Hexagonal Manganese Oxide Particle Synthesis via Alkali Mixing
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Solution Overview
Problem
Conventional methods for producing manganese oxide particles with a novel crystal structure are not practical for industrial production due to the complexity and inefficiency of existing techniques, such as the use of lithium ion release under a microscope.
Innovation Solution
Manganese oxide particles with a hexagonal crystal structure are produced by mixing an aqueous solution containing manganese (II) with an organic compound having a hydroxyl group and an alkali, generating OH− in a controlled amount, which allows for the formation of particles with specific a-axis and c-axis lengths, and alternative processes without the organic compound, optimizing the pH and alkali addition for efficient particle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithium ion release is performed under a microscope using a microelectrode system to obtain manganese dioxide crystal, then the crystal structure can be obtained, but the method is not practical for industrial production due to complexity and inefficiency
Solution Approach 1:
The patent replaces the complex mechanical microelectrode system with a simple wet chemical synthesis method using aqueous alkali solution and hydrogen peroxide, achieving the desired crystal structure through chemical reactions rather than mechanical manipulation under a microscope
Solution Approach 2:
The patent changes the synthesis parameters from microscopic electrochemical conditions to macroscopic wet chemical conditions, using specific pH ranges (9-14), temperatures (0-100°C), and reagent concentrations to control crystal formation, making the process scalable for industrial production
2Shape
If manganese dioxide nanobelt is produced by heating dimanganese trioxide powder in aqueous sodium hydroxide solution at 150-200°C for 72 hours or longer, then the layer structure can be obtained, but the production time is excessively long
Solution Approach 1:
The patent changes the synthesis parameters by using manganese(II) sulfate instead of dimanganese trioxide, adjusting the pH to 9-14, and adding hydrogen peroxide as an oxidizing agent, which reduces the reaction time from 72+ hours to just 1-24 hours while maintaining the desired layer structure
Solution Approach 2:
The patent performs preliminary oxidation of manganese(II) to manganese(III/IV) using hydrogen peroxide in the presence of aqueous alkali, which prepares the material for rapid crystal structure formation and significantly accelerates the overall production process
3Ease of manufacture
If conventional wet synthesis methods are used to produce manganese oxide, then the production process can be simplified, but the crystal structure and performance are inferior to the novel hexagonal structure
Solution Approach 1:
The patent achieves the novel hexagonal crystal structure by precisely controlling the pH range (9-14), temperature (0-100°C), and the presence of hydrogen peroxide during synthesis, demonstrating that simple wet chemical methods can produce superior crystal structures when parameters are optimized
Solution Approach 2:
The patent creates a composite synthesis system combining manganese(II) sulfate, aqueous alkali, and hydrogen peroxide, where each component plays a specific role in controlling the crystal structure formation, resulting in the novel hexagonal manganese oxide with superior properties
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 resulting manganese oxide particles exhibit enhanced performance as positive electrode materials in lithium secondary batteries, gas fixation, semiconductor applications, and other uses, with improved electroconductivity and stability, and are free from expensive or environmentally unfriendly dopant elements.
Implementation Method 1
mixing an aqueous solution containing manganese (II) and an organic compound having a hydroxyl group, while in a heated state, with an alkali
Implementation Method 2
mixing an aqueous solution containing manganese (II) and an organic compound having a hydroxyl group, while in a heated state, with an alkali
Implementation Method 3
mixing an aqueous solution containing manganese (II) and an organic compound having a hydroxyl group, while in a heated state, with an alkali
Data Source
AI summary
A manganese oxide particle having a hexagonal crystal structure or an analogous hexagonal crystal structure with an a-axis length of 8.73±1 Å and a c-axis length of 14.86±1 Å. The manganese oxide particle is preferably produced by a process including mixing an aqueous solution containing manganese (II) and an organic compound having a hydroxyl group while in a heated state with an alkali.