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porous fe 2 o 3 Nanowire material and its preparation method and application

A nanowire and fe2o3 technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of increased irreversible capacity of electrode materials, decreased Coulombic efficiency, and large number of SEIs, etc., to improve cycle stability, increase transport capacity, and reduce diffusion paths Effect

Active Publication Date: 2017-02-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large amount of unstable SEI formed by nanomaterials, the irreversible capacity of the electrode material increases and the Coulombic efficiency decreases.

Method used

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  • porous fe <sub>2</sub> o <sub>3</sub> Nanowire material and its preparation method and application
  • porous fe <sub>2</sub> o <sub>3</sub> Nanowire material and its preparation method and application
  • porous fe <sub>2</sub> o <sub>3</sub> Nanowire material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0027] Porous Fe 2 o 3 A preparation method for a nanowire material, comprising the steps of:

[0028] 1) Prepare MnOOH by hydrothermal method, take 0.18g MnOOH and dissolve in distilled water, stir and ultrasonically dissolve, add 40mL of ethanol;

[0029] 2) Take 0.83g FeSO 4 ·7H 2 O and 0.10 g KNO 3 , and configured into a solution;

[0030] 3) Add the solution obtained in step 2) dropwise to the solution obtained in step 1), stir in a water bath at 40°C for 12 hours, let stand, and centrifuge the precipitate to obtain an orange solid;

[0031] 4) Put the orange solid obtained in step 3) into a muffle furnace for sintering at 800°C for 5 hours to obtain porous Fe 2 o 3 nanowire material.

[0032] With this embodiment product porous Fe 2 o 3 Taking the nanowire material as an example, its structure was determined by X-ray diffractometer. attached figure 1 The shown X-ray diffraction pattern (XRD) shows that the porous Fe 2 o 3 Nanowire material and Fe 2 o 3 T...

Embodiment 2

[0037] 1) Prepare MnOOH by hydrothermal method, dissolve 0.30g MnOOH in distilled water, stir and ultrasonically dissolve, add 40mL of ethanol;

[0038] 2) Take 0.83g FeSO 4 ·7H 2 O and 0.10 g KNO 3 , and configured into a solution;

[0039] 3) Add the solution obtained in step 2) dropwise to the solution obtained in step 1), stir in a water bath at 30°C for 12 hours, let stand, and centrifuge the precipitate to obtain an orange solid;

[0040] 4) Put the orange solid obtained in step 3) into a muffle furnace for sintering at 750°C for 5 hours to obtain porous Fe 2 o 3 nanowire material.

[0041] With the porous Fe obtained in this embodiment 2 o 3 Taking nanowire material as an example, at a current density of 5A / g, the initial discharge capacity of the material is 1138mAh / g, and the discharge capacity after 650 cycles can still reach 651mAh / g, and the capacity retention rate is 57.2%.

Embodiment 3

[0043] 1) Prepare MnOOH by hydrothermal method, take 0.20g MnOOH and dissolve in distilled water, stir and ultrasonically dissolve, add 50mL of ethanol;

[0044] 2) Take 0.83g FeSO 4 ·7H 2 O and 0.10 g KNO 3 , and configured into a solution;

[0045] 3) Add the solution obtained in step 2) dropwise to the solution obtained in step 1), stir in a water bath at 40°C for 16 hours, let stand, and centrifuge the precipitate to obtain an orange solid;

[0046] 4) Put the orange solid obtained in step 3) into a muffle furnace for sintering at 800°C for 6 hours to obtain porous Fe 2 o 3 nanowire material.

[0047] With the porous Fe obtained in this embodiment 2 o 3 Taking nanowire material as an example, at a current density of 5A / g, the initial discharge capacity of the material is 1081mAh / g, and after 650 cycles, the discharge capacity can still reach 604mAh / g, and the capacity retention rate is 55.8%.

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Abstract

The invention relates to a porous Fe2O3 nano wire material, as well as a preparation method and application of the porous Fe2O3 nano wire material. The porous Fe2O3 nano wire material has the characteristics that the length is 5-20 microns, the diameter of a nano wire is 80-200nm, the inner part has a porous structure, and the hole diameter is 20-40nm. The porous Fe2O3 nano wire material has the beneficial effects that the porous Fe2O3 nano wire material is prepared by taking an MnOOH nano wire as a hard template, carrying out oxidation-reduction reaction to prepare an Fe(OH)x precursor nano tube and combining a solid phase sintering method; the porous Fe2O3 nano wire material has the characteristics of high capacity and good cycle stability when being taken as the negative electrode active material of a lithium ion battery; the structure stability is good, and the electrochemical performance of the material can be sufficiently developed; due to the construction of the porous Fe2O3 nano wire material, the ion / electron transportation capability of the material can be effectively improved, the diffusion path can be shortened, the ion / electron diffusion speed rate is increased, and finally, the porous Fe2O3 nano wire material can be applied to the field of electrode materials with high power and long service lives.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to porous Fe 2 o 3 Nanowire materials and their preparation methods and applications. Background technique [0002] Today, with the rapid development of pure electric vehicles, hybrid vehicles, and large-scale energy storage devices, energy storage devices such as lithium ions with high energy density, high power density, and long cycle life have attracted extensive attention from researchers. It is evident that the performance of high-performance Li-ion batteries depends on the electrode materials. The capacity of traditional carbon-based anode materials is low (theoretical capacity is 372mA h g -1 ), and its safety factor is not too high. In order to meet the growing demand, a series of transition metal oxides (MO x , M: Fe, Co, Ni, Cu, etc.) due to the advantages of high capacity (>600mA h g -1 ) has been widely studied, and cobalt oxide is one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/131H01M4/1391B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/131H01M4/1391H01M4/52H01M2220/20Y02E60/10
Inventor 麦立强温明英郭海长赵康宁
Owner WUHAN UNIV OF TECH