Nitrogen-doped carbon-clad manganese oxide lithium ion battery composite cathode material, and preparation method and application of composite cathode material

A manganese oxide lithium, ion battery technology, applied in the field of electrochemistry, can solve the problems of poor electrical conductivity and cycle stability, and achieve the effects of improving cycle performance and rate performance, good stability, and increasing electrical conductivity

Active Publication Date: 2017-11-21
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the current traditional transition metal oxide lithium-ion battery negative electrode materials such as poor conductivity and cycle stability, the present invention provides a nitrogen-doped carbon-coated manganese oxide (MnO@NC) l

Method used

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  • Nitrogen-doped carbon-clad manganese oxide lithium ion battery composite cathode material, and preparation method and application of composite cathode material
  • Nitrogen-doped carbon-clad manganese oxide lithium ion battery composite cathode material, and preparation method and application of composite cathode material
  • Nitrogen-doped carbon-clad manganese oxide lithium ion battery composite cathode material, and preparation method and application of composite cathode material

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Embodiment 1

[0040] (1) Weigh 1mmol of manganese acetate and 10mmol of ammonium bicarbonate and dissolve them in 30mL of ethylene glycol, and stir at room temperature for 30min to obtain a uniformly mixed solution; transfer the solution obtained above to a 50mL reaction kettle, and The hydrothermal reaction was carried out at 180°C for 12 hours; the hydrothermal reaction product was centrifuged, washed 4 times with water and absolute ethanol, and then dried in a vacuum oven at 80°C to obtain the precursor nanosphere manganese carbonate particles; then , to coat dopamine, the process is as follows: Weigh 100 mg of nanosphere manganese carbonate and 100 mg of dopamine hydrochloride respectively, dissolve them in 50 mL of Tris buffer solution (pH=8.5), stir at room temperature for 24 hours, and centrifuge and wash with absolute ethanol 4 times and dried to obtain the manganese carbonate@polydopamine complex. Finally, the obtained manganese carbonate@polydopamine complex was placed in a porcel...

Embodiment 2

[0043] (1) Dissolve 1 mmol of manganese nitrate and 5 mmol of ammonium bicarbonate in 30 mL of absolute ethanol, and stir at room temperature for 30 minutes to obtain a uniformly mixed solution; transfer the above obtained solution to a 50 mL reaction kettle, Carry out hydrothermal reaction at 150°C for 10 hours; centrifuge the hydrothermal reaction product, wash it with water and absolute ethanol for 4 times, and dry it in a vacuum oven at 80°C to obtain the precursor nanosphere manganese carbonate particles; Subsequently, the coating of dopamine was carried out as follows: 100 mg of nanosphere manganese carbonate and 150 mg of dopamine hydrochloride were weighed, dissolved in 50 mL of Tris buffer solution (pH=8.5), stirred at room temperature for 24 hours, and centrifuged with absolute ethanol Washed 4 times and dried to obtain the product manganese carbonate@polydopamine complex. Finally, the obtained manganese carbonate@polydopamine complex was placed in a porcelain boat a...

Embodiment 3

[0046] (1) Weigh 1mmol of manganese sulfate and 15mmol of ammonium bicarbonate and dissolve them in 30mL of deionized water, stir at room temperature for 30min to obtain a uniformly mixed solution; The hydrothermal reaction was carried out at ℃ for 15 hours; the hydrothermal reaction product was centrifuged, washed 4 times with deionized water and absolute ethanol, and then dried in a vacuum oven at 80 ℃ to obtain the precursor nanosphere manganese carbonate Particles; then, dopamine coating, the process is as follows: Weigh 100mg of nanosphere manganese carbonate and 125mg of dopamine hydrochloride respectively, dissolve in 50 mL of Tris buffer solution (pH=8.5), stir at room temperature for 24h, wash with anhydrous Washed by ethanol centrifugation for 4 times and dried to obtain the product manganese carbonate@polydopamine complex. Finally, the obtained manganese carbonate@polydopamine complex was placed in a porcelain boat and placed in a tube furnace. Under the protection ...

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Abstract

The invention discloses a nitrogen-doped carbon-clad manganese oxide lithium ion battery composite cathode material, and a preparation method and an application of the composite cathode material. The composite material is composited by nanoscale manganese oxide and dopamine, wherein manganese oxide is spherical. The method comprises the steps of mixing a prepared spherical manganese oxide nano particle and dopamine hydrochloride, performing filtering, washing and drying to obtain a manganese oxide and polydopamine composite, and then converting a polymerization layer into a nitrogen-doped carbon layer by high-temperature carbonization. The prepared nitrogen-doped carbon-clad manganese oxide (MnO@NC) lithium ion battery composite cathode material is stable in structure and good in conductivity, and has excellent rate capability and cycling stability as a lithium ion battery cathode material; and polymerization of the dopamine is only completed at a room temperature and under a slightly alkaline condition, so that the composite cathode material is low in cost, low in energy consumption, convenient to control and environment-friendly, is suitable for a practical application of a lithium ion battery, and can realize industrial mass production.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and specifically relates to a nitrogen-doped carbon-coated manganese oxide lithium-ion battery composite negative electrode material and a preparation method and application thereof. Background technique [0002] The three major themes of science and technology development in the 21st century are energy, environment and information, among which the lack of energy and serious environmental pollution have become two major problems that need to be solved urgently. In order to deal with the above two problems, people are committed to developing new green and clean energy such as solar energy, wind energy and tidal energy, so as to gradually replace non-renewable and environmentally polluting fossil fuels. However, most of the clean energy that has been utilized is uncontrollable and intermittent, which increases the cost of energy storage and management, thus prompting people to conduct a lot of resea...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/366H01M4/50H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 蒋仲杰秦艳敏
Owner SOUTH CHINA UNIV OF TECH
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