Preparation method of porous carbon coated MnO nanocrystalline composite material and application of porous carbon coated MnO nanocrystalline composite material in lithium battery

A technology of composite materials and porous carbon, applied in the direction of lithium batteries, nanotechnology for materials and surface science, battery electrodes, etc., can solve the problem of high cost of commercial application of MnO composite materials, unfavorable commercial promotion, complicated preparation methods, etc. problems, to achieve the effect of more lithium storage active sites, shortening the diffusion distance, and simplifying the process steps

Inactive Publication Date: 2017-11-24
ANQING NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, the preparation method for the synthesis of porous carbon-coated MnO nanocrystalline composites reported so far is complicated. People often use a two-step method to prepare carbon-coated MnO composites, that is, the first step is to prepare MnO, and then the pre-prepared MnO carbon coating
This preparation method is not only complicated, but also time-consuming, which seriously hinders the commercial application of carbon-coated MnO composites and is expensive, which is not conducive to commercial promotion.

Method used

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  • Preparation method of porous carbon coated MnO nanocrystalline composite material and application of porous carbon coated MnO nanocrystalline composite material in lithium battery
  • Preparation method of porous carbon coated MnO nanocrystalline composite material and application of porous carbon coated MnO nanocrystalline composite material in lithium battery
  • Preparation method of porous carbon coated MnO nanocrystalline composite material and application of porous carbon coated MnO nanocrystalline composite material in lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Preparation and determination of precursor Mn-BTC microspheres

[0036] At room temperature at 25°C, 20 mL containing 180 mg trimesic acid (C 9 o 6 h 6 ) of ethanol and water (volume ratio of 1:1) was dropped into 20mL containing 98mg of manganese acetate tetrahydrate (Mn(CH 3 COO)·4H 2 (2) and 0.6g polyvinylpyrrolidone (PVP) in the mixed solution of ethanol and water (volume ratio is 1:1), leave standstill 24 hours after stirring evenly, centrifugal separation, obtain precursor Mn-BTC microsphere (manganese ion complexes with trimesic acid).

[0037] The precursor was analyzed by infrared spectroscopic analysis and thermogravimetric analysis under nitrogen, and the analysis results were as follows: figure 1 shown. from figure 1 It can be seen from the infrared spectrum of a that at 1560, 1440 and 1380cm-1 The three peaks appearing at can be attributed to COO in trimesic acid - with Mn 2+ Bonds were formed, indicating successful preparation of the co...

Embodiment 2

[0038] Example 2: Preparation and determination of porous carbon-coated MnO nanocrystalline composites

[0039] Place the precursor obtained in Implementation 1 in a tube-type crucible furnace, heat up to 600°C at a rate of 10°C / min in a nitrogen atmosphere; then calcinate at this temperature for 2 hours, and cool naturally to 25°C at room temperature to obtain Porous carbon-coated MnO nanocrystalline composites.

[0040] The chemical composition of the calcined product can be determined by X-ray diffraction. X-ray diffraction of the resulting product Figure such as image 3 shown. from image 3 It can be seen that the X-ray diffraction peaks of the obtained product are consistent with the standard JCPDS card No. 75-0626, indicating that the obtained sample contains MnO phase. The resulting product was further analyzed by Raman spectroscopy, and the analysis results were as follows: Figure 4 shown. from Figure 4 As can be seen in , at 1350 and 1585cm -1 There are t...

Embodiment 3

[0041] Example 3: Application of carbon-coated MnO nanocrystalline composites in lithium batteries

[0042] The carbon-coated MnO nanocrystalline composite material obtained at the calcination temperature at a heating rate of 10°C / min, acetylene black, and polyvinylidene fluoride PVDF were mixed at a mass ratio of 8:1:1 to form a slurry. The above mud-like substance is evenly coated on the copper foil, and after drying in an oven at 80°C, the copper foil is cut into discs with a diameter of 10-15mm, which is the MnO nanocrystalline composite material loaded with porous carbon. Electrode sheet: the electrode sheet loaded with carbon-coated MnO nanocrystalline composite material is the positive electrode, the circular metal lithium sheet with a diameter of 14 mm is the negative electrode, and the electrode sheet is composed of ethylene carbonate EC and diethyl carbonate DEC according to the mass ratio 1:1 mixed composition, containing lithium hexafluorophosphate LiPF at a concen...

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Abstract

The invention discloses a preparation method of a porous carbon coated MnO nanocrystalline composite material. The method comprises the following steps: (a1) in a temperature environment of 20-25DEG C, dripping mixed solution of ethyl alcohol of trimesic acid and water into a mixed solution of manganese acetate tetrahydrate, ethyl alcohol of polyvinylpyrrolidone and water, stirring evenly, standing for 20-30h, and carrying out centrifugalization to obtain a precursor Mn-BTC micro-sphere; (a2) putting the precursor Mn-BTC micro-sphere into a tube-type crucible furnace, raising the temperature to 500-700DEG C at a rate of 7-13DEG C/min in inert gas, then, calcining at the temperature for 1-3h, and naturally cooling to 20-25DEG C to obtain the porous carbon coated MnO nanocrystalline composite material. The preparation method has the advantages that a complex is directly calcined in nitrogen to prepare the carbon coated MnO composite material, and technical steps for preparing the carbon coated MnO composite material are effectively simplified. In addition, the preparation method has the advantages of simple and efficient preparation technology, safety, easiness in realization and short synthesis period, and is hopefully subjected to popularization and industrial production.

Description

technical field [0001] The invention relates to the technical field of nanocomposite material preparation, and more specifically relates to a method for preparing a porous carbon-coated MnO nanocrystalline composite material and its application in lithium batteries. Background technique [0002] Due to its high energy density and power density, lithium batteries are widely used in mobile energy storage devices for electric vehicles and electronic products. When choosing the negative electrode material of lithium battery, compared with traditional graphite, transition metal oxides have attracted extensive attention of scientific and technological workers because of their higher theoretical specific capacity. Among many transition metal oxides, the theoretical specific capacity of MnO reaches 756mAh g -1 , and is abundant on the earth, the price is low, and there is no harm to the environment. In addition, MnO has high output voltage and low operating voltage, which can meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/625H01M10/052Y02E60/10
Inventor 郑方才
Owner ANQING NORMAL UNIV
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