Niobium-Coated Active Material Spray Drying Without Nozzle Clogging
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Solution Overview
Problem
The existing methods for producing coated active materials, such as those used in batteries, face challenges with long production times and nozzle clogging due to high sulfur impurity content in the active materials, which reduces productivity.
Innovation Solution
A method involving transforming a slurry containing an active material and a niobium-based coating solution into droplets, drying them in a heated gas stream, and baking the precursor to produce a coated active material with a niobium coating, where the active material has a sulfur content less than 0.68 wt%, thereby reducing impurity reactions and nozzle clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a slurry containing active material and coating solution is transformed into droplets and dried in a heated gas stream (spray drying method), then production time is reduced and productivity is improved, but nozzle clogging occurs due to sulfur impurity reactions
Solution Approach 1:
The active material is pre-treated to reduce sulfur impurity content to 0.68 wt% or less before preparing the slurry. This preliminary purification prevents subsequent nozzle clogging during the spray drying process, allowing continuous high-speed production without interruption.
Solution Approach 2:
The sulfur content parameter of the active material is changed from high (causing clogging) to low (0.68 wt% or less, preventing clogging). This parameter modification enables the spray drying method to proceed without nozzle blockage, maintaining high productivity.
2Speed
If active material with high sulfur impurity content is used in spray drying, then production speed is maintained, but precipitation and nozzle clogging occur reducing productivity
Solution Approach 1:
The sulfur content parameter is changed to 0.68 wt% or less, which eliminates precipitation and nozzle clogging. This allows the spray drying process to maintain high production speed without interruptions, thereby improving overall productivity.
3Quantity of substance
If sulfur impurity content in active material is high, then material availability is improved, but impurity reactions cause nozzle clogging and reduce productivity
Solution Approach 1:
Sulfur impurity removal is performed as a preliminary step before slurry preparation. This ensures that even though material availability might be affected by purification requirements, the subsequent spray drying process proceeds without clogging, maintaining high productivity.
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
This approach enables the production of coated active materials with high productivity by minimizing nozzle clogging and precipitation, allowing for faster production times and improved efficiency.
Implementation Method 1
drying the slurry droplets in a heated gas stream to obtain a precursor
Implementation Method 2
baking the precursor
Data Source
Figure 1
Figure 2A~3C
Figure 4A~4C
AI summary
In a method for producing a coated active material, a coating layer containing niobium is formed on at least a part of a surface of an active material. The method includes: transforming a slurry containing the active material and a coating solution (11b, 21b, 31b) containing niobium into droplets to obtain slurry droplets (11, 21, 31); drying the slurry droplets (11, 21, 31) in a heated gas stream to obtain a precursor; and baking the precursor. The active material that is used to obtain the slurry droplets (11, 21, 31) contains less than 0.68 wt% of sulfur as an impurity.