Composite Electrolyte Structure for Leak-Resistant Li-Ion Conduction
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Solution Overview
Problem
Existing lithium secondary batteries face challenges with liquid electrolyte leakage, insufficient mechanical properties, and suboptimal ionic conductivity in composite electrolytes.
Innovation Solution
A composite electrolyte comprising a liquid electrolyte, a crosslinked polymer of monomers with curable functional groups, and oxide-based solid electrolyte particles with a particle size of more than 300 nm, which are dispersed in the crosslinked polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid state electrolyte is used in lithium secondary batteries, then ionic conductivity is improved, but liquid leakage occurs during charging/discharging or usage processes
Solution Approach 1:
The patent uses a composite electrolyte consisting of a polymer matrix combined with liquid electrolyte components. The polymer provides structural integrity and prevents leakage, while the liquid electrolyte components maintain high ionic conductivity. This composite approach resolves the contradiction by integrating the advantages of both material types.
Solution Approach 2:
The patent modifies the physical state parameters of the electrolyte by incorporating a polymer matrix that constrains the liquid electrolyte components. This parameter change transforms the electrolyte from a purely liquid state to a gel-like composite state, preventing leakage while preserving ionic conductivity through the liquid components.
2Object-generated harmful factors
If polymer solid electrolytes are used to improve safety, then liquid leakage is prevented, but ionic conductivity is lower than liquid state electrolyte
Solution Approach 1:
The patent creates a composite electrolyte that combines polymer solid electrolyte components with liquid electrolyte components. The polymer provides the solid structure for safety and leakage prevention, while the incorporated liquid electrolyte components restore high ionic conductivity, thus resolving the contradiction between safety and performance.
3Strength
If existing composite electrolytes are used, then some mechanical properties are improved, but mechanical properties are still insufficient and separation membrane is needed
Solution Approach 1:
The patent develops a composite electrolyte that performs multiple functions simultaneously: it provides mechanical support, prevents leakage, and enables ion transport without requiring a separate division membrane. This multi-functional design resolves the contradiction by making the electrolyte itself sufficient for all required functions.
Solution Approach 2:
The patent merges the functions of the electrolyte and the division membrane into a single composite electrolyte structure. By combining the mechanical support function and the ion transport function in one integrated component, the need for a separate membrane is eliminated, reducing device complexity.
4Strength
If existing composite electrolytes are used, then some structural support is provided, but ionic conductivity is not sufficient
Solution Approach 1:
The patent employs a composite electrolyte formulation that integrates polymer components providing structural support with liquid electrolyte components ensuring high ionic conductivity. This composite structure resolves the contradiction by allowing both structural integrity and efficient ion transport to coexist in the same material system.
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 composite electrolyte exhibits improved mechanical properties, preventing liquid leakage, and enhanced ionic conductivity, leading to better electrical characteristics and safety in lithium secondary batteries.
Implementation Method 1
a crosslinked polymer of monomers having a curable functional group
Implementation Method 2
oxide-based solid electrolyte particles dispersed on the crosslinked polymer
Implementation Method 3
a crosslinked polymer of monomers having a curable functional group
Data Source
AI summary
A composite electrolyte exhibits improved mechanical properties and ionic conductivity while preventing a liquid leakage, its preparation method and a secondary battery comprising the same. The composite electrolyte may include a liquid electrolyte; a crosslinked polymer of monomers having a curable functional group; and oxide-based solid electrolyte particles dispersed on the crosslinked polymer and having a particle size of more than 300 nm.