Preparation method of cathode material of germanium-mesoporous carbon fiber composite lithium battery

A negative electrode material and fiber composite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of waste of biomass resources, environmental pollution, lack of effective utilization technology, etc., achieve high specific capacity, unique structure, excellent The effect of cycle stability

Active Publication Date: 2015-07-15
QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the main by-product of sulfite pulping, sodium lignosulfonate is mainly used as a low value-added product due to the lack of effective utilization technology, or it i...

Method used

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  • Preparation method of cathode material of germanium-mesoporous carbon fiber composite lithium battery
  • Preparation method of cathode material of germanium-mesoporous carbon fiber composite lithium battery
  • Preparation method of cathode material of germanium-mesoporous carbon fiber composite lithium battery

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Experimental program
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Effect test

Embodiment 1

[0036] 1. Preparation of mesoporous carbon fiber (MCF):

[0037] Take 0.994 g of LN, 0.426 g of PAN and 10 ml of DMF solvent, stir evenly and obtain LN / PAN composite fiber by electrospinning; place the obtained LN / PAN composite fiber in distilled water and etch for 48 h, Dry in a blast drying oven at 70 °C to obtain fibers with a special porous structure; place the porous structure fibers in a muffle furnace under an air atmosphere at 280 °C for 1 h, and in a tube furnace under a nitrogen atmosphere at 1.5 °C / min The heating rate was raised to 700 °C and kept at a constant temperature for 2 h; finally, heated to 850 °C with CO 2 After gas activation for 1 h, mesoporous carbon fibers (MCF) were obtained. The prepared MCF is a mesoporous fibrous structure with a specific surface area of ​​1070 m 2 g -1 , SEM such as figure 1 As shown, the nitrogen adsorption-desorption isotherm is shown as figure 2 shown.

[0038] 2. Preparation of Germanium-Mesoporous Carbon Fiber (GeMC...

Embodiment 2

[0043] 1. Preparation of Mesoporous Carbon Fibers (MCF)

[0044] Take 0.710 g of LN, 0.710 g of PAN and 10 ml of DMF solvent, stir evenly and obtain LN / PAN composite fiber by electrospinning; place the obtained LN / PAN composite fiber in distilled water and etch for 48 h, Dry in a blast oven at 70 °C; place the dried fibers in a muffle furnace under an air atmosphere at 280 °C for 1 h, then raise the temperature to 700 °C at a rate of 1.5 °C / min in a tube furnace under a nitrogen atmosphere. ℃ and keep the temperature for 2 h; finally, heated to 850 ℃ with CO 2 After gas activation for 1 h, mesoporous carbon fibers (MCF) were obtained.

[0045] 2. Preparation of Germanium-Mesoporous Carbon Fiber (GeMCF) Composites

[0046] Take 50 mg of MCF, 5 ml of concentrated nitric acid, and 5 ml of distilled water, put them into a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 60 °C for 60 min, then centrifuge and wash; wash the obtained MCF and 3 ml of GeCl 4 , 10 ml...

Embodiment 3

[0050] 1. Preparation of Mesoporous Carbon Fibers (MCF)

[0051] Take 0.994 g of LN, 0.426 g of PAN and 10 ml of DMF solvent, stir evenly and obtain LN / PAN composite fiber by electrospinning; place the obtained LN / PAN composite fiber in distilled water and etch for 48 h, Dry in a blast oven at 70 °C; place the dried fibers in a muffle furnace under an air atmosphere at 280 °C for 1 h, then raise the temperature to 700 °C at a rate of 1.5 °C / min in a tube furnace under a nitrogen atmosphere. ℃ and keep the temperature for 2 h; finally, heated to 850 ℃ with CO 2 After gas activation for 1 h, mesoporous carbon fibers (MCF) were obtained.

[0052] 2. Preparation of Germanium-Mesoporous Carbon Fiber (GeMCF) Composites

[0053] Take 50 mg of MCF, 5 ml of concentrated nitric acid, and 5 ml of distilled water, put them into a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 60 °C for 60 min, then centrifuge and wash; wash the obtained MCF and 4.6 ml of GeCl 4 , 10 ...

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Abstract

The invention relates to a preparation method of an cathode material of a germanium-mesoporous carbon fiber composite lithium battery. The preparation method comprises the following steps: preparing LN and PAN mixed solutions in different ratios and obtaining LN/PAN composite fibers by virtue of electrostatic spinning, putting the LN/PAN composite fibers into a solvent for etching, and then obtaining carbon fibers of a special mesoporous structure by virtue of pre-oxidation and carbonation; finally, compounding the prepared carbon fibers of the mesoporous structure with GeCl4, and calcining in the mixed atmosphere of N2/H2 in a tubular furnace to obtain the Ge@MCF composite material. According to the preparation method, the mesoporous carbon fibers are prepared by virtue of etching in a waste-based solvent, and the process is green, environment-friendly, and simple; the mesoporous carbon fibers are taken as nano-reactors to prepare the mesoporous carbon fiber composite germanium electrode material; due to the range limitation effect of the mesoporous carbon fibers, the volume change of the germanium electrode material in the lithium implanting/stripping process can be effectively buffered, and high specific capacity and excellent cyclic stability are shown.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to a preparation method of germanium-mesoporous carbon fiber composite lithium battery negative electrode materials. Background technique [0002] In recent years, the rapid development of portable electronic equipment, electric tools and electric vehicle technology has put forward higher requirements on the performance of lithium-ion batteries. The theoretical specific capacity of traditional graphite anode materials is only 372 mAh g -1 , it has been difficult to meet the increasing requirements for battery cycle performance and energy density. Therefore, finding negative electrode materials with higher specific capacity and good cycle stability has become an important development direction in the field of lithium-ion battery materials. [0003] The theoretical specific capacity of germanium is as high as 16...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583
CPCH01M4/362H01M4/38H01M4/583H01M10/0525Y02E60/10
Inventor 钱庆荣许丽洪曾令兴陈庆华许兢黄宝铨
Owner QUANGANG PETROCHEM RES INST OF FUJIAN NORMAL UNIV
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