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Cobalt vanadate and reduced graphene oxide composite negative electrode material and preparation method thereof

A graphene composite, negative electrode material technology, applied in battery electrodes, final product manufacturing, electrochemical generators and other directions, can solve problems such as difficult synthesis of nanoparticle and graphene composite materials, unfavorable large-scale production, and few synthesis methods. , to achieve the effects of excellent cycle stability and rate performance, shortened production cycle and low cost

Inactive Publication Date: 2019-04-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] co x V 3-x o 4 There are very few synthetic methods, and the only method is difficult to synthesize, and the cycle is very long, which is not conducive to large-scale production; Co x V 3-x o 4 Composite materials of nanoparticles and graphene are more difficult to synthesize

Method used

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  • Cobalt vanadate and reduced graphene oxide composite negative electrode material and preparation method thereof
  • Cobalt vanadate and reduced graphene oxide composite negative electrode material and preparation method thereof
  • Cobalt vanadate and reduced graphene oxide composite negative electrode material and preparation method thereof

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preparation example Construction

[0040] The cobalt vanadate and reduced graphene oxide composite negative electrode material prepared by the preparation method of the present invention is characterized in that the cobalt vanadate and reduced graphene oxide composite negative electrode material is Co 1.8 V 1.2 o 4 Lithium-ion battery anode material composited with reduced graphene oxide.

[0041] The method for preparing a lithium battery from the cobalt vanadate and reduced graphene oxide composite negative electrode material of the present invention: mix the cobalt vanadate and reduced graphene oxide composite negative electrode material with 20% conductive agent, and then mix with 10% binder Mix the N-methylpyrrolidone solution, stir evenly, apply it on the copper foil, put it in a vacuum oven and dry it at 100°C; then use a slicer with a diameter of 14mm to cut out the electrode piece, put it in a vacuum oven and dry it at 80°C for 6 ~12h; then transferred to a glove box filled with argon, with metal lit...

Embodiment 1

[0045] Weigh 0.06g of graphene oxide and 0.374g of ammonium metavanadate, add them into 64mL of water, ultrasonicate for 30 minutes, and add 0.08g of lithium hydroxide monohydrate and 0.152g of cobaltous chloride hexahydrate in a water bath at 80°C, and stir for 10 Minutes, the above mixed solution was added to the hydrothermal reaction kettle, stirred and reacted at 180°C for 10 minutes, centrifuged, dried, and the dried sample was calcined at 400°C for 1 hour under an inert atmosphere to obtain cobalt vanadate and reduced graphene oxide Composite anode materials.

[0046] Implementation effect: the novel Co prepared in this embodiment 1.8 V 1.2 o 4 Assembled with the reduced graphene oxide composite anode material to form a battery for charge and discharge tests, Figure 5 (c) is a cycle performance diagram of a lithium-ion battery assembled at a current density of 100mA / g and a voltage range of 3-0.01V. It can be seen that the first discharge capacity is 1199mAh / g, the ...

Embodiment 2

[0048] Weigh 0.374g of ammonium metavanadate, add it into 64mL of water, ultrasonicate for 30 minutes, add 0.08g of lithium hydroxide monohydrate and 0.152g of cobalt chloride hexahydrate in a water bath at 80°C, stir for 10 minutes, and dissolve the above mixed solution Add it into a hydrothermal reaction kettle, stir and react at 180°C for 10 minutes, centrifuge, dry, and calcinate the dried sample at 400°C for 1 hour under an inert atmosphere to obtain the cobalt vanadate negative electrode material.

[0049] Implementation effect: the new cobalt vanadate negative electrode material prepared in this example is assembled into a battery for charge and discharge test, and the charge and discharge test is carried out at a current density of 100mA / g. The first discharge capacity is 1701mAh / g, and the cycle is 100 The remaining discharge capacity after one cycle is only 112mAh / g.

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Abstract

The invention discloses a cobalt vanadate and reduced graphene oxide composite negative electrode material and a preparation method thereof. The preparation method comprises the steps of adding graphene oxide and ammonium metavanadate into deionized water, and carrying out ultrasonic dispersion, adding lithium hydroxide monohydrate and cobalt chloride hexahydrate under a water bath condition at the temperature of 80 DEG C and performing stirring for 10 minutes to obtain a mixed solution, and then carrying out a hydrothermal reaction at 180 DEG C for 10 minutes, and performing centrifuging anddrying, and performing calcining on the dried product in an inert atmosphere to obtain a product. By adoption of the preparation method, the prepared cobalt vanadate and reduced graphene oxide composite negative material has very high cycling stability and rate performance, the synthesis method is simple and easy to operate, the reaction time is short, and the cost is relatively low, and the negative electrode material is expected to become a novel negative electrode material for large-scale use.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite negative electrode material of cobalt vanadate and reduced graphene oxide and a preparation method thereof. Among them, the composite anode material of cobalt vanadate and reduced graphene oxide is Co 1.8 V 1.2 o 4 Composite anode material with reduced graphene oxide. Background technique [0002] Lithium-ion batteries have become indispensable electrochemical energy storage devices in modern life due to their high energy density and long cycle life. However, with the development of consumer electronics and electric vehicles, the current anode materials for lithium-ion batteries cannot meet the growing requirements. In order to meet the needs of social development, scientists are working hard to explore advanced alternatives to replace graphite anodes. Notably, cobalt oxides have received special attention due to their high theoretical capacities. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/587H01M4/62H01M10/0525H01M10/058
CPCH01M4/362H01M4/485H01M4/525H01M4/587H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李莉萍张丹徐兴良李广社
Owner JILIN UNIV
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