Polymer Electrolyte Oligomer Solution for Solid-State Battery Interfaces
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Solution Overview
Problem
The poor interface infiltration between the electrolyte and the electrode in solid-state lithium ion batteries results in decreased ion conductivity and stability, leading to safety hazards and reduced performance.
Innovation Solution
An oligomer solution of a polymer electrolyte comprising monomers with conjugated aromatic groups for π-π conjugation with graphite and carbon layers, and polar groups for chemical bonding, forming a three-dimensional network structure that enhances interface contact and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used to replace organic electrolyte solution, then safety performance is improved, but interface infiltration between electrolyte and electrode deteriorates
Solution Approach 1:
The patent changes the physical state of the electrolyte from solid to oligomeric liquid state, which maintains the safety benefits of solid electrolytes while improving interface infiltration capability. The oligomeric electrolyte with molecular weight of 1000-50000 exhibits both enhanced safety and good wettability on electrode surfaces.
Solution Approach 2:
The patent creates a composite system by combining oligomeric electrolyte with specific monomers (containing heteroatoms like O, N, S) and electrolyte salts, forming a composite material that simultaneously achieves good interface infiltration and high safety performance. The composite structure allows synergistic effects between different components.
2Reliability
If conventional solid electrolyte is used, then safety is improved, but ion conductivity decreases
Solution Approach 1:
The patent optimizes the molecular weight parameter of the oligomeric electrolyte to be within 1000-50000, which balances safety and ion conductivity. This parameter change allows the electrolyte to maintain the safety advantages of solid-state while achieving sufficient ion conductivity for practical applications.
Solution Approach 2:
The patent introduces local heteroatom sites (O, N, S) within the oligomeric structure that create localized regions of high lithium ion affinity. These local quality enhancements provide conductive pathways that improve overall ion conductivity while maintaining the bulk safety characteristics of the solid-state electrolyte.
3Reliability
If SEI film is formed on electrode interface, then electrode protection is achieved, but interface contact area decreases
Solution Approach 1:
The patent employs oligomeric electrolyte with specific functional groups that form a partial SEI film with controlled thickness and composition. The oligomeric structure allows for moderate SEI formation that provides sufficient protection without excessively reducing the effective interface contact area, achieving a balance between protection and contact.
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
Improves ion conductivity, reduces lithium dendrite piercing, and enhances the structural stability and safety of the battery by promoting uniform interface infiltration and dielectric shielding.
Implementation Method 1
the first acrylate monomer contains a conjugated aromatic group... which can generate π-π conjugation with graphite and the carbon layer
Implementation Method 2
the second acrylate monomer contains a polar group... which can react with structural defects... to form chemical bonding, can also generate polar attraction with metal ions
Implementation Method 3
An oligomer solution of a polymer electrolyte comprising monomers... forming a three-dimensional network structure
Data Source
Figure 1~2
Figure 3
AI summary
The present application relates to an oligomer solution of a polymer electrolyte, a polymer electrolyte and an electrochemical device. The oligomer solution of the polymer electrolyte comprises monomers and an electrolyte solution, the monomers form polymer molecular chains through free radical polymerization, and the polymer molecule chain is cross-linked to form a polymer electrolyte with a three-dimensional network structure; the electrolyte solution comprises an organic solvent, which has strong mobility, permeates into pores of electrodes, promotes interface contact between the polymer electrolyte and the electrodes, improves the interface infiltration between the polymer electrolyte and the electrodes, increases the ion conductivity, facilitate lithium ion transmission, and enhances the electrochemical performance of a battery.