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Graphene/transition metal phosphide/carbon-based composite, preparation method and lithium ion battery negative electrode

A technology for carbon composite materials and lithium-ion batteries, which is applied in the field of graphene/transition metal phosphide/carbon-based composite materials, preparation, and negative electrodes for lithium-ion batteries. It can solve the problems of less research and achieve uniform particle distribution and small size. , the effect of small particle size

Active Publication Date: 2017-11-28
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 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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  • Graphene/transition metal phosphide/carbon-based composite, preparation method and lithium ion battery negative electrode
  • Graphene/transition metal phosphide/carbon-based composite, preparation method and lithium ion battery negative electrode
  • Graphene/transition metal phosphide/carbon-based composite, preparation method and lithium ion battery negative electrode

Examples

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Embodiment 1

[0031] Weigh graphene, ferric chloride, and glucose, and then dissolve them in distilled water to form a solution with a metal ion concentration of 0.01mol / L-0.1mol / L, and control the carbon content in the final product to be 3 to 10wt%; the resulting mixture Transfer to a high-pressure reactor, heat at 100-220°C for 10-72 hours, and cool naturally to obtain a graphene / iron-based compound / organic carbon source ternary precursor, which is centrifuged, washed, and vacuum-dried at 50-120°C. Then transfer the obtained graphene / transition metal-based compound / organic carbon source to a self-made reactor, add a certain proportion of NaH 2 PO 2 Perform low-temperature phosphating to obtain graphene / iron phosphide / carbon ternary nanocomposite material. The resulting product was analyzed by X-ray diffraction to obtain figure 1 The XRD pattern shown shows the FeP phase. pass figure 2 The TEM image shown shows that the iron phosphide is granular and the particles are deposited on gr...

Embodiment 2

[0034] The molar ratio is (1~2):(1~2):(1~2) Weigh and weigh graphene, cobalt chloride, glucose, precipitant, and then dissolve in distilled water to form a metal ion concentration of 0.01mol / L-0.1mol / L solution, control the carbon content in the final product to be 3-10wt%; transfer the resulting mixture to a high-pressure reactor, heat at 100-220°C for 10-72 hours, and cool naturally to obtain graphene / cobalt-based compound / organic carbon source ternary precursor, centrifuged, washed, and vacuum-dried at 50-120°C. Then transfer the obtained graphene / cobalt-based compound / glucose into a self-made reactor, add a certain proportion of NaH 2 PO 2 Perform low-temperature phosphating to obtain graphene / cobalt phosphide / carbon ternary nanocomposite material. The resulting product was analyzed by X-ray diffraction to obtain figure 1 The XRD pattern shown shows that it is a CoP phase, and it is completely consistent with the no.89-2598 standard card without any other miscellaneou...

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Abstract

The invention provides a graphene / transition metal phosphide / carbon-based composite, a preparation method and a lithium ion battery negative electrode. Transition metal phosphide in the graphene / transition metal phosphide / carbon-based composite is a compound formed by transition metal iron, cobalt or nickel with phosphorus. According to the composite, graphene is taken as a matrix, and transition metal phosphide nanoparticles with good nanostructure are taken as a support, so that a graphene / transition metal phosphide composite is constructed; the composite is subjected to coating, filling, connecting and other modification with amorphous carbon, and the graphene / transition metal phosphide / carbon ternary nano-composite is obtained. The composite has high conductivity and excellent multilevel structure. When the lithium ion battery negative electrode is prepared from the graphene / transition metal phosphide / carbon-based composite, transition metal phosphide with higher specific capacity and good electrical conductivity is combined with graphene and a carbon material, so that the lithium ion battery negative electrode has the characteristics of high capacity, high rate and high cycling stability.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to a graphene / transition metal phosphide / carbon-based composite material, a preparation method and a negative electrode of a lithium-ion battery. Background technique [0002] Automobiles and human development are closely related to the energy crisis and environmental protection. In order to achieve high energy efficiency and low emissions, automobiles are currently entering the stage of electrification technology development. At the same time, the vigorous development of new energy vehicles has posed new challenges and high requirements for power batteries. As the heart of new energy vehicles, power batteries have a direct impact on key factors such as the cost of use, safety and mileage of electric vehicles. Lithium-ion batteries are widely used in the field of energy storage for new energy vehicles due to their advantages such as high operating voltage, large specific energy...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5805H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 栗欢欢刘成洋王亚平陈彪江浩斌陈龙
Owner JIANGSU UNIV
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