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High-capacity ratio rate carbon-based composite material, preparation method thereof and application thereof in lithium ion battery

A technology of carbon-based composite materials and composite particles, which is applied in lithium batteries, carbon preparation/purification, batteries, etc., can solve problems such as poor cycle performance, large silicon powder expansion, and low initial efficiency, so as to inhibit expansion and increase capacity The effect that shows an effect and the magnification performance

Active Publication Date: 2018-03-06
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hard carbon used in this method is formed by carbonization of a soluble carbon-containing organic binder and has a pore structure inside, the first-time efficiency of the material is low, and the silicon powder has a large expansion and poor cycle performance.

Method used

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  • High-capacity ratio rate carbon-based composite material, preparation method thereof and application thereof in lithium ion battery
  • High-capacity ratio rate carbon-based composite material, preparation method thereof and application thereof in lithium ion battery
  • High-capacity ratio rate carbon-based composite material, preparation method thereof and application thereof in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0108] (1) Put Si with a particle size of 30-120nm in a rotary furnace, adjust the rotation speed to 1r / min, feed nitrogen gas, raise the temperature to 800°C at a heating rate of 5°C / min, and feed acetylene gas with a flow rate of 1.5 L / min, heat preservation for 1h, and naturally cool to room temperature to obtain carbon-coated nano-active substances, that is, composite particles composed of nano-active substances and the first carbon coating layer;

[0109] (2) Coke with a median particle size of 3-5 μm, plant-based hard carbon with a median particle size of 5-7 μm, and carbon-coated nano-active substances are placed in a fusion machine at a mass ratio of 40:40:20, and adjusted The rotation speed is 2500r / min, the tool gap width is 0.1cm, and the fusion is performed for 1h to obtain the first precursor;

[0110] (3) Put the first precursor and asphalt powder with a particle size of 0.5-10 μm in a VC high-efficiency mixer at a mass ratio of 70:30, adjust the speed to 1500r / m...

Embodiment 2

[0118] (1) Put ferrosilicon alloy with a particle size of 120-180nm in a rotary furnace, adjust the rotation speed to 1.5r / min, feed nitrogen gas, raise the temperature to 1000°C at a heating rate of 7°C / min, and feed methane gas, the flow rate 2.5L / min, heat preservation for 0.5h, and naturally cool to room temperature to obtain carbon-coated nano-active substances, that is, composite particles composed of nano-active substances and the first carbon coating layer;

[0119] (2) mesophase carbon microspheres with a median particle size of 4-7 μm, resin carbon with a median particle size of 6-9 μm, carbon-coated nano-active substances, and sodium lauryl sulfate in a mass ratio of 43:30: 25:2 was dispersed in propanol, spray-dried to obtain the first precursor;

[0120] (3) Put the first precursor and asphalt powder with a particle size of 1-7 μm in a VC high-efficiency mixer at a mass ratio of 65:25, adjust the rotation speed to 3000r / min, and mix for 1 hour to obtain the second...

Embodiment 3

[0124] (1) Put Si with a particle size of 20-50nm in a rotary furnace, adjust the rotation speed to 3r / min, feed nitrogen gas, raise the temperature to 900°C at a heating rate of 3°C / min, and feed acetone gas with a flow rate of 7L / min, heat preservation for 0.2h, and naturally cool to room temperature to obtain carbon-coated nano-active substances, that is, composite particles composed of nano-active substances and the first carbon coating layer;

[0125] (2) carbon fibers with a median particle size of 5-8 μm, pitch-based hard carbon with a median particle size of 5-8 μm, carbon-coated nano-active substances, and fatty acid polyethylene glycol esters in a mass ratio of 45:20:30: 5 dispersed in ethanol, spray-dried to obtain the first precursor;

[0126](3) Disperse the first precursor and glucose in ethanol at a mass ratio of 65:35, and spray dry to obtain the second precursor;

[0127] (4) kneading and molding the second precursor at 200°C for 2 hours to obtain the third ...

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Abstract

The invention discloses a carbon-based composite material, a preparation method thereof and application thereof. The carbon-based composite material comprises micron-order soft carbon, micron-order hard carbon, a nano-active material, a first carbon coating layer and a second carbon coating layer, wherein the first carbon coating layer is coated on the surface of the nano-active material to form composite particles; the composite particles are dispersed on the surfaces of the soft carbon and the hard carbon and in the second carbon coating layer; the second carbon coating layer coats the softand hard carbon and the composite particles. The method disclosed by the invention comprises the following steps: 1) performing carbon coating on the nano-active material to form composite particles;2) dispersing the composite particles on the surface of the soft carbon and the hard carbon to form a first precursor; 3) performing coating modification by using an organic matter; 4) performing VC heating mixing or mixed kneading and molding; 5) sintering at a high temperature, thereby obtaining the composite material. The composite material disclosed by the invention is very suitable to serve as a negative electrode active material of the lithium ion battery, has high capacity and first charge and discharge efficiency and is excellent in rate capability.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a carbon-based composite material, its preparation method and its application in lithium-ion batteries, in particular to a high-capacity rate type carbon-based composite material, its preparation method and a negative electrode active material containing it Lithium Ion Battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, and high cycle life, and have broad application prospects in the field of electric vehicles. Amorphous carbon materials, easy-to-graphitize soft carbon and hard-to-graphitize hard carbon are expected to be used in electric vehicles due to their firm and stable macromolecular layer structure, in which lithium ions can be quickly deintercalated, and have excellent rate performance. application. However, the lower first-time Coulombic efficiency and first-time Coulombic efficiency of soft carb...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/38H01M4/46H01M4/48H01M4/50H01M4/52H01M4/58H01M10/0525
CPCH01M4/362H01M4/38H01M4/386H01M4/387H01M4/463H01M4/483H01M4/502H01M4/52H01M4/523H01M4/58H01M4/583H01M10/0525H01M2220/20Y02E60/10H01M10/052H01M4/0421H01M4/0471H01M4/364H01M4/366H01M4/587H01M4/625C01B32/205C01B32/05C01B33/02C23C16/26C01P2004/80C01P2006/40H01M2004/027
Inventor 何鹏郭锷明任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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