Preparation method of sodium manganese oxide

A sodium manganese oxide and hydroxide technology, applied in manganese compounds, chemical instruments and methods, inorganic chemistry and other directions, can solve problems such as unfavorable large-scale industrial production, and achieve improved specific surface area and surface activity, and improved product purity. , the effect of high charge and discharge efficiency

Active Publication Date: 2014-07-02
紫石能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since a large amount of organic metal salts and organic solvents are used in this method, it is not conducive to large-scale industrial production.

Method used

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  • Preparation method of sodium manganese oxide
  • Preparation method of sodium manganese oxide
  • Preparation method of sodium manganese oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 24.5 kg manganese acetate tetrahydrate (Mn(CH 3 COO) 2 4H 2 O) was dissolved in 100 L of deionized water, and while stirring, 33.4 L of 6 mol / L sodium hydroxide solution (Mn:OH molar ratio was 0.5) was added thereto. Increase the reaction temperature to 50°C and continue stirring for 3 hours to obtain a suspension containing brown precipitates; then dry the obtained suspension by spray drying at a drying temperature of 110°C to obtain a mixture containing the above brown precipitates .

[0038] The obtained mixture was put into a stainless steel sagger for compaction, put into a box furnace, and the temperature was raised to 850°C at a rate of 8°C / min, and kept for 15 hours, and then cooled to room temperature with the furnace to obtain a black sintered product.

[0039] Put the obtained sintered product into a mixing tank equipped with zirconia balls and 80°C deionized water for 3 hours of wet ball milling to form a suspension to promote the dissolution of sol...

Embodiment 2

[0042] Weigh 15.1kg manganese sulfate and 1kg polyethylene glycol 2000 and dissolve them in 50 L of deionized water, while stirring, add 80 L of 6 mol / L sodium hydroxide solution (Mn:OH molar ratio is 0.2 ), after the addition of sodium hydroxide is completed, raise the reaction temperature to 50°C, and continue to stir for 3 hours to obtain a suspension containing brown precipitate; then dry the obtained suspension by vacuum drying at a drying temperature of 100°C , and dried to give a mixture containing the above brown precipitate.

[0043] Put the obtained mixture into a stainless steel sagger for compaction, put it into a box furnace, raise the temperature to 500°C at a rate of 8°C / min, keep it warm for 5 hours, and then raise the temperature to 1200°C at a rate of 12°C / min. And keep it warm for 10 hours, then cool down to room temperature with the furnace to obtain a black sintered product.

[0044] Put the obtained sintered product into a mixing tank equipped with zirco...

Embodiment 3

[0046] The layered Birnessite type sodium manganese oxide powder obtained in Example 1 is mixed with acetylene carbon black and polytetrafluoroethylene according to sodium manganese oxide powder: acetylene carbon black: polytetrafluoroethylene (molar ratio)=8: 1: 1, mix evenly, then add ethanol solvent and stir to prepare a slurry with moderate viscosity, then heat and evaporate the solvent, roll the obtained material into thin slices, put it in a vacuum drying oven and dry it at 120°C for 8 hours, then dry it Cut into 8mm × 8mm positive pole pieces (or punched into negative pole pieces with a diameter of 14 mm); combine activated carbon with acetylene carbon black and polytetrafluoroethylene according to activated carbon: acetylene carbon black: polytetrafluoroethylene (molar ratio) =8 : 1 : 1 ratio mixed evenly, and then according to the preparation method of the above-mentioned positive electrode sheet punched into a negative electrode sheet with a diameter of 14 mm; put the...

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Abstract

The invention relates to a preparation method of a sodium manganese oxide, and particularly relates to a preparation method of a layered birnessite type sodium manganese oxide. The preparation method is as follows: reacting a two valent manganese salt with sodium hydroxide in an aqueous phase to obtain a Mn (OH)2 precipitate and / or MnOOH precipitate-containing suspension, then performing solvent evaporation to obtain a MnOOH precipitate and / or Mn (OH) 2 precipitate-containing mixture; grinding the mixture, and sintering at 600-1200 DEG C to obtain a sintering product; then performing washing and solid-liquid separation for multiple times, and finally drying to obtain a final product. According to the preparation method, molecular level mixing of manganese hydroxide and a sodium salt can be realized by a solution chemical reaction method, promotion of next-step solid phase reaction is facilitated, improvement of the purity of the product is facilitated, and the prepared sodium manganese compound can be used in a sodium ion battery using an aqueous solution as an electrolyte, and helps to improve the charge discharge performance of the battery.

Description

technical field [0001] The invention relates to a preparation method of sodium manganese oxide, in particular to a preparation method of layered birnessite type sodium manganese oxide. The invention also relates to a sodium ion battery. Background technique [0002] Layered birnessite (Birnessite) sodium manganese oxide usually has a two-dimensional layered structure, in which each layer is composed of manganese-oxygen octahedra MnO 6 Composition, the interlayer is composed of H 2 O, Na + (or other metal ions) occupy the filling; the layer spacing is about 0.7nm, which varies with the metal ions and water content. Based on the characteristics of layered crystal structure, layered Birnessite sodium manganese oxide is suitable for use as electrode material, ion exchange material, adsorption material, pollutant treatment material and catalyst. [0003] In recent years, along with the rapid development of wind power and photovoltaic power generation, new breakthroughs in meg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00H01M4/50H01M10/36
CPCY02E60/10
Inventor 李长青侯珊珊岳淑芳
Owner 紫石能源有限公司
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