Lithium ion battery negative material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex process, non-uniform performance, easy powdering, etc., to alleviate the volume effect, the preparation method is simple, and the The effect of conductivity

Active Publication Date: 2019-06-18
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a lithium-ion battery negative electrode material and a preparation method thereof, aiming at solving the complex process of preparing the lithium-ion battery negative electrode material and the problem of the existing lithium-ion battery negative electrode material. Insufficient electrical conductivity, uneven performance, easy agglomeration and easy pulverization during the cycle

Method used

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  • Lithium ion battery negative material and preparation method thereof
  • Lithium ion battery negative material and preparation method thereof
  • Lithium ion battery negative material and preparation method thereof

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[0031] see figure 1 , the present invention provides a flow chart of a preferred embodiment of a preparation method of a negative electrode material for a lithium ion battery, as shown in the figure, which includes steps:

[0032] S10, providing a porous nitrogen-doped carbon nanofiber membrane;

[0033] S20, adding the porous nitrogen-doped carbon nanofiber membrane into a mixed solution containing soluble copper salt and soluble cobalt salt, and depositing the copper ions and cobalt ions on the porous nitrogen-doped carbon fiber membrane by solvothermal method internal;

[0034] S30. Take out the porous nitrogen-doped carbon fiber membrane, and perform the first calcination treatment and the second calcination treatment on the porous nitrogen-doped carbon fiber membrane under an inert atmosphere and an air atmosphere respectively. A heterogeneous structure of copper-cobalt oxide is generated in the heterocarbon nanofiber film, and the negative electrode material of the lit...

Embodiment 1

[0047] Weigh polyacrylonitrile (PAN) and cetyltrimethylammonium bromide (CTAB) with a mass ratio of 10:2 and add them to N,N-dimethylformamide (DMF) solution and stir vigorously to obtain PAN Spinning solution, the spinning solution is passed through an electrospinning machine under the conditions of 15kv high voltage and a high speed of 800 revolutions per minute using 21 conductive needles to obtain a filamentous product; the filamentous product is in the air at 280 ° C Pre-oxidize for 2 hours, then carbonize and sinter at 800°C, keep warm for 2 hours, and cool to room temperature to obtain a porous carbon fiber substrate. A water / ethylene glycol mixed solvent is used, the volume of the solvent hot liquid is 30ml, the molar ratio of copper nitrate to cobalt nitrate is 1:1, and the mass of porous carbon fiber added is 20mg. The solvothermal product was first calcined at 400 °C for 2 h under the protection of nitrogen, and then oxidized at a low temperature of 200 °C for 6 h t...

Embodiment 2

[0049] Weigh polyacrylonitrile (PAN) and cetyltrimethylammonium bromide (CTAB) with a mass ratio of 10:1 and add them to the N,N-dimethylformamide solution. Stir vigorously in a methylformamide (DMF) solution to obtain a PAN spinning solution, which is obtained by electrospinning the spinning solution with 20 conductive needles under the condition of 15kv high voltage and a high speed of 900 revolutions per minute through an electrospinning machine. Filamentous product; finally pre-oxidized in air at 280°C for 2h, then carbonized and sintered at 700°C, kept for 2h, cooled to room temperature to obtain a porous carbon fiber substrate. A water / ethylene glycol mixed solvent is used, the volume of the solvent hot liquid is 30ml, the molar ratio of copper sulfate to cobalt nitrate is 1.5:1, and the mass of the porous carbon fiber added is 25mg. The solvothermal product was first calcined at 400 °C for 2 h under the protection of nitrogen, and then oxidized at a low temperature of 2...

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Abstract

The invention discloses a lithium ion battery negative material and a preparation method thereof. The preparation method comprises the following steps: adding pre-prepared porous nitrogen-doped carbonnanofiber membrane into a mixed solution containing soluble copper salt and soluble cobalt salt, depositing copper ion and cobalt ion into the porous nitrogen-doped carbon fiber membrane through a solvothermal method; taking out the porous nitrogen-doped carbon fiber membrane and orderly performing the first calcination treatment and the second calcination treatment on the porous nitrogen-doped carbon fiber membrane under an inert atmosphere and an air atmosphere, generating copper-cobalt oxide heterogeneous structure in the porous nitrogen-doped carbon nanofiber membrane, and preparing the lithium ion battery negative material. The lithium ion battery negative material prepared through the invention not only can effectively and quickly transmit ions and electrons between the electrodes,and the material conductivity is greatly improved through the importing of the copper-oxygen defect; different oxides can be mutually buffered so as to relieve the volume effect in the circulating process.

Description

technical field [0001] The invention relates to the field of preparation of lithium ion battery electrode materials, in particular to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Since the 21st century, energy shortage and environmental pollution are major challenges facing mankind. Lithium-ion batteries are considered as important energy storage and conversion technologies. At present, most of the anode materials for commercial lithium-ion batteries are graphite materials, and the lower theoretical capacity of graphite limits its further application in lithium-ion batteries. The theoretical specific capacity of transition metal oxides is high, however, due to thermodynamic and kinetic limitations, this type of material has defects such as large volume change during cycling, rapid capacity decay, low initial Coulombic efficiency, and poor electrical conductivity. . In view of the above shortcomings of tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/525H01M4/38H01M10/0525
CPCY02E60/10
Inventor 任祥忠陈焕辉李永亮邓立波
Owner SHENZHEN UNIV
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