining a relatively simple synthesis process using conventional polymerization methods.
2Reliability
If conventional polymer electrolyte is used, then device complexity is minimized, but suitability for high voltage operations deteriorates
Solution Approach 1:
The patent creates a composite polymer structure where PEO chains are integrated with cyclic carbonate units (Formula 1), combining the mechanical advantages of PEO with the high voltage stability of cyclic carbonate. This composite structure enables high voltage operation (4.0-4.5V) while maintaining a relatively simple single-phase polymer architecture rather than requiring complex multi-layer devices.
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 polymer electrolyte achieves improved ionic conductivity and oxidation stability, enabling the manufacture of lithium secondary batteries with extended lifespan and enhanced safety, suitable for high voltage operations without the limitations of polyethylene oxide-based systems.
Implementation Method 1
the polymer electrolyte has a high ion conductivity
Implementation Method 2
incorporating a lithium salt and non-ion or ion-conductive inorganic particles, enhancing mechanical properties
Implementation Method 3
The polymer electrolyte achieves improved ionic conductivity and oxidation stability, enabling the manufacture of lithium secondary batteries with extended lifespan and enhanced safety, suitable for high voltage operations
Data Source
AI summary
A polymer electrolyte for a lithium secondary battery includes a polymer represented by Formula 1 below,wherein a and b are each independently an integer from 1 to 5, and n is an integer from 1 to 1,000. A lithium secondary battery includes the polymer electrolyte.