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Graphene lithium salt, preparation method thereof, positive electrode and supercapacitor

A technology of graphene and lithium salt, which is applied in the direction of electrolytic capacitors, capacitors, battery electrodes, etc., can solve the problems of complex process, low cycle life, poor mechanical properties, etc., and achieve the effect of low preparation cost and simple operation

Active Publication Date: 2013-09-11
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

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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  • Graphene lithium salt, preparation method thereof, positive electrode and supercapacitor
  • Graphene lithium salt, preparation method thereof, positive electrode and supercapacitor
  • Graphene lithium salt, preparation method thereof, positive electrode and supercapacitor

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preparation example Construction

[0027] The preparation method of a kind of graphene lithium salt that this specific embodiment provides, such as figure 1 shown, including the following steps:

[0028] S1. Add graphite oxide into a reactor (for example, a three-neck flask) containing lithium methylate and methanol, and ultrasonically stir the reaction at room temperature for 1-12 hours, filter off excess methanol and lithium methylate, and dry the filtrate to obtain graphene oxide Derivative lithium salt; wherein, the mass ratio of graphite oxide to lithium methylate is 15:7, and in every 10ml of methanol, the amount of graphite oxide added is 30mg;

[0029] The reaction mechanism is: lithium methoxide reduces the carbonyl in graphene oxide carbonyl to form methanol and graphene lithium salt;

[0030] S2. React the lithium salt of the graphene oxide derivative with ethylene oxide at 80-150° C. and 0.2-0.5 MPa for 1-10 hours, then evaporate and remove excess ethylene oxide to obtain graphene oxide rings Lith...

Embodiment 1

[0051] The technical process that the present invention prepares graphite oxide is as follows:

[0052] (1) Graphite: 99.5% purity.

[0053] (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.

[0054] (3) Graphite oxide derivative lithium salt: put 30mg of ...

Embodiment 2

[0058] The technical process that the present invention prepares graphite oxide is as follows:

[0059] (1) Graphite: 99.5% purity.

[0060] (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.

[0061] (3) Graphite oxide derivative lithium salt: put 90mg of ...

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Abstract

The invention belongs to the field of lithium battery materials, and discloses graphene lithium salt, a preparation method thereof, a positive electrode and a supercapacitor. The graphene lithium salt has the structural formula shown in the specification. The graphene lithium salt provided by the invention has good electrical conductivity, a high mechanical property, high power density and a long cycle life, the material has good interfacial compatibility, meanwhile, multiple derivatization manners of graphene enables the graphene lithium salt to have high capacity, and the graphene is utilized as a positive material of the supercapacitor.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a graphene lithium salt and a preparation method thereof. The invention also relates to a positive electrode using graphene lithium salt as the positive active material. The invention also relates to a supercapacitor using the positive electrode as the positive pole of the capacitor. 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 capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M4/60H01G9/042
CPCY02E60/10Y02E60/13
Inventor 周明杰王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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