Graphite oxide/graphene oxide composite material, preparation method thereof, battery anode and capacitor battery

A composite material and graphene technology, applied in the field of electrochemical materials, can solve the problems of high cost, complex process, and low cycle life, and achieve the effects of easy production control, simple process operation, and high cycle life

Inactive Publication Date: 2013-10-23
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

Its capacity is greatly limited, and the preparation process is complicated and the cost is high
At the same time, some organic lithium salts have also been developed as positive electrode materials, but due to the low conductivity, poor thermal stability, and poor mechanical properties of positive electrode materials, their cycle life is generally low, and they are not suitable for electrode positive electrode materials.

Method used

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  • Graphite oxide/graphene oxide composite material, preparation method thereof, battery anode and capacitor battery
  • Graphite oxide/graphene oxide composite material, preparation method thereof, battery anode and capacitor battery
  • Graphite oxide/graphene oxide composite material, preparation method thereof, battery anode and capacitor battery

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preparation example Construction

[0021] The specific embodiment one provides the preparation method of graphite oxide / graphene oxide composite material, such as figure 1 shown, including the following steps:

[0022] S1. Add graphite powder (purity 99.5%), potassium persulfate and phosphorus pentoxide with a mass ratio of 2:1:1 to concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6 hours, wash until neutral, and dry , to obtain a powder sample;

[0023] S2. Add the dried powder sample to concentrated sulfuric acid at 0°C, then add potassium permanganate, keep it mixed at 0-20°C, keep it in an oil bath at 35°C for 2 hours, and then slowly add deionized water, hydrogen peroxide to obtain a mixed solution;

[0024] S3. Suction-filtering the mixed solution in step S2, then washing the filtrate with an acid solution, then suction-filtering and vacuum-drying to obtain the graphite oxide;

[0025] S4. In an oxygen-free environment, place the graphite oxide powder at 800-900° C. for 1-24 hours, s...

Embodiment 1～4

[0042] Embodiment 1~4, is the preparation of graphite oxide / graphene oxide composite material

Embodiment 1

[0044] (1) Graphite: 99.5% purity.

[0045] (2) Graphite oxide: Add 20g of 50 mesh graphite powder, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stir evenly, cool for more than 6h, wash until neutral, and dry. Add the dried sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the mixture below 20°C, then keep it in an oil bath at 35°C for 2h, then slowly add 920mL of deionized water . After 15 minutes, add 2.8L of deionized water (which contains 50mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration while hot, and then wash with 5L of 10% hydrochloric acid, suction filtration, Graphite oxide was obtained by vacuum drying at 60°C for 48 hours.

[0046] (3) Graphite oxide heat treatment: put the prepared graphite oxide powder into a muffle furnace, and react at 900°C for 1 hour under nitrogen protection t...

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Abstract

The invention belongs to the field of electrochemical materials and discloses a graphite oxide/graphene oxide composite material, a preparation method thereof, a battery anode and a capacitor battery. Graphene oxide in the graphite oxide/graphene oxide composite material only contains epoxy and hydroxyl groups. The graphite oxide/graphene oxide composite material contains the epoxy and hydroxyl groups, and after the graphite oxide/graphene oxide composite material is prepared into the battery anode, the epoxy group and lithium ions from a cathode can be subjected to reaction and ring opening to form hydroxyl lithium during discharging in the battery charging/discharging process, so that the capacitance can be increased.

Description

technical field [0001] The invention relates to electrochemical materials, in particular to a graphite oxide / graphene oxide composite material and a preparation method thereof. The invention also relates to a positive electrode of a battery comprising graphite oxide / graphene oxide composite material and a capacitor battery using the positive electrode of the battery as the positive electrode. Background technique [0002] With the development of various new energy sources, the miniaturization of portable electronic devices and the extensive demand for large-capacity and high-power chemical power sources for electric vehicles. At present, most commercial lithium-ion batteries use inorganic cathode / graphite systems, and these cathode materials are mainly lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide and mixed systems. Although this type of system has excellent electrochemical performance, it has many disadvantages such as low capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01G11/38C01B32/184C01B32/198C01B32/23
Inventor 周明杰王要兵钟玲珑
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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