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Nanosheet sulfide hollow sphere and preparation method and application thereof

A nanosheet and sulfide technology, applied in the field of nanomaterials, can solve the problems of low first Coulombic efficiency, unstable material structure, easy pulverization and agglomeration

Inactive Publication Date: 2018-09-07
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sulfide materials have disadvantages such as poor conductivity during charge and discharge, low initial Coulombic efficiency, unstable material structure, easy pulverization and agglomeration, which lead to rapid decay of battery capacity, etc.

Method used

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  • Nanosheet sulfide hollow sphere and preparation method and application thereof
  • Nanosheet sulfide hollow sphere and preparation method and application thereof
  • Nanosheet sulfide hollow sphere and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example 1

[0046] SiO 2 Ball preparation:

[0047] It is prepared on the basis of the method described in the document titled "Tailoring the Void Size of Iron Oxide@Carbon Yolk–Shell Structure for Optimized Lithium Storage", specifically: first drop 6ml of tetraethyl silicate (TEOS) Add 160mL isopropanol and 40mL distilled water (H 2 O) was stirred for 15 minutes, then 6 mL of NH 3 ·H 2 O was added to the above transparent solution and stirred for about 10 minutes until the transparent solution gradually turned milky white, and continued stirring at 25°C for 24 hours; finally, the white precipitate was collected by centrifugation, washed several times with deionized water and absolute ethanol, and then heated at 60 °C in a vacuum oven overnight.

Embodiment 1

[0049] 1) Add 3mmol of CoSO 4 ·7H 2O and 10mmol of thiourea were dissolved in 20mL of aqueous solution, and another 0.120g of SiO 2 Balls (average particle size: 350nm) were uniformly dispersed in 20mL aqueous urea solution (the content of urea was 8mmol), and then the two were continuously stirred, and reacted at 150°C for 24 hours; then the system was left to stand 12h, the filter cake was taken by suction filtration to obtain a black precipitate;

[0050] 2) Dry the black precipitate in a vacuum drying oven (the drying temperature is 70° C., and the drying time is 20 h) to a constant weight to obtain a black powder, that is, nanosheet sulfide hollow spheres A1.

Embodiment 2

[0052] According to the method of Example 1, the nanosheet sulfide hollow spheres A2 are prepared, the difference is that CoSO 4 ·7H 2 The consumption of O is 1mmol, the consumption of thiourea is 3mmol, the consumption of urea is 2.5mmol, SiO 2 The amount of balls used was 0.04 g.

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Abstract

The invention discloses a nanosheet sulfide hollow sphere and a preparation method and application thereof. The nanosheet sulfide hollow sphere comprises a hollow sphere and a plurality of nanosheets,wherein the multiple nanosheets are distributed at the surface of the hollow sphere, and the average diameter of the hollow sphere is 300 to 400nm; the average length of each nanosheet is 25 to 40nm,and the average thickness of each nanosheet is 0.5 to 1nm; the nanosheet sulfide hollow sphere is prepared from at least one of components of cobalt sulfide, nickel sulfide and cobalt-nickel sulfide.The nanosheet sulfide hollow sphere has the advantages that the electrochemical property is excellent; the nanosheet sulfide hollow sphere can be used as an electrode material for a lithium battery.The preparation method has the advantages that the procedures are simple, and the raw materials are easy to obtain.

Description

technical field [0001] The invention relates to nanomaterials, in particular to a hollow nanosheet sulfide sphere and its preparation method and application. Background technique [0002] With the shortage of social energy and the increasing demand for energy, the constraints of traditional energy in terms of storage, energy efficiency, environmental pollution and cost have become increasingly prominent. Therefore, there is an urgent need for some high-energy, high-power-density energy storage materials to solve the energy crisis, and lithium-ion batteries have emerged as energy storage devices. Lithium-ion batteries have the advantages of high voltage, small size, large capacity and no pollution; however, in lithium-ion batteries, graphite-based anode materials reach the theoretical capacity limit of 372mAh / g, which seriously restricts the development of power batteries. [0003] Sulfide has the advantages of high theoretical capacity, low cost, superior safety performance...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G53/11B82Y30/00B82Y40/00H01M4/58H01M10/0525
CPCB82Y30/00B82Y40/00C01G51/30C01G53/11C01P2002/72C01P2004/03C01P2004/04C01P2004/20C01P2004/34C01P2004/62C01P2006/40H01M4/5815H01M10/0525Y02E60/10
Inventor 王婉婉方臻
Owner ANHUI NORMAL UNIV
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