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Pseudo-capacitor material polypyrrole-coated Fe2O3/Mn2O3 composite material and preparation method of polypyrrole-coated Fe2O3/Mn2O3 composite material

A technology of composite materials and polypyrrole, applied in nanotechnology, circuits, negative electrodes, etc. for materials and surface science, can solve the problems of low initial Coulombic efficiency, poor rate capability, fast capacity decay, etc., and achieve good cycle stability The effect of high stability, regular shape and high controllability

Inactive Publication Date: 2020-11-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large volume change and low conductivity during the charge-discharge cycle, the initial Coulombic efficiency is low, the rate capability is poor, and the capacity decays quickly.

Method used

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  • Pseudo-capacitor material polypyrrole-coated Fe2O3/Mn2O3 composite material and preparation method of polypyrrole-coated Fe2O3/Mn2O3 composite material
  • Pseudo-capacitor material polypyrrole-coated Fe2O3/Mn2O3 composite material and preparation method of polypyrrole-coated Fe2O3/Mn2O3 composite material
  • Pseudo-capacitor material polypyrrole-coated Fe2O3/Mn2O3 composite material and preparation method of polypyrrole-coated Fe2O3/Mn2O3 composite material

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Experimental program
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preparation example Construction

[0026] The invention provides a pseudocapacitance material polypyrrole-coated Fe 2 o 3 / Mn 2 o 3 The preparation method of composite material, comprises the following steps:

[0027] 1) Take 0.4~1.5g of MnSO 4 ·H 2 O and 0.3-1.8g of Fe(NO 3 ) 3 9H 2 O was dissolved in 30-70 mL of deionized water and stirred evenly to obtain a mixed solution, and the mixed solution was heated at a temperature of 120-180 °C for 12-24 hours to perform a hydrothermal reaction to obtain product A; that is, to control MnSO 4 ·H 2 O and Fe(NO 3 ) 3 9H 2 The molar ratio of O is: (1:1)-(5:1); preferably, the mixed solution is hydrothermally reacted in an autoclave, and the volume of the mixed solution is controlled not to exceed 70% of the volume of the autoclave.

[0028] 2) After washing and drying product A, heat at 500-1000°C for 3-8 hours for annealing treatment to obtain product B; product B is Fe 2 o 3 / Mn 2 o 3 nanoparticles;

[0029] 3) Put product B in 40-60 mL of p-toluenesu...

Embodiment 1

[0037] The preparation method comprises the following steps:

[0038] Step 1: Weigh 0.4g MnSO 4 ·H 2 O with 0.3g Fe(NO 3 ) 3 9H 2 O, measure 40mL of deionized water, prepare a mixed solution and heat it at 140°C for 18h for hydrothermal reaction;

[0039] Step 2: After washing and drying the product obtained in Step 1, heat it at 800° C. for 5 hours for annealing treatment;

[0040] Step 3: Place the product obtained in Step 2 in 40 mL of p-toluenesulfonic acid solution with a concentration of 0.3 mol / L and stir for 5 min, then add 20 uL of pyrrole solution and react at 5°C for 1 h;

[0041] Step 4: Pour off the supernatant of the product obtained from the reaction, then put the obtained precipitate into a centrifuge tube, wash it with deionized water first, then wash it with absolute ethanol, repeat 3 times in turn, and then put it in a drying box. Dry at 70°C for 7 hours to obtain Fe coated with polypyrrole, a pseudocapacitive material 2 o 3 / Mn 2 o 3 composite mat...

Embodiment 2

[0043] The preparation method comprises the following steps:

[0044] Step 1: Weigh 0.6g MnSO 4 ·H 2 O with 0.4g Fe(NO 3 ) 3 9H 2 O, measure 50mL of deionized water, prepare a mixed solution and heat it at 120°C for 12h for hydrothermal reaction;

[0045] Step 2: After washing and drying the product obtained in Step 1, heat it at 500° C. for 3 hours for annealing treatment;

[0046] Step 3: Put the product obtained in Step 2 in 50 mL of p-toluenesulfonic acid solution with a concentration of 0.15 mol / L and stir for 7 min, add 10 uL of pyrrole solution and react at 1°C for 3 h;

[0047] Step 4: Pour off the supernatant of the product obtained from the reaction, then put the obtained precipitate into a centrifuge tube, wash it with deionized water first, then wash it with absolute ethanol, repeat 3 times in turn, and then put it in a drying box. Dry at 60°C for 6h to obtain the pseudocapacitive material polypyrrole-coated Fe 2 o 3 / Mn 2 o 3 composite material.

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Abstract

The invention discloses a pseudo-capacitor material polypyrrole-coated Fe2O3 / Mn2O3 composite material and a preparation method of the polypyrrole-coated Fe2O3 / Mn2O3 composite material. The preparationmethod comprises the following steps of firstly, preparing Fe2O3 / Mn2O3 nanoparticles by utilizing a hydrothermal method, and then coating polypyrrole on the Fe2O3 / Mn2O3 nanoparticles by utilizing anSIP method so as to prepare the composite material. The composite material and the preparation method are simple in technological process and are convenient, pollution-free and environment-friendly, the prepared composite material is high in purity, good in dispersity, high in controllability and regular in morphology, is metal-skeleton-shaped cubic particles, can establish a channel for rapidly transporting lithium ions, effectively relieves volume expansion of active substances in the charging and discharging process and improves the cycling stability. The polypyrrole coated layer effectively alleviates the larger volume change of the transition metal oxide in the charging and discharging process, and prevents the composite material structure from being destroyed and losing activity, sothat the composite material has higher charging and discharging capacity, and has good electrochemical performances as a lithium ion battery anode material.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials, in particular to Fe coated with polypyrrole, a pseudocapacitive material. 2 o 3 / Mn 2 o 3 Composite materials and methods for their preparation. Background technique [0002] Lithium-ion batteries (LIBs) have become the main energy storage devices in fields such as portable electronics and electric vehicles due to their excellent electrochemical performance. However, with the continuous development of battery technology, the requirements for its energy density are getting higher and higher. The traditional commercial graphite anode material has a relatively low specific capacity (372mAh g -1 ) has been difficult to meet the rapid development of LIBs capacity demand. Therefore, the development of a new generation of anode materials with high energy density and high cycle stability is an inevitable trend in the development of LIBs. [0003] Transition metal oxides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/502H01M4/523H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 方园李腾飞王芬朱建锋张婷婷
Owner SHAANXI UNIV OF SCI & TECH
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