POM-Coated Metal Anodes for Dendrite and Side-Reaction Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current secondary battery manufacturing processes face challenges in suppressing side reactions, dendrite formation, increasing costs, and prolonging manufacturing time, which hinder efficient mass production and long-term battery stability.
Innovation Solution
A method for manufacturing a negative electrode involving a metal electrode coated with a composite layer containing polyoxometalate (POM) dispersed in a polymer matrix, using an ion conductive polymer and deionized water to control the solvent ratio and POM concentration, thereby reducing surface roughness and transfer resistance, and minimizing side reactions during charging/discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating methods are used, then manufacturing process is simple, but side reactions occur and dendrite forms during charging/discharging
Solution Approach 1:
The patent applies composite materials by combining polyoxometalate (POM) with a polymer matrix to form a composite coating layer. This composite structure provides both the protective functions (suppressing side reactions and dendrite) and maintains processability. The POM particles are dispersed within the polymer matrix, creating a material that exhibits properties superior to its individual components.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the concentration of POM (30-200 wt%), the glass transition temperature of the polymer matrix (20-100°C), and the coating thickness (1-10 μm). These parameter optimizations enable the coating to achieve the desired protective effects while maintaining ease of manufacture through dip-coating or spray-coating methods.
2Productivity
If conventional electrode coatings are used, then manufacturing cost is low, but manufacturing time is prolonged
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the polyoxometalate particles and preparing the polymer matrix before combining them into the composite coating. This pre-preparation allows for optimized formulation and reduces the complexity and time of the actual coating application process, enabling faster production cycles.
Solution Approach 2:
The polymer matrix serves as an intermediary that facilitates the uniform dispersion and stable attachment of POM particles to the electrode substrate. This intermediary role simplifies the coating process and enables the use of straightforward application methods like dip-coating or spray-coating, improving manufacturing efficiency.
3Reliability
If POM concentration is increased, then side reaction suppression improves, but surface roughness increases
Solution Approach 1:
The patent applies parameter changes by optimizing the POM concentration to a specific range (30-200 wt%) and controlling the polymer matrix glass transition temperature (20-100°C). These parameter optimizations balance the competing requirements: sufficient POM concentration to suppress side reactions while maintaining low surface roughness for good electrochemical performance.
Solution Approach 2:
The patent applies local quality by ensuring uniform dispersion of POM particles throughout the polymer matrix, creating consistent protective properties across the entire coating surface. This uniform distribution prevents localized aggregation that would increase surface roughness while maintaining effective side reaction suppression throughout the coating.
4Reliability
If coating thickness is increased, then protection against dendrite improves, but transfer resistance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the coating thickness to a specific range (1-10 μm). This optimized thickness provides sufficient protection against dendrite formation while maintaining low transfer resistance for efficient ion transport. The thin yet effective coating achieves the balance between protection and conductivity.
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 method effectively suppresses side reactions and dendrite growth, enhances electrical characteristics, and facilitates uniform plating and stripping of metal ions, leading to improved long-term stability and reduced manufacturing costs, enabling more efficient mass production of secondary batteries.
Implementation Method 1
a composite coating layer including a polymer matrix and polyoxometalate (POM) dispersed in the polymer matrix
Implementation Method 2
The solvent may include an ion conductive polymer and deionized water, and a volume ratio of the ion conductive polymer and the deionized water may be greater than 1.5:1 and less than 9:1
Implementation Method 3
The solvent may include an ion conductive polymer and deionized water
Implementation Method 4
uniform plating and stripping of metal ions, leading to improved long-term stability
Data Source
AI summary
According to the present invention, a method for manufacturing a negative electrode includes: preparing a metal electrode, polyoxometalate (POM), and a solvent; preparing a composite coating layer source solution by mixing the POM and the solvent; and preparing a composite coating layer by providing and drying the composite coating layer source solution on the metal electrode.