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Preparing method of sodium-ion battery cathode material

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, non-aqueous electrolyte batteries, circuits, etc., to achieve high charge and discharge efficiency and energy efficiency, improve electrochemical activity, and have no environmental pollution effects

Inactive Publication Date: 2014-07-02
DONGTAI HI TECH EQUIP TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A new cheap asymmetric aqueous supercapacitor : Activated carbon / / NaMnO 2 ( Q.T.Qu et al. Journal of Power Sources, 194(2009) P1222-1225 ) discloses a method of roasting raw materials in air to prepare NaMnO 2 The method is to combine ε-MnO 2 Nanopowder and Na 2 CO 3 After ball milling for 12 h at equal stoichiometric ratios, they were calcined at 870 °C for 10 h without any post-treatment. Although most of the phases in the calcined product were α-NaMnO 2 , but there is still a small amount of Na 0.7 MnO 2 Impurities

Method used

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  • Preparing method of sodium-ion battery cathode material
  • Preparing method of sodium-ion battery cathode material
  • Preparing method of sodium-ion battery cathode material

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Experimental program
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Embodiment 1

[0033] Add 23.32 g Na 2 CO 3 , 34.78 g MnO 2 and 50 ml of ethanol for ball milling for 6 hours to form a homogeneous slurry; then, transfer the slurry to a stainless steel tray, put it in an oven at 60°C for drying, and obtain a uniformly mixed raw material powder; then use a pressure of 10 MPa Press the raw material powder into a corundum crucible, raise the temperature to 900°C at a rate of 10°C / min, and keep it warm for 10 hours for sintering. After the sintering is completed, naturally cool to room temperature to obtain a black block sintered product.

[0034] Grind and pulverize the obtained sintered product, add it to 200 mL of deionized water at 80°C for repeated washing-filtering 4 times, mechanically stir for 2 hours during the washing process, then wash-filtering once with 1:1 ethanol solution , and then dried in an oven at 80° C. to obtain the final product. see figure 1 , the final product obtained by XRD pattern analysis is a layered structure of hydrated sodi...

Embodiment 2

[0036] According to the ratio of Na:Mn molar ratio 1.1:1, 34.98 gNa 2 CO 3 and 45.76 g Mn 3 o 4 The dry powder is ground and mixed evenly, and then pressed into tablets with a pressure of 8 MPa, put into a corundum crucible, raised to 850°C at a rate of 5°C / min, and kept for 12 hours for sintering. After sintering, it is naturally cooled to room temperature to obtain Sintered product of black mass.

[0037] The obtained sintered product was ground and pulverized, added to 300ml of deionized water and repeatedly washed-filtered 3 times, mechanically stirred at room temperature for 3 hours during the washing process, and then vacuum-dried at 85°C for 10 hours to obtain the final product. see figure 1 , the final product obtained by XRD pattern analysis is a layered structure of hydrated sodium manganese base NaMnO 2 ·H 2 O. The specific surface area of ​​the product is shown in Table 1; the performance index of the product used in the sodium ion battery is shown in Tab...

Embodiment 3

[0039] According to the ratio of Na:Mn molar ratio 2:1, 56.82 g Na 2 SO 4 and 34.78 g MnO 2 The dry powder was ball-milled and mixed evenly; after that, it was pressed into tablets with a pressure of 10 MPa, put into a corundum crucible, raised to 1000°C at a rate of 5°C / min, and kept for 6 hours for sintering. After sintering, it was naturally cooled to room temperature to obtain Sintered product of black mass.

[0040] Grind and pulverize the obtained sintered product, add it to 500ml, 85°C deionized water, wash and filter repeatedly 4 times, stir ultrasonically for 2 hours during the washing process, wash and filter once with 1:1 acetone solution, and then freeze Drying for 10 hours gave the final product.

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Abstract

The invention relates to a preparing method of a sodium-ion battery cathode material, and particularly relates to a preparing method of a manganese-based sodium cathode material. The preparing method includes mixing a sodium-containing compound and a manganese-containing compound according to a ratio that the molar ratio of Na to Mn is larger than 1; sintering at 600-1000 DEG C for 6-20 h; cooling to the room temperature to obtain a sintered product; smashing the sintered product; performing washing / solid liquid separation repeatedly for a plurality of times; and drying to obtain a final product. According to the method, the excess sodium-containing compound is adopted to increase the solid phase reaction speed between the sodium-containing compound and the manganese-containing compound and to increase the conversion rate. Modification of an alkaline intermediate is utilized to enhance the electrochemical activity of the product. Excess sodium-containing by-products after the reaction is finished can be removed in the washing / solid liquid separation step.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a sodium ion battery, in particular to a method for preparing a manganese-based sodium positive electrode material. Background technique [0002] In the context of the increasing shortage of mineral resources such as petroleum and coal and the vigorous promotion of energy conservation and environmental protection, renewable energy represented by wind energy and solar energy is widely considered to be the most promising alternative energy. However, in the process of using renewable energy to generate electricity, the generation of electric energy is intermittent, which makes the output of electric energy unstable, which in turn affects the quality and stability of power supply. The equipment of large-capacity energy storage batteries can fundamentally ensure stable power output, meeting the needs of safe grid connection of clean energy such as solar energy and wind energy, ...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCY02E60/122H01M4/505H01M10/05Y02E60/10
Inventor 李长青侯珊珊
Owner DONGTAI HI TECH EQUIP TECH (BEIJING) CO LTD
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