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Lithium salt-graphene derivative composite material and preparation method and application thereof

A technology of composite materials and derivatives, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of unsuitable electrode materials, low cycle life, and high cost

Active Publication Date: 2013-06-05
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of system has excellent electrochemical performance, it has many shortcomings such as low capacity (such as the theoretical 170mAh / g of lithium iron phosphate), complex preparation process, and high cost.
In addition, some organic lithium salts have also been developed as positive electrode materials, but due to the electrical conductivity, thermal stability, and mechanical properties of the materials, the cycle life is generally low, and they are not suitable for use as electrode materials.

Method used

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  • Lithium salt-graphene derivative composite material and preparation method and application thereof

Examples

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preparation example Construction

[0026] see figure 1 , the preparation method of the lithium salt-graphene derivative composite material includes the following steps.

[0027] Step S101, oxidizing graphite, potassium permanganate and concentrated sulfuric acid to obtain graphite oxide.

[0028] Graphite oxide can be prepared by a modified Hummers method (Hummers WS, Offeman R E. [J]. J Am Chem Soc, 1958, 80: 1339-1339). The specific steps are: 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 mixtu...

Embodiment 1

[0048] Present embodiment prepares the technological process of graphite oxide as follows:

[0049] Graphite → Graphite Oxide → Graphene Oxide Derivatization → Graphene Derivatives → Lithium Salt Graphene Derivatives

[0050] (1) Graphite: 99.5% purity.

[0051] (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 o...

Embodiment 2

[0056] The technical process that the present invention prepares graphite oxide is as follows:

[0057] Graphite → Graphite Oxide → Graphene Oxide Derivatization → Graphene Derivatives → Lithium Salt Graphene Derivatives

[0058] (1) Graphite: 99.5% purity.

[0059] (2) Graphite oxide: the preparation method is the same as in Example 1.

[0060] (3) Graphite oxide derivatization: 30mL 1g / L graphite oxide was ultrasonically dissolved in DMF solution for 1h, the obtained suspension was added to a three-necked flask, and 50mL 1g / L 5,8-diaminonaphthoquinone was added under vigorous stirring The ethanol solution of the amine was refluxed at 80° C. for 24 hours, and then a catalytic amount of ferric chloride solution was added, and the solution was refluxed at 80° C. for 24 hours to obtain a 5,8-diaminonaphthoquinone amine polymer derivative of graphene oxide.

[0061] (4) Graphene derivatives: the 5,8-diaminonaphthoquinone amine polymer derivatives of graphene oxide obtained in (...

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Abstract

The invention relates to a lithium salt-graphene derivative composite material, and a preparation method and the application of the lithium salt-graphene derivative composite material. The lithium salt-graphene derivative composite material is composed of lithium salt and amino quinone derivatives of graphene, wherein the mass percent of the amino quinone derivatives of the graphene in the lithium salt-graphene derivative composite material is 5-75%. According to the lithium salt-graphene derivative composite material, the amino quinone derivatives of the graphene and the lithium salt are crystallized in a composite mode, the lithium salt-graphene derivative composite material is enabled to be rich in hydroxyl lithium, and when the lithium salt-graphene derivative composite material is used as an electrode material, the maximum capacity can be up to 250mAh / g. Compared with traditional electrode materials, the lithium salt-graphene derivative composite material has the advantage of being high in specific capacity.

Description

【Technical field】 [0001] The invention relates to the technical field of electrode materials, in particular to a lithium salt-graphene derivative composite material and its preparation method and application. 【Background technique】 [0002] With the development of various new energy sources, various electronic devices, such as portable electronic devices and electric vehicles, have more and more demands for large-capacity and high-power chemical power supplies. 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 shortcomings such as low capacity (such as the theoretical 170mAh / g of lithium iron phosphate), complex preparation process, and high cost. In addition, some organic lithium salts have also been de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 周明杰王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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