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Nitrogen-doped mesonphase carbosphere as well as preparation method and application thereof

A technology of mesophase carbon microspheres and reaction, which is used in the preparation/purification of carbon, active material electrodes, electrical components, etc.

Inactive Publication Date: 2021-05-18
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, mesocarbon microsphere materials have been reported as negative electrodes for lithium batteries, but most of the mesocarbon microsphere materials used as negative electrodes for lithium batteries still have room for improvement in their charge-discharge capacity and cycle life.

Method used

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  • Nitrogen-doped mesonphase carbosphere as well as preparation method and application thereof
  • Nitrogen-doped mesonphase carbosphere as well as preparation method and application thereof
  • Nitrogen-doped mesonphase carbosphere as well as preparation method and application thereof

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Embodiment 1

[0037] A preparation method of nitrogen-doped mesophase carbon microspheres, comprising the following specific steps:

[0038] (1) Heat naphthalene to 210°C at a heating rate of 5°C in a closed reactor A with nitrogen gas, place pitch in reactor B with nitrogen gas, and heat it to 85°C at a heating rate of 2°C, wherein, naphthalene The molar ratio of asphalt and asphalt is 1:0.1, reactor A and reactor B are connected by a conduit, and the air duct has a valve control switch. Reactor B has a long inlet and a short outlet, and the outlet is connected with tetrahydrofuran absorption liquid. When the reactor When the temperature of A reaches 210°C and the reactor B reaches 85°C, open the valve between reactor A and reactor B, let the naphthalene vapor pass into the semi-condensed asphalt to fully absorb, and when the naphthalene evaporates, the reactor A Heating is stopped, and isotropic pitch is obtained in reactor B;

[0039] (2) Feed nitrogen gas into reactor B, raise the temp...

Embodiment 2

[0045] A preparation method of nitrogen-doped mesophase carbon microspheres, comprising the following specific steps:

[0046] (1) Heat naphthalene in a closed reactor A with nitrogen to 220°C at a heating rate of 7°C, place the pitch in reactor B with nitrogen, and heat it to 90°C at a heating rate of 4°C, wherein, naphthalene The molar ratio of asphalt to asphalt is 1:0.5. Reactor A is connected to reactor B by a conduit, and the air duct has a valve control switch. Reactor B has a long inlet and a short outlet, and the outlet is connected with tetrahydrofuran absorption liquid. When the reactor When the temperature of A reaches 220°C and the reactor B reaches 90°C, open the valve between reactor A and reactor B, let the naphthalene vapor pass into the semi-condensed asphalt to fully absorb, and when the naphthalene evaporates, the reactor A Heating is stopped, and isotropic pitch is obtained in reactor B;

[0047] (2) Feed nitrogen into reactor B, raise the temperature to 41...

Embodiment 3

[0054] A preparation method of nitrogen-doped mesophase carbon microspheres, comprising the following specific steps:

[0055] (1) Heat naphthalene to 230°C at a heating rate of 10°C in a closed reactor A with nitrogen gas, place pitch in reactor B with nitrogen gas, and heat it to 95°C at a heating rate of 5°C, wherein, naphthalene The molar ratio of asphalt and asphalt is 1:1. Reactor A and reactor B are connected by a conduit, and the air duct has a valve control switch. Reactor B has a long inlet and a short outlet, and the outlet is connected with tetrahydrofuran absorption liquid. When the reactor When the temperature of A reaches 230°C and the reactor B reaches 95°C, open the valve between reactor A and reactor B, let the naphthalene vapor pass into the semi-condensed asphalt for full absorption, and when the naphthalene evaporates, the reactor A Heating is stopped, and isotropic pitch is obtained in reactor B;

[0056] (2) Feed nitrogen gas into reactor B, raise the t...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a nitrogen-doped mesonphase carbosphere and a preparation method and application thereof. The nitrogen-doped mesonphase carbosphere comprises a mesonphase carbosphere body and nitrogen, wherein the nitrogen is doped in a lamellar structure of the mesonphase carbosphere body. The preparation method comprises the following steps: heating asphalt to a semi-solidified state, then introducing naphthalene steam to obtain isotropic pitch, carrying out a thermal polycondensation reaction on the isotropic pitch, then conducting cooling, carrying out extracting, subjecting an aqueous extract to filtering, cleaning and drying so as to obtain the mesonphase carbosphere body, uniformly mixing the mesonphase carbosphere body, a defect introducing agent and a polar solvent, successively conducting drying and sintering to obtain a mesonphase carbosphere body with defects, mixing the mesonphase carbosphere body with defects with ammonia water, carrying out a heating reaction, conducting filtering, and cleaning filter residues to obtain the nitrogen-doped mesonphase carbosphere. According to the nitrogen-doped mesonphase carbosphere synthesized by using the method, the uniformity of the nitrogen-doped mesonphase carbosphere can be greatly improved, and the nitrogen-doped mesonphase carbosphere has excellent charge-discharge capacity and structural stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a nitrogen-doped mesophase carbon microsphere and a preparation method and application thereof. Background technique [0002] With the large screen and diversified functions of digital terminal products, new requirements are put forward for battery life. The current lithium battery material has a low gram capacity, which cannot meet the growing demand of terminals for batteries. The 372mAh / g of graphite anode, the largest anode material in the market, is far from keeping up with the technical indicators of large battery life and large capacity required by the electronic product market. [0003] Spherical carbon materials were discovered by researchers in the 1960s, and have recently become the focus of research by researchers again. Scientific researchers have found that during the formation of coke, the asphalt compounds will undergo mesophase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 余海军彭挺谢英豪朱红梅李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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