Product Description

I. Basic Properties

• Chemical Formula: MnO₂
• Molecular Weight: 86.94
• Appearance: Black or brownish-black fine powder with a loose and porous crystal structure, different from dense natural manganese dioxide (NMD)
• Core Physicochemical Properties: Excellent electrical conductivity and high electrochemical activity; chemically stable in neutral and alkaline environments, and strongly oxidizing in acidic conditions
• Purity: The MnO₂ content of industrial-grade EMD powder is usually above 90%, and battery-grade products can reach more than 92% with extremely low impurity content (such as iron, copper, nickel, etc.)

II. Production Process

The preparation of EMD powder is a typical wet electrolysis process, with the core steps as follows:

• 1 Raw Material Preparation: Using manganese carbonate or manganese ore as raw materials, manganese sulfate solution is obtained through sulfuric acid leaching.
• 2 Purification Treatment: Processes such as neutralization, precipitation, and filtration are adopted to remove impurities such as iron, aluminum, copper, and nickel from the manganese sulfate solution to ensure the purity of the electrolyte.
• 3 Electrolytic Reaction: The purified manganese sulfate solution is sent to an electrolytic cell, with titanium plates or graphite as the anode and stainless steel as the cathode. Electrolysis is carried out under specific temperature (80–95°C) and current density conditions, and manganese dioxide is deposited on the anode surface.
• 4 Post-treatment: The anode deposit is peeled off, and after washing, crushing, drying, and sieving, EMD powder with different particle size specifications is obtained.

III. Core Applications

With its porous structure and excellent electrochemical performance, EMD powder is irreplaceable in many fields. The main application scenarios are as follows:

• Battery Cathode Material (Largest Application): It is the main cathode material for zinc-manganese dry batteries (including alkaline zinc-manganese batteries and carbon-zinc batteries). During battery discharge, it provides discharge capacity through the reduction reaction of MnO₂.
• Secondary Battery Material: It can be used as a component of cathode materials for lithium-ion batteries and nickel-metal hydride batteries, improving the cycle performance and rate discharge capability of the batteries.
• Catalyst: It is an efficient catalyst for organic synthesis reactions (such as oxidation of phenols, degradation of organic pollutants) and environmental governance (such as catalytic oxidation of industrial waste gas).
• Other Fields: It can be used as a decolorizing agent for glass and ceramics, a raw material for ferrite magnetic materials, and an oxidizing agent in chemical production.

IV. Quality Indicators

The quality of EMD powder is evaluated by multiple indicators, which directly determine its application effect:

• MnO₂ Content: The higher the content, the better the electrochemical performance.
• Impurity Content: Strictly control heavy metal impurities (Fe, Cu, Ni) and alkali metal ions (Na, K), as they will reduce battery efficiency or cause self-discharge.
• Particle Size Distribution: Different particle sizes are suitable for different types of batteries; fine powder is used for alkaline batteries, and coarse powder is used for carbon-zinc batteries.
• Bulk Density and Specific Surface Area: Affect the packing density and reaction contact area in the battery.
• Electrochemical Performance: Including discharge capacity, voltage stability, and cycle life.

V. Comparison with Natural Manganese Dioxide (NMD)

• 1 Production Method:

  EMD: It is a synthetic manganese dioxide produced through an electrolysis process. The common raw material is manganese sulfate solution. Under specific temperature, current density, and pH conditions, Mn²⁺ is oxidized at the anode to deposit as high-purity MnO₂ on the electrode surface. This process is controllable, so the product's purity and crystal structure can be precisely adjusted.

  NMD: It is directly mined from natural manganese ore and processed through crushing, grinding, beneficiation, and purification. Its composition is determined by the ore deposit's geological conditions, so it contains more impurities (such as iron, silicon, aluminum oxides) and has inconsistent properties between different batches.

• 2 Crystal Structure and Morphology:

  EMD: It mainly has a γ-type crystal structure (some modified EMD can have ε-type or composite structures). The crystal particles are uniform, with a porous, loose morphology and large specific surface area. The pore size distribution is also controllable, which is beneficial for ion diffusion.

  NMD: Its crystal structure is complex, often a mixture of α-type, β-type, γ-type, and amorphous phases, depending on the ore source. The particle size is uneven, the specific surface area is smaller than EMD, and the porosity is lower, which limits its electrochemical performance.

Product Showcase

Electrolytic Manganese dioxide powder 90-92%

Natural Manganese dioxide powder 30%-45%

Natural Manganese dioxide powder 60%-75%

Manganese dioxide powder 50%-55%

Natural Manganese dioxide powder 60%-65%

Natural Manganese dioxide powder 70%-75%

Other Typical Applications

• MnO2 Powder is used as a colorant and decolorizer in glass, white ware, enamels and pottery.
• It is also used in battery cathode mixes and electronics.
• There is promising potential to use MnO2 in solid state lithium-ion batteries for automobiles.
• Good Soil conditioner for soil improvement and treatment.

Specifications

Electrolytic Manganese Dioxide Powder Technical Datas

Typical Chemical Compositions and physical datas for 90% grade

Why Choose Us

Strong production capacity and complete equipment

The monthly output of EMD 90 is around 2000 tons. We have a circulating pool, two large magnetic separators, two large drying furnaces, roller screen, vibrating screen, sand washing machine and four 6R Raymond powder production lines, which can supply nearly hundreds of tons of manganese products daily and produce more than ten thousand tons per month. We also have owned laboratory and professional quality inspection personnel, complete and scientific quality management system, fully ensure the quality of products leaving the factory.

Transportation Advantage

Our goods delivery to port by car, by water, by train. We are located in the hub with convenient access to national and provincial roads, ensuring fast transportation. Motor transportation is commonly utilized to reduce handling loss and provide door-to-door delivery. Water transport is suitable for coastal or river regions. Train transport is typically not recommended unless requested due to higher transshipment losses.

Certifications & Third Party Test Reports

All our finished goods have factory-lab test reports. Custom required Inspection Methods are available. Third-party testing services we cooperate with include SGS, BV, and TST.