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Fluorination grapheme-lithium vanadium phosphate composite material, as well as preparation method and application thereof

A technology of vanadium lithium fluorophosphate and fluorinated graphene, which is applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low conductivity and stability of fluorinated graphite materials, and poor high-current performance of batteries

Active Publication Date: 2012-07-11
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some shortcomings, such as the low conductivity and stability of fluorinated graphite materials, which lead to poor high-current performance of the battery, etc.

Method used

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  • Fluorination grapheme-lithium vanadium phosphate composite material, as well as preparation method and application thereof
  • Fluorination grapheme-lithium vanadium phosphate composite material, as well as preparation method and application thereof
  • Fluorination grapheme-lithium vanadium phosphate composite material, as well as preparation method and application thereof

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[0018] The embodiment of the present invention provides a method for preparing a fluorinated graphene-lithium vanadium phosphate composite material which is simple in process, low in cost and suitable for industrial production. For the process flow of the preparation method of the fluorinated graphene-lithium vanadium phosphate composite material, please refer to figure 1 , the method includes the following steps:

[0019] S1: Obtain graphene;

[0020] S2: mixing the graphene with vanadium pentoxide, fluoride salt, phosphate salt, and lithium salt to form a mixture;

[0021] S3: Calcining and cooling the mixture in an oxygen-free environment to obtain the fluorinated graphene-lithium vanadium phosphate composite material.

[0022] Specifically, in the S1 step of the above-mentioned fluorinated graphene-lithium vanadium phosphate composite material preparation method, the graphene acquisition method is preferably as follows:

[0023] SA1: Preparation of Graphene Oxide: Graph...

Embodiment 1

[0033] The preparation of fluorinated graphene-lithium vanadium phosphate composite material, its method technological process is as follows:

[0034] S11: Preparation of graphene: graphene was prepared by the improved Hummers method;

[0035] S111: Graphite oxide: Graphene oxide is prepared by the improved Hummers method; the specific steps are: add 20g of graphite powder (50 mesh), 10g of potassium persulfate and 10g of phosphorus pentoxide to concentrated sulfuric acid at 80°C, and stir evenly , cooled for more than 6 hours, then filtered, washed until neutral, dried, and added the dried sample to 0°C, 230ml of concentrated sulfuric acid, then added 60g of potassium permanganate, and kept the temperature below 20°C, then in After keeping in an oil bath at 35°C for 2 hours, slowly add 920ml of deionized water, and after 15 minutes, continue to add 2.8L of deionized water (which contains 50ml of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow,...

Embodiment 2

[0045] The preparation of fluorinated graphene-lithium vanadium phosphate composite material, its method technological process is as follows:

[0046] S21: Preparation of graphene: prepare graphene by improved Hummers method;

[0047] S211: graphite oxide: refer to the S111 step in embodiment 1;

[0048] S212: Preparation of graphene: Add 100 mg of graphene oxide prepared in step S21 and 100 ml of deionized water into a 250 ml round-bottomed flask. At this time, the solution is a brownish yellow suspension, and then the suspension is treated with a 150W ultrasonic wave Ultrasonic dispersion, followed by adding ethylenediamine (1ml, 98%) and heating to 100°C for 24-48h, then filtering, washing with 300ml of water and 300ml of methanol in turn, drying in a vacuum oven at 80°C for 48h, to obtain Graphene;

[0049] S22: Preparation of fluorinated graphene and lithium vanadium phosphate composite: take 0.095mol of V 2 o 5 Powder, 0.2mol LiAC, 0.2mol NH 4 h 2 PO 4 , 20g of gr...

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Abstract

The invention discloses a fluorination grapheme-lithium vanadium phosphate composite material, as well as the preparation method and the application thereof. The preparation method for the fluorination grapheme-lithium vanadium phosphate composite material comprises the steps as follows: obtaining grapheme; mixing the grapheme with vanadic oxide, villiaumite, phosphate and lithium to form a mixture; calcining and cooling the mixture in the oxygen-free environment to obtain the fluorination grapheme-lithium vanadium phosphate composite material. The preparation method for the fluorination grapheme-lithium vanadium phosphate composite material has a simple technology, is low in cost and contamination-free, and is suitable for industrialized production. The fluorination grapheme-lithium vanadium phosphate composite material prepared through adopting the method has stable structural performance and high electric conductivity, and has high power density when applied for preparing a lithium ion battery or / and anode material of a capacitor.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and specifically relates to a fluorinated graphene-lithium vanadium phosphate composite material and a preparation method and application thereof. Background technique [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004. Due to its unique structure and optoelectronic properties, it has attracted extensive attention. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Such as: 1, high strength, Young's molar weight, (1,100GPa), breaking strength: (125GPa); 2, high thermal conductivity, (5,000W / mK); 3, high conductivity, carrier transport rate, ( 200,000cm 2 / V*s); 4, high specific surface area, (theoretical calculation value: 2,630m 2 / g). In particular, its high co...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/36
CPCY02E60/122Y02E60/10
Inventor 周明杰潘军王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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