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Carbon nanomaterial/amorphous carbon/silicon monoxide composite material and preparation method thereof

A technology of carbon nanomaterials and silicon oxide, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of silicon oxygen particles losing electrochemical activity and easy detachment, and achieve improvement Structural pulverization failure problem, simple and unique preparation process, and economical raw materials

Active Publication Date: 2020-06-12
湖州启源金灿新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem that the existing silicon oxide-based composite materials are easily detached after charging and discharging, resulting in the loss of electrochemical activity of silicon oxide particles, a carbon nanomaterial / amorphous carbon nanomaterial with good electrochemical performance is provided. Carbon / Silicon Oxide Composite

Method used

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  • Carbon nanomaterial/amorphous carbon/silicon monoxide composite material and preparation method thereof
  • Carbon nanomaterial/amorphous carbon/silicon monoxide composite material and preparation method thereof
  • Carbon nanomaterial/amorphous carbon/silicon monoxide composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Take 60g carbon nanotubes (length 2-20μm, diameter 1-100nm), 30g sodium carboxymethyl cellulose and 2.67kg silicon oxide powder (median particle size 4μm) into a 5L double planetary mixer, Set revolution at 30rpm, rotation at 300rpm, stir and disperse for 30 minutes to obtain mixed powder;

[0040] (2) Add 1.4 kg of deionized water to the mixed powder obtained in step (1), set the revolution at 30 rpm, rotate at 100 rpm, and knead and stir for 2 hours to obtain a dough-like uniform mixture;

[0041] (3) After the dough-like mixture is transferred to an electric heating constant temperature drying oven at 100°C for drying, it is crushed and graded;

[0042] (4) Transfer the pulverized powder and 220g medium softening point pitch (median particle size is 0.1μm) to VH thermal compound equipment for low-temperature solid-phase coating treatment, mix and heat to 300°C under nitrogen atmosphere , keep warm for 6h, and obtain the precursor after natural cooling;

[0043]...

Embodiment 2

[0048] (1) In a dry environment (relative humidity <10%RH), take 120g graphene (number of graphite layers n<10), 45g polyvinylidene fluoride and 3.0kg silicon oxide powder (median particle size is 1μm) Put it into a 5L double planetary mixer, set the revolution at 20rpm, rotate at 100rpm, stir and disperse for 2 hours to obtain a mixed powder;

[0049] (2) Add 1.8kg of N-methylpyrrolidone to the mixed powder obtained in step (1), set the revolution to 25rpm, the rotation to 200rpm, knead and stir for 4 hours to obtain a dough-like uniform mixture;

[0050] (3) Transfer the dough-like mixture into an electric heating constant temperature drying oven at 110°C for drying, then pulverize and classify;

[0051] (4) Transfer the pulverized powder and 191g of low softening point pitch (median particle size 20μm) into a drum furnace for low-temperature solid-phase coating treatment, mix and heat to 600°C in an argon atmosphere, and keep warm 2h, continue heating to 550°C, keep warm f...

Embodiment 3

[0056] (1) Take 60g carbon fiber VGCF (length 2-20μm, diameter 1-100nm), 40g sodium carboxymethyl cellulose and 2.5kg silicon oxide powder (median particle size is 10μm) into a 5L double planetary mixer, set Set the revolution at 40rpm, rotate at 1000rpm, stir, disperse and mix for 30 minutes to obtain a mixed powder;

[0057] (2) Add 1.2 kg of deionized water to the mixed powder obtained in step (1), set the revolution at 30 rpm, rotate at 100 rpm, knead and stir for 3 hours to obtain a dough-like uniform mixture;

[0058] (3) Transfer the dough-like mixture into an electric heating constant temperature drying oven at 90°C for drying, then pulverize and classify;

[0059] (4) Transfer the pulverized powder and 340g of low softening point asphalt (median particle size is 15μm) into the test drum furnace for low-temperature solid-phase coating treatment, mix and heat to 200°C under a protective atmosphere, and keep warm 5h, the precursor was obtained after natural cooling;

...

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Abstract

The invention relates to the technical field of lithium ion battery negative electrode materials. The invention provides a carbon nanomaterial / amorphous carbon / silicon monoxide composite material anda preparation method thereof in order to solve the problem that silicon-oxygen particles lose electrochemical activity due to the fact that an existing silicon monoxide-based composite material is extremely likely to break away from contact after being charged and discharged. The carbon nanomaterial / amorphous carbon / silicon monoxide composite material is prepared from the following components in parts by weight: 75-97 parts of silicon monoxide, 1-50 parts of a carbon source, 0.1-3 parts of a thickening agent and 0.1-5 parts of a carbon nanomaterial. According to the composite material, the surface layer of silicon monoxide particles is coated with a layer of amorphous carbon; meanwhile, the carbon nanomaterial is uniformly loaded on the surfaces of the silicon monoxide particles, and due to the limiting effect of the amorphous carbon coating layer and the conductive effect of the carbon nanomaterial, the problem of structural pulverization failure of the material in the charging and discharging process can be greatly solved, and good electrochemical performance is shown.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a carbon nanomaterial / amorphous carbon / silicon oxide composite material and a preparation method thereof. Background technique [0002] In recent years, with the growing demand for new energy vehicles and energy storage base stations, the energy field, especially lithium-ion batteries, has attracted widespread attention. At present, the anode material of lithium-ion batteries widely used in industry is graphite carbon material, but its theoretical capacity is low, and it is a hotspot in the field of electrochemistry to find new anode materials with superior performance. [0003] Silicon oxide has become a hot spot in the research and industrialization of high energy density anode materials due to its high theoretical specific capacity, abundant raw material reserves, relatively low price, and environmental friendliness. However, sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62B82Y30/00H01M10/0525
CPCH01M4/366H01M4/583H01M4/48H01M4/625B82Y30/00H01M10/0525H01M2004/027Y02E60/10
Inventor 吕猛金海侹
Owner 湖州启源金灿新能源科技有限公司
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