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Porous ferric oxide/carbon nanometer plate composite material as well as preparation method thereof and application in preparing lithium ion battery

A technology for ferric oxide and lithium ion batteries, applied in the field of lithium ion batteries, can solve the problems of low theoretical capacity, poor cycle stability, low electronic conductivity, etc., achieve high volume specific capacity and volume energy density, and low preparation cost , the effect of high specific capacity

Active Publication Date: 2014-03-26
江苏海四达电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Fe2O3 as a lithium-ion battery anode material has a theoretical capacity of 1007 mAh / g, which is about 2.7 times that of graphite anode materials. In addition, it also has the advantages of low cost, abundant raw material sources, safety and environmental protection. It is a very promising anode material for lithium-ion batteries. Large volume change leads to particle pulverization, so its cycle stability is poor, far below its theoretical capacity

Method used

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  • Porous ferric oxide/carbon nanometer plate composite material as well as preparation method thereof and application in preparing lithium ion battery
  • Porous ferric oxide/carbon nanometer plate composite material as well as preparation method thereof and application in preparing lithium ion battery
  • Porous ferric oxide/carbon nanometer plate composite material as well as preparation method thereof and application in preparing lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] After manually grinding ferrocene and ammonium sulfate with a mass ratio of 1:1, the mixture was put into a reaction kettle in an argon-filled glove box, and the reaction kettle was heated to 550 °C for 3 h. The black product in the reaction kettle was taken out and transferred to a tube furnace to be heated to 350 °C and kept for 1 h to obtain porous Fe2O3 / carbon nanosheet composites.

[0043] Preparation of the negative electrode: Using N-methyl-pyrrolidone (NMP) as the solvent, mix the above-mentioned nanosheets with the conductive agent acetylene black and the binder polyvinylidene fluoride (PVDF) according to the mass ratio of 8:1:1. Coated on the current collector, then dried at 120°C, rolled and formed after drying, and cut into pieces to obtain negative electrodes of required size.

[0044] Preparation of lithium-ion batteries: Add lithium iron phosphate, conductive agent acetylene black, and polyvinylidene fluoride (PVDF) with a weight ratio of 8:1:1 to N-methy...

Embodiment 2

[0048] After mechanically grinding ferrocene and ammonium sulfate with a mass ratio of 1:1.5, the mixture was put into a reaction kettle in a glove box filled with nitrogen, and the reaction kettle was heated to 550° C. for 3 hours. The black product in the reaction kettle was taken out and transferred to a tube furnace to be heated to 350 °C and kept for 1 h to obtain porous Fe2O3 / carbon nanosheet composites. Using the material obtained in this example as the negative electrode material, the same method as in Example 1 was used to prepare the lithium ion battery negative electrode and the lithium ion battery.

Embodiment 3

[0050] After mechanically stirring ferrocene and ammonium sulfate with a mass ratio of 1:0.5, the mixture was put into a reaction kettle in an argon-filled glove box, and the reaction kettle was heated to 550° C. for 1 hour. The black product in the reaction kettle was taken out and transferred to a tube furnace to be heated to 300 °C and kept for 0.5 h to obtain a porous ferric oxide / carbon nanosheet composite. Using the composite material obtained in this example as the negative electrode material, the same method as in Example 1 was used to prepare the lithium ion battery negative electrode and the lithium ion battery.

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Abstract

The invention relates to a porous ferric oxide / carbon nanometer plate composite material as well as a preparation method of the porous ferric oxide / carbon nanometer plate composite material and application in preparing a lithium ion battery. The method comprises the following steps of uniformly mixing raw materials including ferrocene and ammonium sulfate in a given mass ratio; calcining the mixture in an inert gas high-pressure reaction kettle, then calcining the mixture in the air at a low temperature to obtain the porous ferric oxide / carbon nanometer plate composite material. The preparation method is simple in process, easy to operate, high in yield and applicable to the mass production. When being used as a lithium ion battery cathode material, the prepared porous ferric oxide / carbon nanometer plate composite material is high in specific capacity and excellent in circulation stability, and the capacity of the material is more than 1000mAh / g after being circulated for 100 times.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a porous ferric oxide / carbon nanosheet composite material, a preparation method thereof, a negative electrode material using the material, and a lithium-ion battery. Background technique [0002] In the past ten years, portable mobile electronic devices have experienced explosive development, and various portable electronic products such as notebook computers and digital cameras have been widely popularized, which provides more development opportunities for rechargeable secondary batteries, and also proposes more requirements. At present, with the commercial development of a new generation of electric vehicles and hybrid electric vehicles, the demand for high-capacity secondary batteries is increasing day by day, coupled with the needs of environmental protection, people are increasingly committed to the development of new energy sources in order to replace coal and traditio...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/136H01M4/525B82Y30/00B82Y40/00
CPCY02E60/122B82Y30/00B82Y40/00H01M4/364H01M4/52H01M4/625H01M10/0525Y02E60/10
Inventor 高明霞王军华潘洪革刘永锋
Owner 江苏海四达电源有限公司
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