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Preparation method of short-fiber flaky cobalt carbonate negative electrode material

A technology of negative electrode materials and short fibers, which is applied in the field of chemistry and can solve the problems of little research on negative electrode materials.

Inactive Publication Date: 2020-06-05
许嘉文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many methods of preparing CoCO3 have been reported, there are few studies on its use as anode material for lithium-ion batteries.

Method used

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  • Preparation method of short-fiber flaky cobalt carbonate negative electrode material
  • Preparation method of short-fiber flaky cobalt carbonate negative electrode material
  • Preparation method of short-fiber flaky cobalt carbonate negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of short fiber flake cobalt carbonate negative electrode material comprises the following steps:

[0018] (1) Fully dissolve 3.003g CO(NH2)2 and 2.4905g Co(CH3OOH)2 in 40ml deionized water respectively;

[0019] (2) Weigh 0.1g CTAB into the CO(NH2)2 solution, fully dissolve and stir;

[0020] (3) Add CO(NH2)2 dropwise to Co(CH;OOH)2, stir magnetically for 20 minutes, and finally transfer the mixed solution into a 100 ml reaction cap, and heat at a certain temperature for 10 hours;

[0021] (4) After heating to the specified time, cool down to room temperature naturally, wash with deionized water and ethanol for 3-4 times, and dry in vacuum at 50°C for 10 hours after cleaning to obtain a pink powder.

[0022] In order to compare the electrochemical performance of cobalt carbonate anode materials prepared at different temperatures, in the step (3), the water temperature was heated to 120°C, and the pink powder prepared at this temperature was named...

Embodiment 2

[0024] The difference between this example and Example 1 is that in step (3), the water temperature was heated to 160°C, and the pink powder prepared at this temperature was named CC-2.

Embodiment 3

[0026] The difference between this example and Example 1 and Example 2 is that in step (3), the water temperature was heated to 180°C, and the pink powder prepared at this temperature was named CC-3.

[0027] XRD was used to analyze the phases of the samples prepared at different temperatures, such as figure 1 As shown, the three strong peaks of the three groups of samples correspond to the CoCO3 (JCPDS No.11-0692) card, and the strong H peaks are obvious at 2θ of 32.6°C, 25°C and 53.8°C, and the crystallinity is good.

[0028] From figure 2 It can be seen from the figure that at 120°C, the basic material of CC-1 particles is flaky CoCO3, and the formed CoCO3 has different shapes and is relatively messy. At 160°C, the material that makes up the CC-2 particle unit is micron-short fiber-like CoCO3, which is superimposed into a unit after being assembled into a sheet, forming an explosive flower pattern, and the short fibers that do not participate in the sheeting are randomly ...

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Abstract

The invention provides a preparation method of a short-fiber flaky cobalt carbonate negative electrode material in the field of chemistry, and the method comprises the following steps: (1)fully dissolving 3.003 g of CO (NH2)2 and 2.4905 g of Co (CH3OH)2 in 40 ml of deionized water respectively; (2)weighing 0.1 g of CTAB (Cetyltrimethyl Ammonium Bromide), adding the CTAB into a CO (NH2)2 solution,and fully dissolving and stirring; (3)dropwise adding the CO (NH2)2 into the Co (CH3OOH)2, magnetically stirring for 20 minutes, finally transferring the mixed solution into a 100 ml reactor, and heating for 10 hours at a certain temperature; and (4) after heating for 10 h, naturally cooling to room temperature, centrifugally cleaning with deionized water and ethanol for 3-4 times, and drying invacuum at 50 DEG C for 10 hours after cleaning to obtain pink powder; CoCO3 with good electrochemical performance is prepared by using the method and is used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a preparation method of a short-fiber sheet-shaped cobalt carbonate negative electrode material. Background technique [0002] The conversion-type negative electrode represented by W new transition metal oxide has a storage capacity far from that of the currently used C negative electrode (372mAhg -1 ). However, compared with the transformation-type metal carbonates proposed in recent years, the preparation of transition metal oxides ultimately requires atmosphere-protected sintering, and the production cost is high. research hotspot in recent years. Among them, CoCO3, as an anode material for lithium-ion batteries, has been widely studied because of its specific capacity as high as 1200 mAhgi, which is three times the theoretical capacity of graphite. Although many methods of preparing CoC have been reported, there are few studies on using it as anode material for Li-ion ...

Claims

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Application Information

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IPC IPC(8): C01G51/06H01M4/58H01M10/0525
CPCC01G51/06C01P2002/72C01P2004/30C01P2006/40H01M4/5825H01M10/0525Y02E60/10
Inventor 许嘉文
Owner 许嘉文
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