Preparation method of nitrogen-doped silicon/carbon core-shell structure lithium-ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, applied in the field of materials science, can solve problems such as conductive network damage, electrode pulverization, carbon layer cracking, etc., and achieve the effects of improved cycle performance, low cost, and high capacity

Inactive Publication Date: 2018-09-14
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Among all negative electrode materials, silicon has the highest theoretical specific capacity (4200mAh/g), which is an ideal negative electrode material, but the large volume expansion (about 300%) of silicon-based negative electrode materials during charge and discharge causes electrod

Method used

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  • Preparation method of nitrogen-doped silicon/carbon core-shell structure lithium-ion battery negative electrode material
  • Preparation method of nitrogen-doped silicon/carbon core-shell structure lithium-ion battery negative electrode material

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[0022] Example 1

[0023] A method for preparing a nitrogen-doped silicon / carbon core-shell structure lithium ion battery negative electrode material. Melamine and polyacrylonitrile are dissolved in N,N-dimethylformamide solvent in a mass ratio of 1:10 to prepare Precursor sheath liquid; silicon nanoparticles and polyvinylpyrrolidone are respectively dissolved in N,N-dimethylformamide solvent and stirred for ultrasound, and the two are mixed and stirred to prepare a precursor core liquid. The raw fiber was obtained by coaxial electrospinning method, and then carbonized at high temperature to obtain a silicon@carbon / carbon nanofiber core-shell structure lithium-ion battery electrode material with nitrogen-doped internal carbon network connected.

[0024] The above-mentioned preparation method of a silicon@carbon / carbon nanofiber core-shell structure lithium ion battery negative electrode material connected by a nitrogen-doped internal carbon network specifically includes the fo...

Example Embodiment

[0029] Example 2

[0030] A nitrogen-doped silicon / carbon core-shell structure lithium ion battery negative electrode material, calculated according to the mass ratio, that is, the ratio of polyacrylonitrile and polypyrrole is 10:1, and successively dissolved in N, N-dimethylformamide solvent A precursor sheath liquid is prepared; silicon nanoparticles and polyvinylpyrrolidone are in a ratio of 6:1, respectively dissolved in N,N-dimethylformamide solvent to prepare a precursor core liquid. Nitrogen-doped silicon@carbon / carbon nanofiber core-shell lithium-ion battery electrode materials with interconnected internal carbon network were prepared by coaxial electrospinning and high-temperature carbonization.

[0031] The preparation method of the above-mentioned nitrogen-doped silicon / carbon core-shell structure lithium ion battery negative electrode material specifically includes the following steps:

[0032] (1) Preparation of precursor solution

[0033]At room temperature, ac...

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Abstract

The invention provides a preparation method of a nitrogen-doped silicon/carbon core-shell structure lithium-ion battery negative electrode material. The preparation method comprises the following steps: dissolving a nitrogen-containing substance and polyacrylonitrile into an N,N-dimethylformamide solvent to obtain sheath liquid; dissolving nano silicon powder and polyvinylpyrrolidone into the N,N-dimethylformamide solvent to obtain core liquid; putting injection syringes filled with the core liquid and the sheath liquid on two injection pumps of an electrostatic spinning device respectively and carrying out coaxial electrostatic electric spinning; collecting precursor fibers sprayed by the electric spinning on a rolling shaft; putting the obtained precursor fibers into an air atmosphere muffle furnace and carrying out pre-oxidization; then carbonizing under a protection atmosphere of inert gas and at the carbonization temperature of 700 to 1000 DEG C, so as to obtain a nitrogen-doped inner carbon net communicated silicon@carbon/carbon nano-fiber core-shell structure lithium-ion battery negative electrode material. The nitrogen-doped silicon/carbon core-shell structure lithium-ion battery negative electrode material obtained by the method provided by the invention has the characteristics of high capacity and good circulating stability.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a lithium ion battery negative electrode material, in particular to a preparation method of a nitrogen-doped silicon / carbon core-shell structure lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries feature high energy density, low self-discharge rate, and high energy conversion efficiency, making them a power source for a variety of commodities. At present, lithium-ion batteries have been extended from being used in portable electronic devices to being used in electric (or hybrid) vehicles, etc. Accordingly, the demand for lithium-ion batteries with higher capacity and good cycle performance is also becoming higher and higher. [0003] As an important part of lithium-ion batteries, anode materials directly restrict the electrochemical performance of lithium-ion batteries. However, the commercial lithium-ion battery anode material gra...

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 郑时有杨俊和徐影袁涛庞越鹏边子浩
Owner UNIV OF SHANGHAI FOR SCI & TECH
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