Mesoporous Electrolytic Manganese Dioxide for High-Rate Alkaline Cells
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Solution Overview
Problem
Existing electrolytic manganese dioxide materials do not adequately enhance cell performance in high rate and middle rate discharge for alkaline manganese dry cells.
Innovation Solution
Electrolytic manganese dioxide with average mesopore size of 6.5 to 10 nm and alkali potential of 290 to 350 mV, produced through controlled electrolysis with varying sulfuric acid concentration, is used as a cathode active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrolytic manganese dioxide with optimized pore structure is used to enhance ion transport, then high rate discharge performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes porous materials by incorporating a specific pore structure with mesopores (3-10 nm) and macropores (10-50 nm) in the electrolytic manganese dioxide. This porous structure enhances ion transport pathways, enabling improved high rate discharge performance. The pore structure is formed through controlled electrolysis conditions rather than complex post-processing, thereby maintaining manufacturing simplicity while achieving the desired performance enhancement.
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
Improves cell performance in high rate and middle rate discharge, maintaining packing density and reducing corrosion, while ensuring stability and conductivity.
Implementation Method 1
producing manganese dioxide by electrolysis in a sulfuric acid/manganese sulfate mixed electrolyte
Data Source
AI summary
To provide electrolytic manganese dioxide excellent in cell performance in high rate discharge and middle rate discharge when used as a cathode material for alkaline manganese dry cells, and a method for its production.Electrolytic manganese dioxide, characterized in that the average size of mesopores is at least 6.5 nm and at most 10 nm, and the alkali potential is at least 290 mV and at most 350 mV; a method for its production and its application.