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Manganese monoxide/graphene composite material used as negative electrode of lithium ion battery and preparation method of composite material

A lithium-ion battery and manganese monoxide technology, which is applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of undisclosed electrochemical performance and high cost, and achieve uniform shape and size, low cost, and ionic The effect of short diffusion channels

Active Publication Date: 2018-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method is strictly controlled, the cost is high, and its electrochemical performance is not disclosed

Method used

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  • Manganese monoxide/graphene composite material used as negative electrode of lithium ion battery and preparation method of composite material
  • Manganese monoxide/graphene composite material used as negative electrode of lithium ion battery and preparation method of composite material
  • Manganese monoxide/graphene composite material used as negative electrode of lithium ion battery and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Dissolve 1.5mmol manganese acetate and 0.1g polyvinylpyrrolidone in 50mL ethylene glycol solvent to obtain a mixed solution;

[0051] (2) The mixed solution obtained in step (1) was refluxed at 170°C for 6 hours, cooled to room temperature naturally, centrifuged at 8000r / min for 8 minutes, washed with ethanol for 4 times, and then placed at 80°C, Dry for 12 hours to obtain manganese alkoxide;

[0052] (3) The manganese alkoxide obtained in step (2) is heated from room temperature to 500 °C at a rate of 3 °C / min in an air atmosphere, calcined for 4 hours, and cooled to room temperature with the furnace to obtain a manganese monoxide precursor;

[0053] (4) Put 50 mg of the manganese monoxide precursor obtained in step (3) in 100 mL of graphene oxide aqueous solution with a mass concentration of 0.1 mg / mL, stir for 6 h, and freeze-dry for 48 h at -45 °C under a vacuum of 35 Pa to obtain black powder;

[0054] (5) Put 50 mg of the black powder obtained in step (4) in...

Embodiment 2

[0062] (1) Dissolve 4 mmol of manganese acetate and 0.3 g of cetyltrimethylammonium bromide in 100 mL of glycerol solvent to obtain a mixed solution;

[0063] (2) The mixed solution obtained in step (1) was refluxed at 160°C for 4 hours, cooled naturally to room temperature, centrifuged at 6000r / min for 8 minutes, washed with ethanol for 5 times, and then placed at 100°C, Dry for 8 hours to obtain manganese alkoxide;

[0064] (3) The manganese alkoxide obtained in step (2) is heated from room temperature to 600 °C at a rate of 1 °C / min in an air atmosphere, calcined for 5 hours, and cooled to room temperature with the furnace to obtain a manganese monoxide precursor;

[0065] (4) Put 50 mg of the manganese monoxide precursor obtained in step (3) in 100 mL of graphene oxide aqueous solution with a mass concentration of 0.05 mg / mL, stir for 8 h, and freeze-dry at -50 ° C and vacuum degree of 40 Pa for 40 h to obtain black powder;

[0066] (5) Put 50mg of the black powder obtai...

Embodiment 3

[0073] (1) Dissolve 7.5mmol manganese acetylacetonate and 0.45g polyvinylpyrrolidone in 150mL ethylene glycol solvent to obtain a mixed solution;

[0074] (2) The mixed solution obtained in step (1) was refluxed at 170°C for 5 hours, cooled naturally to room temperature, centrifuged at 6000r / min for 6 minutes, washed with ethanol for 4 times, and then dried at 80°C 12h, get manganese alkoxide;

[0075] (3) The manganese alkoxide obtained in step (2) is heated from room temperature to 500 °C at a rate of 5 °C / min in an air atmosphere, calcined for 4 hours, and cooled to room temperature with the furnace to obtain a manganese monoxide precursor;

[0076] (4) Put 50 mg of the manganese monoxide precursor obtained in step (3) in 100 mL of graphene oxide aqueous solution with a mass concentration of 0.1 mg / mL, stir for 6 h, and freeze-dry for 48 h at -45 °C under a vacuum of 35 Pa to obtain black powder;

[0077] (5) Put 50 mg of the black powder obtained in step (4) into a 20 mL...

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Abstract

The invention discloses a manganese monoxide / graphene composite material used as a negative electrode of a lithium ion battery and a preparation method of the composite material. The composite material is prepared by the steps of (1) dissolving a manganese source and a soft template into polyalcohol to obtain a mixed solution; (2) performing a backflow reaction, cooling, centrifuging, washing, anddrying to obtain manganese alcohol salt; (3) performing calcining and cooling to obtain a manganese monoxide precursor; (4) putting the precursor into a graphene oxide water solution, and performingstirring, freezing and drying to obtain blank powder; and (5) performing a reaction between hydrazine hydrate steam and the black powder, and then carrying out cooling, filtering, washing and drying.The composite material provided by the invention adopts a hollow structure; the granule surface is coated with graphene; the initial discharge capacity per gram can be as high as 1,065.1mAh / g at 0.01-3.00V and 70mA / g; the initial efficiency can reach 77.4%; the discharge specific capacity still can be 360mAh / g at 3,500mAh / g after 160 cycles; and the method is simple, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode composite material and a preparation method thereof, in particular to a lithium ion battery negative electrode manganese monoxide / graphene composite material and a preparation method thereof. Background technique [0002] With the development of science and technology and the popularization of various electronic products and electric vehicles, higher requirements are put forward for batteries as their energy sources. Lithium-ion batteries stand out due to their high energy density and environmental friendliness. At present, graphite is mainly used as the negative electrode material of lithium-ion batteries, but its capacity is low, the theoretical specific capacity is only 372mAh / g, and the cycle performance is poor, which restricts the development of lithium-ion batteries. [0003] Manganese oxide, a transition metal oxide, has become one of the optional materials for lithium-ion batte...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/366H01M4/502H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 童汇王旭张宝陈核章姚嬴赢郑俊超喻万景张佳峰郭志豪
Owner CENT SOUTH UNIV
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