Polymer Electrolyte Oligomer Solution for Electrode Interface Infiltration
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Solution Overview
Problem
The poor interface infiltration between the electrolyte and the electrode in lithium ion batteries results in decreased ion conductivity and electrochemical performance due to the lack of mobility in solid electrolytes, leading to lithium dendrite growth and safety hazards.
Innovation Solution
An oligomer solution of a polymer electrolyte comprising monomers with conjugated aromatic groups and polar groups is used to improve interface infiltration, promoting lithium ion transmission and enhancing electrochemical performance through π-π conjugation and polar interactions, forming a stable polymer electrolyte gel with strong adhesion to the electrode.
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 with electrode deteriorates
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from solid polymer to liquid oligomer solution, which maintains the safety advantages of solid electrolytes while gaining the mobility and infiltration capabilities of liquid electrolytes. The oligomer solution penetrates into the electrode pores effectively, solving the interface infiltration problem.
Solution Approach 2:
The patent uses a composite electrolyte system comprising oligomer solution and solid polymer electrolyte. The oligomer solution provides good interface infiltration and ion conductivity, while the solid polymer electrolyte maintains safety performance. This composite approach combines the advantages of both material types.
2Reliability
If solid electrolyte is used, then safety is improved, but ion conductivity decreases
Solution Approach 1:
The patent changes the electrolyte from solid to liquid oligomer form, which significantly improves ion conductivity while maintaining safety. The liquid state allows for better ion mobility and transmission, directly addressing the low ion conductivity issue of solid electrolytes.
Solution Approach 2:
The oligomer solution acts as an intermediary between solid and liquid electrolytes. It provides the ion conductivity of liquid electrolytes while maintaining the safety characteristics of solid electrolytes, serving as a bridge that combines the beneficial properties of both states.
3Ease of manufacture
If conventional monomer is used, then polymerization is simple, but interface adhesion with electrode deteriorates
Solution Approach 1:
The patent uses a composite monomer system containing both conventional acrylate monomers (for easy polymerization) and functional monomers with aromatic groups and polar groups (for strong interface adhesion). This composite approach maintains polymerization simplicity while significantly improving interface adhesion strength.
Solution Approach 2:
The patent introduces monomers with specific functional groups (aromatic groups for π-π conjugation and polar groups for dipole interactions) that concentrate adhesion-enhancing properties at the electrode interface. This local quality improvement ensures strong adhesion where it is most needed without complicating the overall polymerization process.
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 solution increases ion conductivity, reduces lithium dendrite piercing, and improves the structural stability and safety of the battery by enhancing interface contact and adhesion, thereby improving charge and discharge cycle stability.
Implementation Method 1
the first acrylate monomer contains a conjugated aromatic group with a multi-membered ring structure, which can generate 71-71 conjugation with graphite and the carbon layer
Implementation Method 2
the second acrylic ester monomer contains a polar group which has a large molecular dipole moment and strong polarity; the polar group can react with structural defects (hydroxyl, amino, or carboxyl, etc.) in the carbon layer of the anode material to form chemical bonding, can also generate polar attraction with metal ions in a cathode material
Implementation Method 3
the electrolyte solution has strong mobility and can penetrate into the pores of the electrode
Data Source
AI summary
An oligomer solution of a polymer electrolyte, a polymer electrolyte, and an electrochemical device are provided. 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.