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Porous hard carbon lithium ion battery negative electrode material and preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, which is applied in battery electrodes, carbon preparation/purification, secondary batteries, etc., and can solve problems such as poor low-temperature performance, cumbersome operation, and many synthesis steps

Active Publication Date: 2019-10-08
博尔特新材料(银川)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the methods reported in the literature can synthesize hard carbon negative electrode materials, the methods all have the defects of many synthesis steps and complicated operations, and the obtained hard carbon negative electrode materials have low reversible capacity and poor rate cycle performance. low temperature performance is poor

Method used

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  • Porous hard carbon lithium ion battery negative electrode material and preparation method thereof and lithium ion battery
  • Porous hard carbon lithium ion battery negative electrode material and preparation method thereof and lithium ion battery
  • Porous hard carbon lithium ion battery negative electrode material and preparation method thereof and lithium ion battery

Examples

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Effect test

Embodiment 1

[0034] (1) pulverizing the hydrogenated vegetable oil to obtain a hydrogenated vegetable oil powder with a particle size of less than 100 mesh;

[0035] (2) The hydrogenated vegetable oil powder is heated from 20°C to 350°C at a heating rate of 2°C / min in helium, subjected to low-temperature carbonization treatment for 5 hours, then cooled naturally until the temperature of the calcined product is 20°C, and then pulverized to produce get the precursor;

[0036] (3) Dispersing 100 parts by weight of the precursor in water, then adding 5 parts by weight of polyvinyl alcohol, stirring at a speed of 400 rpm for 7 hours to obtain a slurry, and then drying to obtain material particles;

[0037] (4) Heat the material particles from 20°C to 950°C at a heating rate of 6°C / min in helium, perform high-temperature carbonization treatment for 10 hours, and then cool naturally until the temperature of the calcined product is 20°C, then pulverize and shake To make porous hard carbon lithium...

Embodiment 2

[0039] (1) pulverizing the hydrogenated vegetable oil to obtain a hydrogenated vegetable oil powder with a particle size of less than 100 mesh;

[0040] (2) The hydrogenated vegetable oil powder is heated from 25°C to 250°C at a heating rate of 2°C / min in argon, subjected to low-temperature carbonization treatment for 10 hours, then cooled naturally until the temperature of the calcined product is 25°C, and then pulverized to produce get the precursor;

[0041] (3) Dispersing 100 parts by weight of the precursor in dichloromethane, then adding 20 parts by weight of asphalt, stirring at a speed of 1000 rpm for 0.5 h to obtain a slurry, followed by drying to obtain material particles;

[0042] (4) Raise the temperature of the material particles from 25°C to 650°C at a rate of 2°C / min in nitrogen, perform high-temperature carbonization treatment for 20 hours, then cool naturally until the temperature of the calcined product is 25°C, then pulverize and compact Porous hard carbon ...

Embodiment 3

[0044] (1) pulverizing the hydrogenated vegetable oil to obtain a hydrogenated vegetable oil powder with a particle size of less than 100 mesh;

[0045] (2) Heat the hydrogenated vegetable oil powder from 30°C to 600°C at a heating rate of 2°C / min in argon, perform low-temperature carbonization treatment for 2 hours, then cool naturally until the temperature of the calcined product is 30°C, and then pulverize to produce get the precursor;

[0046](3) Disperse 100 parts by weight of the precursor in a mixed solvent of ethanol and water with a volume ratio of 1:1, then add 1 part by weight of methyl cellulose, and stir at a speed of 50 rpm for 10 h to prepare a slurry , followed by drying treatment to obtain material particles;

[0047] (4) Raise the temperature of the material particles from 30°C to 1400°C at a rate of 10°C / min in nitrogen, perform high-temperature carbonization treatment for 3 hours, then cool naturally until the temperature of the calcined product is 30°C, t...

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Abstract

The invention discloses a porous hard-carbon lithium ion battery anode material, a preparation method thereof and a lithium ion battery. The method comprises steps as follows: hydrogenated vegetable oil powder is prepared firstly and then is subjected to low-temperature carbonizing treatment in inert gas, a precursor is prepared, the precursor is subjected to organic carbon source coating treatment with a solvent and an organic carbon source, material particles are prepared, finally, the material particles are subjected to high-temperature carbonizing treatment, and the porous hard-carbon lithium ion battery anode material is prepared. The method adopts a simple process, a synthesis path is simple and controllable, micro-control for morphology and size of the material is easy, and the prepared porous hard-carbon lithium ion battery anode material is high in reversible capacity and good in rate capability cycle performance and low-temperature performance.

Description

technical field [0001] The invention relates to a novel energy material, in particular to a porous hard carbon lithium ion battery negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] As a new type of high-energy battery, lithium-ion batteries are widely used in small devices such as mobile communication equipment, portable computers, video cameras, cameras, MP3, etc. Electric vehicle (HEV), pure electric vehicle (EV) power supply. Especially with the rapid development of electric vehicles and solar / wind energy storage for lithium-ion batteries, high requirements are placed on the safety, cycle performance, rate performance and high and low temperature performance of lithium-ion batteries. As an important part of lithium-ion batteries, negative electrode materials directly affect the performance of lithium-ion batteries. At present, graphite, as the most widely used carbon-based lithium-ion battery anode materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B32/05
CPCH01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 侯春平孙永林贺超
Owner 博尔特新材料(银川)有限公司
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