Vanadium selenide/carbon-based composite material, preparation method of material, and negative electrode of lithium ion battery

A technology of carbon-based composite materials and lithium-ion batteries, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of less research and achieve the effects of uniform distribution, high rate, and high cycle stability

Active Publication Date: 2014-09-17
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this type of material, like layered disulfides, has the potential to be used as an anode material for lithium-ion batteries, but there is still very little research in this area.

Method used

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  • Vanadium selenide/carbon-based composite material, preparation method of material, and negative electrode of lithium ion battery
  • Vanadium selenide/carbon-based composite material, preparation method of material, and negative electrode of lithium ion battery
  • Vanadium selenide/carbon-based composite material, preparation method of material, and negative electrode of lithium ion battery

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Experimental program
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Embodiment 1

[0037] Weigh NH according to molar ratio (1~2):(1~2):(1~2) 4 VO 3 , SeO 2 and a formic acid reducing agent, and then dissolved in distilled water to form a solution with a vanadium ion concentration of 0.01mol / L-0.1mol / L, adding graphene oxide as a carbon source, and controlling the carbon content of the final product to be 3-10wt%. Transfer the mixture to a 20-100 ml autoclave, heat at 100-220°C for 10-72 hours, cool naturally to obtain a black product, centrifuge, wash, and vacuum-dry at 50-120°C to obtain vanadium diselenide / graphene composites. The resulting product was analyzed by X-ray diffraction to obtain figure 1 The XRD pattern shown shows that it is hexagonal VSe 2 Phase, and fully consistent with the no.89-1641 standard card without any other miscellaneous phase. pass figure 2 The shown SEM figure shows that the product is a plate-shaped particle, and further passed image 3 The TEM image shown shows plate-like particles deposited on graphene sheets. Sin...

Embodiment 2

[0040] Graphene in embodiment 1 is replaced by porous conductive carbon black Ketjenblack EC600JD, others are like embodiment 1, under 100 milliamperes / gram current density, the first three weeks charge and discharge test results are as follows Figure 7 shown. The charge and discharge capacities in the first three weeks were 384 / 586, 388 / 435, and 382 / 416 mAh / g, respectively.

Embodiment 3

[0042] Graphene in embodiment 1 is replaced by microporous superconducting carbon black BP2000, and others are as embodiment 1, and under 100 milliamps / gram current density, the first three weeks charge and discharge test results are as follows Figure 8 shown. The charge and discharge capacities in the first three weeks were 480 / 794, 479 / 540, and 471 / 509 mAh / g, respectively.

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Abstract

The invention provides a vanadium selenide/carbon-based composite material, a preparation method of the material, and a negative electrode of a lithium ion battery. Vanadium selenide in the vanadium selenide/carbon-based composite material is of a hexagonal crystal system and is deposited on the surface of a carbon-based material, or the surfaces of vanadium selenide particles are at least partially coated with the carbon-based material to form vanadium selenide/carbon particles of a core shell-like structure; the vanadium selenide/carbon particles are connected through carbon nets to obtain the high conductivity. In the negative electrode of the power lithium ion battery, prepared from the vanadium selenide/carbon-based composite material provided by the invention, since selenide with the relatively large specific capacity is combined with the carbon-based material, the negative electrode has the characteristics of large capacity, high rate and high cyclic stability. Therefore, the negative electrode made of the composite material has the relatively large capacity, relatively long service life and relatively low price when applied to the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a vanadium diselenide / carbon-based composite material, a preparation method and a negative electrode of a lithium-ion battery. Background technique [0002] In recent years, with the rapid development of new energy vehicles such as hybrid vehicles and pure electric vehicles, lithium-ion batteries are facing increasing challenges. The development of lithium-ion batteries with high specific capacity, high power, long cycle life and low cost has become an inevitable direction of its development. The electrode material is the core of the lithium-ion battery system, and the negative electrode material is an important factor to improve the energy density and cycle life of the lithium-ion battery. At present, most of the anode materials used commercially are graphite anode materials. This type of negative electrode material has a good charge-discharge platform and structural stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/136
CPCY02E60/122H01M4/13H01M4/366H01M4/58H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 栗欢欢王亚平陈龙江浩斌钱彬彬张丽丽刘宗涛
Owner JIANGSU UNIV
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