Cyclic Siloxane Crosslinker for Polymer Electrolyte Conductivity
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Solution Overview
Problem
Existing solid polymer electrolytes face challenges in achieving optimal mechanical properties and ion conductivity, particularly at room temperature, due to poor compatibility and control over crosslinking, which affects their suitability for lithium-polymer batteries.
Innovation Solution
A cyclic siloxane-based compound with polyalkylene oxide acrylate groups is introduced as a crosslinking agent, enhancing compatibility with other electrolyte components and allowing for controlled mechanical and electrochemical properties, improving ion conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If polysiloxane-based polymer electrolytes are used to improve flexibility and molecular chain movement, then mechanical flexibility is improved, but ion conductivity deteriorates to very low levels (10^-4 S/cm)
Solution Approach 1:
The patent uses a composite structure combining polyalkylene oxide chains (for ion conductivity) with cyclic siloxane crosslinking agents (for mechanical flexibility). This creates a gel-type polymer electrolyte that integrates the advantages of both material systems, achieving high ion conductivity while maintaining excellent mechanical flexibility and elasticity.
2Reliability
If plasticizer content is increased to improve ion conductivity, then ion conductivity is improved, but mechanical properties deteriorate significantly
Solution Approach 1:
The patent changes the chemical structure parameters of the crosslinking agent by introducing polyalkylene oxide groups with specific chain lengths (n=1-20) into the cyclic siloxane structure. This allows precise control over the balance between mechanical strength and ion conductivity by adjusting the polyalkylene oxide chain length and crosslinking density, rather than relying on plasticizer content.
3Strength
If crosslinking degree is increased to improve mechanical strength, then mechanical strength is improved, but ion conductivity deteriorates
Solution Approach 1:
The patent introduces polyalkylene oxide groups at specific locations (side chains) of the cyclic siloxane crosslinking agent structure. This creates local regions of high ion conductivity within the crosslinked network, allowing the bulk material to maintain mechanical strength while specific regions facilitate ion transport.
4Manufacturing precision
If acryl group content is increased to control crosslinking degree, then crosslinking control is improved, but mechanical properties cannot be controlled as required because content depends on molecular weight
Solution Approach 1:
The patent segments the crosslinking agent structure into distinct functional components: the cyclic siloxane core (for crosslinking) and the polyalkylene oxide side chains (for ion conductivity and mechanical flexibility). This segmentation allows independent optimization of each function and precise control over crosslinking degree and mechanical properties.
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 cyclic siloxane-based compound significantly improves the mechanical strength and ion conductivity of polymer electrolytes, enabling their use in high-capacity lithium-polymer secondary batteries and electrolyte films with enhanced electrochemical stability.
Implementation Method 1
a crosslinked polymer electrolyte was prepared by curing a composition containing polyalkylene glycol compound having a chemically crosslinkable group, an ion-conductive liquid and an electrolyte salt through UV radiation or electron beam radiation
Implementation Method 2
a cyclic siloxane-based compound having a novel structure in which polyalkylene oxide acrylate groups are introduced into a cyclic siloxane compound
Data Source
AI summary
The present invention relates to a cyclic siloxane-based compound and a solid polymer electrolyte composition containing the same as a crosslinking agent. The cyclic siloxane-based compound having a novel structure in which polyalkylene oxide acrylate groups are introduced into a cyclic siloxane compound and a solid polymer electrolyte composition containing the cyclic siloxane-based compound as a crosslinking agent along with other electrolyte components such as a plasticizer, lithium salt and a curing initiator. Since the solid polymer electrolyte composition of the present invention improves ion conductivity and electrochemical stability at room temperature, it can be useful as polymer electrolyte for electrolyte films, small-sized to high-capacity lithium-polymer secondary batteries, etc. Also, physical properties of the polymer electrolyte can be controlled easily by controlling the length of the polyalkylene oxide group in the cyclic siloxane-based crosslinking agent.