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
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  • 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

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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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0032] Example 1

[0033] Add 23.32 g of Na to a 250 ml PTFE tank at the ratio of Na:Mn molar ratio 1.1:1 2 CO 3 , 34.78 g MnO 2 Ball mill with 50 ml of ethanol for 6 hours to form a uniform slurry; then, transfer the slurry to a stainless steel tray and place it in an oven at 60°C for drying to obtain a uniformly mixed raw material powder; then apply a pressure of 10 MPa The raw material powder is pressed into a corundum crucible, heated to 900°C at a rate of 10°C / min, and kept for 10 hours for sintering. After the sintering is completed, the sintered product is naturally cooled to room temperature to obtain a black block sintered product.

[0034] Grind the obtained sintered product, add it to 200 mL of deionized water at 80°C and repeat washing-filtering 4 times, mechanically stirring for 2 hours during washing, and then washing-filtering with 1:1 ethanol solution once , And then dried in an oven at 80°C to obtain the final product. See figure 1 , The final product obtained by ...

Example Embodiment

[0035] Example 2

[0036] According to the molar ratio of Na:Mn 1.1:1, 34.98 gNa 2 CO 3 And 45.76 g Mn 3 O 4 The dry powder is uniformly mixed by grinding, and then compressed with a pressure of 8 MPa, placed in a corundum crucible, raised to 850°C at a rate of 5°C / min, and kept for 12 hours for sintering. After the sintering is completed, it is naturally cooled to room temperature. Sintered product of black block.

[0037] The obtained sintered product was ground and crushed, added to 300 ml of deionized water and repeatedly washed-filtered 3 times, mechanically stirred at room temperature during the washing process for 3 hours, and then vacuum dried at a temperature of 85° C. for 10 hours to obtain the final product. See figure 1 , The final product obtained by XRD pattern analysis is the layered structure of hydrated manganese sodium 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 sodium ion batteri...

Example Embodiment

[0038] Example 3

[0039] According to the molar ratio of Na:Mn 2:1, 56.82 g Na 2 SO 4 And 34.78 g MnO 2 The dry powder is ball-milled and mixed uniformly; afterwards, it is compressed 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 the sintering is completed, it is naturally cooled to room temperature Sintered product of black block.

[0040] The obtained sintered product was ground and crushed, added to 500ml of deionized water at 85°C and washed-filtered 4 times repeatedly, stirred ultrasonically for 2 hours during the washing process, washed-filtered once with a 1:1 acetone solution, and then frozen After drying for 10 hours, the final product was obtained.

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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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