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N-doped porous carbon nano-fiber@tin dioxide lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery and nanofiber technology, which is applied in the field of electrochemical energy to achieve the effects of improving cycle performance and stability, being easy to operate, and realizing large-scale production.

Active Publication Date: 2018-07-24
HEFEI UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0005] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides a kind of N-doped porous carbon nanofiber@tin dioxide lithium-ion battery negative electrode material and its preparation method, aiming to solve the stability and problems of tin dioxide The problem of volume expansion during battery charging and discharging improves the cycle performance and rate performance of the battery and improves the stability of the battery

Method used

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  • N-doped porous carbon nano-fiber@tin dioxide lithium-ion battery negative electrode material and preparation method thereof
  • N-doped porous carbon nano-fiber@tin dioxide lithium-ion battery negative electrode material and preparation method thereof
  • N-doped porous carbon nano-fiber@tin dioxide lithium-ion battery negative electrode material and preparation method thereof

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Embodiment 1

[0037] The present embodiment prepares lithium-ion battery negative electrode material according to the following steps:

[0038] (1) Weigh 1.488g zinc nitrate hexahydrate Zn(NO 3 ) 2 ·6H 2 O is dissolved in 100mL methanol solution; Then take 2-methylimidazole 3.28g and dissolve in 100mL methanol solution; The solution of 2-methylimidazole is poured into Zn(NO 3 ) 2 ·6H 2 In the solution of O, stir vigorously at room temperature for 8h, and then centrifuge (11000rpm, time 15min) to obtain ZIF-8 nanoparticles; add 5mL of N,N-dimethylformamide to ZIF-8 nanoparticles, and ultrasonically dissolve Then add 0.35g of polyacrylonitrile and stir at room temperature for 4h to obtain electrospinning solution;

[0039] Add the electrospinning solution into a 10mL syringe, and then use a spinning machine to start electrospinning to obtain nanofibers containing ZIF-8. The specific conditions are: the voltage is 11.5kv, the flow rate is 0.4mL / h, and the spinneret The distance to the re...

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Abstract

The invention discloses an N-doped porous carbon nano-fiber@tin dioxide lithium-ion battery negative electrode material and a preparation method thereof. The preparation method is characterized by comprising the following steps: firstly, preparing nano-fibers containing ZIF-8 through an electrostatic spinning method and carrying out high-temperature calcination under the protection of inert gas toprepare porous carbon nano-fibers CNF; then covering outer surfaces of the porous carbon nano-fibers CNF with one layer of SnO2 nanoparticles through a hydrothermal method, so as to obtain a CNF@SnO2nano composite material; finally, covering the outer surface of the composite material with one layer of polypyrrole PPy and carrying out the high-temperature calcination to obtain an N-doped CNF@SnO2 nano composite material used as the lithium-ion battery negative electrode material. The N-doped porous carbon nano-fiber@tin dioxide lithium-ion battery negative electrode material disclosed by theinvention is the chargeable and dischargeable lithium-ion battery negative electrode material; the problems that the stability and the electrical conductivity of the metal SnO2 nanoparticles are poorin a charging / discharging process of a battery are effectively solved, and the circulating performance and the rate performance of the battery are improved; the preparation method disclosed by the invention is simple and is hopeful to realize large-scale production, so that the preparation method has a very good application prospect.

Description

technical field [0001] The invention relates to an N-doped CNF@SnO 2 The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of electrochemical energy. Background technique [0002] With the growth of the global economy, energy issues have become the focus of global attention. The demand for energy is constantly increasing, and traditional fossil energy is still mainly coal, carbon, oil, etc., with limited storage capacity and low utilization rate. Therefore, in order to solve the energy crisis and alleviate the pressure of environmental pollution, it is imminent to seek a sustainable, clean and efficient new energy system. [0003] Lithium-ion batteries (LIB) have been widely used in portable electronic devices (such as laptops, electric vehicles) due to their superior properties such as high energy density, long cycle life, no memory effect, and environmental friendliness. The most commonly used ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485
CPCH01M4/362H01M4/485Y02E60/10
Inventor 张传玲李昊刘江涛姜志浩卢兵荣
Owner HEFEI UNIV OF TECH
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