Corrosion Inhibitor Doping in Electrolytic Manganese Dioxide
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Solution Overview
Problem
Conventional electrolytic manganese dioxide (EMD) used in battery production accelerates corrosion of metal tools and current collectors, leading to increased tool wear and potential adverse effects on battery performance due to the presence of sulfate ions.
Innovation Solution
Incorporating a corrosion inhibitor, such as benzoate salts, phosphate salts, or metaborate salts, into the EMD production process to minimize metal corrosion, either through displacement washing or suspension in an aqueous solution, resulting in improved EMD with reduced sulfate-induced corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EMD is used in battery production, then the material provides excellent discharge and long-term storage performance, but it accelerates corrosion of metal tools and current collectors due to sulfate ions
Solution Approach 1:
A corrosion inhibitor is introduced as an intermediary substance between the sulfate-containing EMD and the metal tools/current collectors. The inhibitor adsorbs onto metal surfaces or reacts with sulfate ions to form protective layers, preventing direct contact between corrosive sulfate and metal surfaces while allowing the EMD to maintain its electrochemical function
Solution Approach 2:
The sulfate ions, which are inherently corrosive and difficult to remove, are converted from harmful agents into beneficial components by adding corrosion inhibitors that specifically target and neutralize their corrosive effect. The sulfate remains in the EMD structure for electrochemical function, while its harmful corrosion effect is eliminated through the inhibitor
2Duration of action of stationary object
If corrosion inhibitors are added to EMD production, then metal tool life is extended and corrosion is reduced, but the production process complexity increases
Solution Approach 1:
The corrosion inhibitor is added during the EMD production process itself, specifically during the electrolysis or washing stages, rather than as a separate post-treatment step. This preliminary incorporation ensures the inhibitor is present on the EMD surface before the material contacts metal tools, eliminating the need for additional handling steps
Solution Approach 2:
The corrosion protection function is merged with the existing EMD production process by incorporating the inhibitor addition into the electrolysis or washing operations. The same equipment and process streams used for EMD manufacturing are utilized to deliver the corrosion inhibitor, avoiding separate production lines or additional complex equipment
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 use of corrosion inhibitors effectively reduces metal corrosion, extending the life of metal tools and maintaining battery performance by maintaining the integrity of the nickel coating and reducing sulfate-induced erosion.
Implementation Method 1
Incorporating a corrosion inhibitor, such as benzoate salts, phosphate salts, or metaborate salts, into the EMD production process to minimize metal corrosion
Implementation Method 2
suspending in an aqueous solution including a corrosion inhibitor
Data Source
AI summary
An electrolytic manganese dioxide improved for tool wear reduction, methods for preparing the improved electrolytic manganese dioxide and for preparing a positive-electrode precursor, and a primary battery are provided. One method includes displacement-washing neutralized electrolytic manganese dioxide with a solution including a corrosion inhibitor configured to be at a first predetermined concentration. The method further includes drying the washed electrolytic manganese dioxide to collect improved electrolytic manganese dioxide including the corrosion inhibitor configured to be at a second predetermined concentration within the improved electrolytic manganese dioxide to minimize corrosion of a metal material in contact with the improved electrolytic manganese dioxide. The corrosion inhibitor includes one of a benzoate salt, a phosphate salt, a carbonate salt, a metaborate salt, a tetraborate salt, a metaperiodate salt, and a meta-aluminate salt.