Aluminum Hydroxide Nanowire Separator Coating via Nanocellulose Template
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Solution Overview
Problem
Existing methods for preparing aluminum hydroxide nanofibers are limited by long reaction times, complex processes, low efficiency, high production costs, and difficulties in industrialization, which affect the practical application of these nanomaterials in battery separators.
Innovation Solution
A method using nanocellulose as a template to prepare aluminum hydroxide nanowires through a simple and efficient process, involving the dispersion of nanocellulose in water, addition of an aluminum salt solution, and gradual addition of an alkaline solution for reactive precipitation, followed by washing and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If sol-gel method combined with supercritical drying is used to prepare aluminum hydroxide nanofibers, then nanofiber morphology can be obtained, but the preparation process becomes complex with long reaction time and high cost
Solution Approach 1:
The patent uses nanocellulose as a template (intermediary) to guide the formation of aluminum hydroxide nanofibers. The nanocellulose provides a pre-formed nanofiber structure that templates the aluminum hydroxide deposition, eliminating the need for complex sol-gel processes while maintaining the desired nanofiber morphology. This intermediary approach simplifies the overall preparation process significantly.
2Shape
If planar stacking of aluminum oxide nanoparticles is used to construct porous ceramic coating, then coating can be formed, but coating thickness and density increase
Solution Approach 1:
The patent employs nanocellulose aerogel as a porous three-dimensional network framework. This porous structure allows the coating to maintain its integrity and protective function while having lower density and thinner thickness compared to planar stacking methods. The porous network provides sufficient mechanical support with minimal material consumption.
3Stability of the object's composition
If inorganic ceramic particles are applied onto organic separator, then thermal stability is improved, but compatibility between materials is poor causing particle detachment
Solution Approach 1:
The patent creates a composite structure where aluminum hydroxide nanowires are grown directly on the nanocellulose aerogel framework. This forms an integrated composite material system where the organic nanocellulose and inorganic aluminum hydroxide are structurally combined at the nanoscale, ensuring strong interfacial bonding and preventing particle detachment while maintaining thermal stability.
4Quantity of substance
If conventional methods are used to prepare aluminum hydroxide nanofibers, then nanomaterial can be obtained, but production efficiency is low and cost is high
Solution Approach 1:
The patent performs preliminary action by first preparing the nanocellulose aerogel framework before aluminum hydroxide deposition. This pre-formed template provides a ready-made nanofiber structure that guides the subsequent aluminum hydroxide formation, eliminating the need for lengthy sol-gel reactions and supercritical drying processes. The preliminary template preparation enables faster and more efficient production.
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 allows for the production of aluminum hydroxide nanowires with a controllable length-to-diameter ratio and uniform diameter, resulting in a battery separator coating with improved thermal stability, reduced thermal shrinkage, and enhanced liquid absorption capacity.
Implementation Method 1
a method for preparing aluminum hydroxide nanowires by template process... Nanocellulose is used as a template to prepare the aluminum hydroxide nanowires
Implementation Method 2
adding slowly an alkaline solution thereto with stirring, and subjecting a resulting mixture to reactive precipitation
Implementation Method 3
adding an aluminum salt solution into the solution obtained in step (1) and mixing evenly; adding slowly an alkaline solution thereto with stirring, and subjecting a resulting mixture to reactive precipitation
Implementation Method 4
the liquid absorption capacity of the separator is improved
Data Source
AI summary
Disclosed is a method for preparing aluminum hydroxide nanowires by a template process. The method includes: (1) dispersing nanocellulose in water to obtain a solution having a concentration of 0.1%-10% by mass; adding an aluminum salt solution to the solution obtained in step (1) and mixing; adding an alkaline solution thereto while stirring, and subjecting a resulting mixture to reactive precipitation, and washing with water and drying, to obtain the aluminum hydroxide nanowires, wherein a mass of an aluminum salt in the aluminum salt solution is in a range of 1-100% of a mass of the nanocellulose, and an alkali in the alkaline solution has a same amount in moles as the aluminum salt in the aluminum salt solution.