Carbon-coated porous manganese monoxide composite material and preparation method and application thereof

A manganese monoxide and composite material technology, applied in electrochemical generators, structural parts, electrical components, etc., can solve the problems of further increase in capacity and rapid loss, achieve good cycle stability, inhibit volume damage, prevent growing effect

Active Publication Date: 2016-06-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as MnO/Ccore–shellnanorodshighcapacityanodematerialsforlithium-ionbatteries MnO 2 Nanowires were used as precursors, and MnO/C core-shell nanorods were prepared by in situ reduction method with F127 as carbon source. -1 The secondary cycle capacity is 800mAhg at the current density -1 , compared to MnO 2 The nanowire is greatly improved, but the loss is faster, and the specific capacity is only 75% after 40 cycles
The literature Green and facilefabrication o

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  • Carbon-coated porous manganese monoxide composite material and preparation method and application thereof
  • Carbon-coated porous manganese monoxide composite material and preparation method and application thereof
  • Carbon-coated porous manganese monoxide composite material and preparation method and application thereof

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Embodiment 1

[0033] A novel carbon-coated porous manganese monoxide core-shell composite material and its preparation method

[0034] 1. Dissolve 10mL styrene in 200mL ethanol, keep the 2After stirring for 30 min, the temperature was raised to 70°C and stabilized for 1 h to obtain solution Ⅰ.

[0035] 2. Take 0.273g of potassium persulfate into a 20mL volumetric flask, and slowly drop the potassium persulfate solution into solution Ⅰ. 2 The reaction was stirred at 70° C. for 12 h, cooled to room temperature, washed, and the solid reaction product was collected to obtain product I.

[0036] 3. Take 2g of product I, disperse it in 40mL of concentrated sulfuric acid by ultrasonic dispersion, and stir and react at 40°C for 3 hours. After the reaction is completed, add it to 100mL of water, let it stand and separate and wash , the solid product was collected to give product II.

[0037] 4. Disperse 0.5g of product II in 250mL of water, ultrasonically disperse for 30min, then slowly add 25mL ...

Embodiment 2

[0049] 1. Dissolve 20mL styrene in 300mL ethanol, keep the N 2 After stirring for 30 min, the temperature was raised to 70°C and stabilized for 2 h to obtain solution Ⅰ.

[0050] 2. Take 0.546g of potassium persulfate into a 20mL volumetric flask, and slowly drop the potassium persulfate solution into solution Ⅰ. 2 The reaction was stirred at 70° C. for 18 h, cooled to room temperature, washed, and the solid reaction product was collected to obtain product I.

[0051] 3. Take 3g of product I, disperse it in 75mL of concentrated sulfuric acid by ultrasonic dispersion, and stir and react at 40°C for 2 hours. After the reaction is completed, add it to 150mL of water, let it stand and separate and wash , the solid product was collected to give product II.

[0052] 4. Disperse 1g of product II in 280mL of water, ultrasonically disperse for 60min, then slowly add 35mL of ethanol, after complete dispersion, slowly add 230mL of 0.04MMnSO 4 solution and 0.4MNH 4 CO 3 solution, kep...

Embodiment 3

[0058] 1. Dissolve 20mL styrene in 400mL ethanol, keep stirring with helium for 60min, then raise the temperature to 70°C and stabilize for 1.5h to obtain solution Ⅰ.

[0059] 2. Take 0.546g of potassium persulfate into a 20mL volumetric flask, slowly drop the potassium persulfate solution into Solution I, stir and react for 24h in a helium atmosphere at 70°C, cool to room temperature, wash, and collect the solid reaction product. Product I is obtained.

[0060] 3. Take 4g of product I, disperse it in 120mL of concentrated sulfuric acid by ultrasonic dispersion, and stir and react at 40°C for 4 hours. After the reaction is completed, add it to 300mL of water, let it stand for separation and wash , the solid product was collected to give product II.

[0061] 4. Disperse 2g of product II in 300mL of water, ultrasonically disperse for 45min, then slowly add 50mL of ethanol, after complete dispersion, slowly add 250mL of 0.06MMnSO 4 solution and 0.6MNH 4 CO 3 Solution, keep st...

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Abstract

The invention discloses a carbon-coated porous manganese monoxide core-shell structure composite material and a preparation method and an application thereof. The preparation method comprises the following steps: firstly, with styrene as a carbon source and potassium peroxodisulfate as an initiator, carrying out soap-free emulsion polymerization to obtain a polystyrene microsphere template, and then carrying out surface modification on microspheres with concentrated sulfuric acid; with common manganese sulfate as a manganese source, preparing manganese carbonate particles embedded with a plurality of polystyrene microspheres by a liquid phase deposition method, and then adding a shell layer material to coat the particle surfaces with a carbon layer; and finally, carrying out high-temperature carbonization to obtain a novel carbon-coated porous manganese monoxide core-shell structure composite material. The composite material is spherical particles with uneven surfaces; and the spherical particles comprise manganese monoxide grains, multi-scale holes and the carbon layer. The special structure with the carbon layer and the multi-scale holes can play a role in buffering volume expansion of manganese monoxide in the repeated charging and discharging processes. The composite material disclosed by the invention has excellent cycling stability and rate capability as an anode material for a lithium-ion battery.

Description

technical field [0001] The invention relates to a preparation method of a novel carbon-coated porous manganese monoxide core-shell structure composite material and its application as a lithium-ion battery negative electrode material. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, lithium-ion batteries have occupied an important position in the electronic commodity market. Today, with the development of technology, various electronic products, such as mobile phones, notebook computers, digital cameras and tablet computers are increasingly miniaturized and lightweight. Therefore, new batteries with high efficiency and small size have become people's pursuit. In short, lithium-ion secondary batteries with high capacity, long life and fast charging and discharging have become a research hotspot for researchers. Electrode materials are one of the core components of lithium-ion batteries, which play a decisive role in battery per...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525
CPCH01M4/366H01M4/502H01M4/625H01M10/0525Y02E60/10
Inventor 隋刚汤雪梅张洒洒方群杨小平
Owner BEIJING UNIV OF CHEM TECH
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