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SiOC and nitrogen-doped carbon fiber composite negative electrode of lithium battery and preparation method

A nitrogen-doped carbon fiber and lithium battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as difficult processes, improve electrical conductivity and cycle performance, and simplify the sintering process

Inactive Publication Date: 2021-02-26
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a lithium battery SiOC@nitrogen-doped carbon fiber composite negative electrode and its preparation method, which are used to solve the problem that the SiOC negative electrode material process is difficult in the prior art; the above-mentioned SiOC @Nitrogen-doped carbon fiber composite negative electrode is loaded with polysiloxane by alumina, and then sintered with polyacrylonitrile after spinning, which can be formed into lithium battery negative electrode material at one time. Compared with the traditional production process, the sintering process obtains a larger simplify

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  • SiOC and nitrogen-doped carbon fiber composite negative electrode of lithium battery and preparation method

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Embodiment 1

[0045] A method for preparing a lithium battery SiOC@nitrogen-doped carbon fiber composite negative electrode, comprising the following steps:

[0046] S1. Preparation of Al 2 o 3 / polysiloxane composite particles: the parts by weight of KH550 silane coupling agent, absolute ethanol, dilute hydrochloric acid aqueous solution, and porous alumina microspheres are 100 parts, 100 parts, 10 parts, and 30 parts in sequence;

[0047] S11. Add KH550 silane coupling agent into absolute ethanol, then add dilute hydrochloric acid aqueous solution (molar concentration of hydrochloric acid is 0.5mol / L), keep mechanical stirring for 30min to obtain sol;

[0048] S12. Add ammonia water to the sol to adjust the pH of the sol to neutral, add porous alumina microspheres (1-20 μm in size, 50-500 nm in pore size) to fully absorb the sol, filter it, and heat-treat it at 100°C for 90 minutes to get the product Al 2 o 3 / polysiloxane composite particles;

[0049] S2. Preparation of spinning fi...

Embodiment 2

[0054] A method for preparing a lithium battery SiOC@nitrogen-doped carbon fiber composite negative electrode, comprising the following steps:

[0055] S1. Preparation of Al 2 o 3 / Polysiloxane composite particles: the parts by weight of KH550 silane coupling agent, absolute ethanol, dilute hydrochloric acid aqueous solution, and porous alumina microspheres are 150 parts, 200 parts, 30 parts, and 50 parts in sequence;

[0056] S11. Add KH550 silane coupling agent into absolute ethanol, then add dilute hydrochloric acid aqueous solution (the molar concentration of hydrochloric acid is 0.1mol / L), keep mechanical stirring for 30min to obtain a sol;

[0057] S12. Add ammonia water to the sol to adjust the pH of the sol to neutral, add porous alumina microspheres (1-20 μm in size, 50-500 nm in pore size) to fully absorb the sol, filter, and heat-treat at 110°C for 30 minutes to get the product. Al 2 o 3 / polysiloxane composite particles;

[0058] S2. Preparation of spinning f...

Embodiment 3

[0063] A method for preparing a lithium battery SiOC@nitrogen-doped carbon fiber composite negative electrode, comprising the following steps:

[0064] S1. Preparation of Al 2 o 3 / Polysiloxane composite particles: the parts by weight of KH550 silane coupling agent, absolute ethanol, dilute hydrochloric acid aqueous solution, and porous alumina microspheres are 120 parts, 140 parts, 15 parts, and 35 parts in sequence.

[0065] S11. Add KH550 silane coupling agent into absolute ethanol, then add dilute hydrochloric acid aqueous solution (molar concentration of hydrochloric acid is 0.2mol / L), keep mechanical stirring for 30min to obtain sol;

[0066] S12. Add ammonia water to the sol to adjust the pH of the sol to neutral, add porous alumina microspheres (1-20 μm in size, 50-500 nm in pore size) to fully absorb the sol, filter, heat-treat at 110°C for 60 minutes, and obtain Al 2 o 3 / polysiloxane composite particles;

[0067] S2. Preparation of spinning film: the weight ra...

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Abstract

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a SiOC and nitrogen-doped carbon fiber composite negative electrode of a lithium batteryand a preparation method of the SiOC and nitrogen-doped carbon fiber composite negative electrode, and the preparation method comprises the following steps: S1, preparing Al2O3 / polysiloxane compositeparticles; s2, preparing a spinning film; and S3, preparing the nitrogen-doped carbon fiber / SiOC composite negative electrode material. The method solves the problem of high process difficulty of theSiOC negative electrode material in the prior art. According to the SiOC and nitrogen-doped carbon fiber composite negative electrode, after polysiloxane is loaded on aluminum oxide, sintering is carried out after spinning is carried out on the polysiloxane and polyacrylonitrile, a lithium battery negative electrode material can be formed at a time, and compared with a traditional production process, the sintering process is greatly simplified. And meanwhile, in the negative electrode material prepared by the spinning process, more SiOC is embedded in the carbon fiber, so that the conductivityand the cycle performance of the SiOC can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrode materials, in particular to a lithium battery SiOC@nitrogen-doped carbon fiber composite negative electrode and a preparation method thereof. Background technique [0002] As a new type of high-energy battery, lithium-ion battery has been widely used in people's daily life. As the main component of the lithium battery, the negative electrode material directly affects the performance of the lithium battery. The negative terminal refers to the lower potential end of the power supply. In a primary battery, it refers to the electrode that oxidizes, and it is written on the left in the battery reaction. From a physical point of view, it is a pole from which electrons flow out of the circuit. The anode material refers to the raw material that constitutes the anode in the battery. At present, the common anode materials include carbon anode materials, tin-based anode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/587H01M4/62H01M4/133H01M10/0525
CPCH01M4/133H01M4/1393H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈庆廖健淞司文彬白涛
Owner CHENDU NEW KELI CHEM SCI CO LTD
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