Preparation method of block NiS2 and application of block NiS2 to sodium-ion battery

A block and centrifugal separation technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., to achieve the effect of reducing electrode potential, increasing contact area, and high capacity retention

Inactive Publication Date: 2016-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, sulfides have attracted great interest as Na-ion anode materials due to their excellent electrochemical performance, but so far, there is no research on NiS 2 Report as an anode material for sodium-ion batteries

Method used

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  • Preparation method of block NiS2 and application of block NiS2 to sodium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0031] ①With 5mmol of commercialized Ni(NO 3 ) 2 4H 2 Dissolve O in 30mL of methanol, stir for an appropriate amount of time until it is completely dissolved; ②Dissolve 20mmol of 2-methylimidazole in 30mL of methanol, stir until it is completely dissolved. Pour ② into ① and let it stand at room temperature for 24 hours. Then, after centrifuging and washing with methanol three times, dry it in a drying oven at 50°C for 12 hours to obtain a precursor containing Ni, then take an appropriate amount of precursor and sulfur powder and grind them in an agate mortar with a mass ratio of 2:1, and then vacuum seal The tube was heat-treated in a tube furnace at 600°C to obtain the product. SEM( figure 2 A) and TEM ( figure 2 B) The results show that the synthesized NiS 2 It is a bulky morphology composed of nanoparticles, and XRD ( figure 1 ) results show that its purity is high, its crystallinity is good, and it is a single pure phase.

[0032] The prepared NiS 2 The active m...

Embodiment 2

[0034] ①With 5mmol of commercialized Ni(NO 3 ) 2 4H 2 Dissolve O in 30mL of methanol, stir for an appropriate amount of time until it is completely dissolved; ②Dissolve 15mmol of 2-methylimidazole in 30mL of methanol, stir until it is completely dissolved. Pour ② into ① and let it stand at room temperature for 2 hours. Then, after centrifuging and washing with methanol three times, dry it in a drying oven at 50°C for 12 hours to obtain a precursor containing Ni, then take an appropriate amount of precursor and sulfur powder and grind them in an agate mortar with a mass ratio of 4:1, and then vacuum seal The tube was heat-treated in a tube furnace at 400°C to obtain the product. Detected by SEM and TEM, the results showed that the synthesized NiS 2It is a block shape composed of nanoparticles, and the XRD results show that its purity is high, and it is a single NiS 2 crystal phase.

[0035] The method for preparing the sodium ion battery is as in Example 1, and the prepar...

Embodiment 3

[0037] ①With 5mmol of commercialized Ni(NO 3 ) 2 4H 2 Dissolve O in 30mL of methanol, stir for an appropriate amount of time until it is completely dissolved; ②Dissolve 25mmol of 2-methylimidazole in 30mL of methanol, stir until it is completely dissolved. Pour ② into ① and let it stand at room temperature for 18 hours. Then, after centrifuging and washing with methanol three times, dry it in a drying oven at 50°C for 12 hours to obtain a precursor containing Ni, then take an appropriate amount of precursor and sulfur powder and grind them in an agate mortar with a mass ratio of 1:1, and then vacuum seal The tube was heat-treated in a tube furnace at 800°C to obtain the product. Detected by SEM and TEM, the results showed that the synthesized NiS 2 It is a block shape composed of nanoparticles, and the XRD results show that its purity is high, and it is a single NiS 2 crystal phase.

[0038] The method for preparing the sodium ion battery is as in Example 1, and the prep...

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Abstract

The invention discloses a preparation method of block NiS2 and an application of the block NiS2 to a sodium-ion battery. According to the method, a 2-methylimidazole alcohol solution is added to a nickel salt alcohol solution, the mixture is evenly mixed, left to stand, subjected to centrifugal separation and dried, and nickel precursors are obtained; the nickel precursors and sulfur powder are ground and mixed, the mixture is placed in a vacuum environment for heat treatment, and a block NiS2 material comprising high-purity NiS2 nano spherical small particles is obtained. The material is used as an anode material to be applied to the sodium-ion battery and shows excellent electrochemical properties such as the high specific capacity, the long cycle life and the like; the preparation method of the block NiS2 material is simple, the cost is low, and industrial production requirements are met.

Description

technical field [0001] The invention relates to a block NiS 2 The preparation method and application of, especially relate to a kind of bulk NiS 2 The invention relates to an application of a negative electrode material in a sodium ion battery; it belongs to the field of the sodium ion battery. Background technique [0002] Since the beginning of the 21st century, population, food, energy, resources and the environment have been recognized as the world's five major problems, among which the energy problem is the most important problem that people have to consider and solve immediately. With the continuous increase of human demand for energy, fossil energy can no longer meet human needs due to its limited content on the earth, non-renewable and environmental pollution. So humans are exploring various clean energy sources, such as lithium-ion batteries that have been commercially used. However, lithium resources as lithium-ion battery materials cannot meet the requirements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/11H01M4/58H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G53/11C01P2002/72C01P2004/03C01P2004/04C01P2004/64H01M4/5815H01M10/054Y02E60/10
Inventor 刘军朱坤杰杨浩然王浩何鹏辉谢天
Owner CENT SOUTH UNIV
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