A preparation method of a double-carbon layer coated manganese oxide composite material

A technology of composite materials and manganese oxide, which is applied in nanotechnology, electrochemical generators, electrical components, etc. for materials and surface science. The effect of loss of active substances, wide range of raw material sources, and low cost

Active Publication Date: 2019-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods usually have complex synthesis processes, and some of the required raw materials are expensive, involve a long time-consuming process, and are difficult to control the structure of the product

Method used

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  • A preparation method of a double-carbon layer coated manganese oxide composite material
  • A preparation method of a double-carbon layer coated manganese oxide composite material
  • A preparation method of a double-carbon layer coated manganese oxide composite material

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Embodiment 1

[0048] A kind of preparation method of double carbon layer coated manganese oxide composite material of the present invention, comprises the following steps:

[0049] (1) Take 2mmol MnSO 4 Add 40ml ethanol and 40ml deionized water mixed solution, 10mmol NH 4 HCO 3 Add 40ml of deionized water, mix the two together and stir for 3 hours to carry out co-precipitation reaction. The reaction product is filtered, washed, and dried in a vacuum oven at 120°C for 6 hours to obtain spherical manganese carbonate;

[0050] (2) Take 1g of spherical manganese carbonate and put it into a mixed solution of 100ml of deionized water and 100ml of absolute ethanol. After being uniformly dispersed by ultrasonic waves, add 5g of glucose, stir for 10h, dry in a vacuum oven at 120°C for 10h, and place In a tube furnace, raise the temperature to 400°C at a rate of 2°C / min in an argon atmosphere and keep it warm for 10 hours, and take it out after cooling to room temperature to obtain a precursor;

...

Embodiment 2

[0055] A kind of preparation method of double carbon layer coated manganese oxide composite material of the present invention, comprises the following steps:

[0056] (1) Take 2mmol MnSO 4 Add 40ml ethanol and 40ml deionized water mixed solution, 20mmol NH 4 HCO 3 Add 40ml of deionized water, mix the two together and stir for 8 hours to carry out co-precipitation reaction. The reaction product is filtered, washed, and dried in a vacuum oven at 105°C for 12 hours to obtain spherical manganese carbonate;

[0057] (2) Take 1g of spherical manganese carbonate and put it into a mixed solution of 100ml of deionized water and 100ml of absolute ethanol. After being uniformly dispersed by ultrasonic waves, add 1g of glucose, stir for 24h, dry in a vacuum oven at 105°C for 20h, and place In a tube furnace, raise the temperature up to 500°C at a rate of 5°C / min in an argon atmosphere and keep it warm for 6 hours, and take it out after cooling to room temperature to obtain a precursor; ...

Embodiment 3

[0062] A kind of preparation method of double carbon layer coated manganese oxide composite material of the present invention, comprises the following steps:

[0063] (1) Take 2mmol MnSO 4 Add 40ml ethanol and 40ml deionized water mixed solution, 16mmol NH 4 HCO 3 Add 40ml of deionized water, mix the two together and stir for 5 hours to carry out co-precipitation reaction. The reaction product is filtered, washed, and dried in a vacuum oven at 110°C for 8 hours to obtain spherical manganese carbonate;

[0064] (2) Take 1g of spherical manganese carbonate and put it into a mixed solution of 100ml of deionized water and 100ml of absolute ethanol. After being dispersed evenly by ultrasonic waves, add 3g of glucose, stir for 18h, dry in a vacuum oven at 110°C for 15h, and place In a tube furnace, raise the temperature to 450°C at a rate of 3°C / min in an argon atmosphere and keep it for 8 hours, and take it out after cooling to room temperature to obtain a precursor;

[0065] (3...

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Abstract

The invention discloses a preparation method of a double-carbon layer coated manganese oxide composite material, belonging to the field of lithium ion battery negative electrode materials, comprisingthe following steps: adopting a coprecipitation method to synthesize spherical manganese carbonate, coating a layer of carbon source on the surface of the spherical manganese carbonate, and carrying out sintering treatment in an inert atmosphere to obtain a precursor; The precursor is put into hydrochloric acid solution, dispersed uniformly, and then the precursor is coated with a carbon source under vacuum, and then heat treated in an inert atmosphere to obtain a double carbon layer coated manganese oxide composite material. As that nanometer manganese oxide particles are prepared by heat treat manganese carbonate in a specific atmosphere and temperature, the nanometer material can alleviate the problems of poor conductivity and volume expansion of the manganese oxide negative electrode material and improve the electrochemical performance of the negative electrode material; The invention uses two layers of carbon as a protective layer to reduce the loss of the active material caused by the manganese oxide in the long-term circulation process, while alleviating the volume expansion in the lithium removal and intercalation process, and improving the electrochemical performance of the composite material.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and relates to a preparation method of a double-carbon layer-coated manganese oxide composite material. Background technique [0002] As a new type of energy storage element, lithium-ion battery has the advantages of high energy density, long cycle life, high operating voltage, no memory effect, small self-discharge, wide operating temperature range, and green environmental protection. It has been widely used in mobile phones, In portable mobile devices such as notebook computers, it has good development potential in electric vehicles, aerospace, smart grid and other fields. With the continuous progress of science and technology, the demand for lithium-ion batteries is also increasing. One of the key factors in battery performance. Therefore, it is necessary to develop new anode materials for lithium-ion batteries with excellent performance. [0003] At pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/502H01M4/628H01M10/0525Y02E60/10
Inventor 唐晶晶杨娟周向阳程芳燕孙安涛蒋敏
Owner CENT SOUTH UNIV
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