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A kind of long cycle life lithium ion battery carbon negative electrode material and preparation method thereof

A lithium-ion battery and anode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low cycle life and rate performance of natural graphite, difficulty in overcoming structural degradation, degradation of battery cycle performance, etc., and achieve excellent chemical stability High stability, excellent structural stability, and less side effects

Active Publication Date: 2019-06-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the widely used commercial graphite anode materials mainly include natural graphite, artificial graphite and composite graphite. Due to the weak interlayer bonding force of natural graphite, when lithium ions are inserted into the graphite layer, lithium ions and solvent molecules are prone to be separated. Co-intercalation leads to the peeling of graphite sheets, which leads to a decrease in battery cycle performance, so the cycle life and rate performance of natural graphite are relatively low
Compared with natural graphite, ordinary artificial graphite has adjustable graphitization degree and structural stability, so it has higher mass specific capacity and relatively better cycle life, but because its structure is still graphite sheets arranged in parallel parallel lines , so it is still difficult to overcome the problem of structural degradation caused by slippage between layers inherent in graphite materials
In order to solve this problem, although the composite graphite material prepared by surface coating can improve the inherent shortcomings of ordinary graphite materials to a certain extent, it still cannot solve the problem from the root.

Method used

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  • A kind of long cycle life lithium ion battery carbon negative electrode material and preparation method thereof
  • A kind of long cycle life lithium ion battery carbon negative electrode material and preparation method thereof
  • A kind of long cycle life lithium ion battery carbon negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] Preheat the chemical vapor phase reaction furnace to 1200°C in an argon atmosphere, use ethylene as a raw material, and control the concentration of the raw material to 0.1mg / cm 3 , the reaction time is 5 hours, and the carbon microsphere precursor is prepared. First, the carbon microsphere precursor was heat-treated at 1400°C for 10 hours, the heating rate was 1°C / min, and the heat treatment atmosphere was a hydrogen-argon mixture containing 10% hydrogen. The carbon microsphere precursor that has undergone low-temperature heat treatment is heat-treated at 3000°C for 1 hour, the heating rate is 5°C / min, and the heat treatment atmosphere is argon, so that a multi-shell and carbon sheet with an average particle size of 800 nm can be obtained. The layer is a carbon microsphere material with a structure similar to concentric spheres. According to the test method of lithium-ion battery negative electrode materials in button batteries (active material powder, conductive agen...

Embodiment 2

[0021] Preheat the chemical vapor phase reaction furnace to 1300°C in an argon atmosphere, use coal tar as a raw material, and control the concentration of the raw material to 20mg / cm 3 , the reaction time is 2 hours, and the carbon microsphere precursor is prepared. First, the carbon microsphere precursor was heat-treated at 1200°C for 8 hours, the heating rate was 2°C / min, and the heat treatment atmosphere was argon. The carbon microsphere precursor that has undergone low-temperature heat treatment is heat-treated at 2600 ° C for 2 hours, the heating rate is 1 ° C / min, and the heat treatment atmosphere is argon, and the multi-shelled and carbon microspheres with an average particle size of 1 micron can be obtained. The sheet layer is a carbon microsphere material with a structure similar to that of concentric spheres. According to the test method of the lithium-ion half-battery in Example 1, the material of Example 2 has a reversible capacity of 300.0mAh / g after 100 times...

Embodiment 3

[0023] Preheat the chemical vapor phase reaction furnace to 900°C in an argon atmosphere, use pyridine as a raw material, and control the concentration of the raw material to 1.55mg / cm 3 , the reaction time is 3 hours, and the carbon microsphere precursor is prepared. First, the carbon microsphere precursor was heat-treated at 1200 °C for 5 hours, the heating rate was 1 °C / min, and the heat treatment atmosphere was nitrogen. The low-temperature heat-treated carbon microsphere precursor is heat-treated at 2800°C for 1 hour, the heating rate is 2°C / min, and the heat-treatment atmosphere is argon to obtain multi-shell and carbon microspheres with an average particle size of 2 microns. The carbon microsphere material whose sheets are arranged in a structure similar to concentric spheres, and its transmission microscope photos are as follows: figure 1 shown. According to the test method of the lithium-ion half-battery in Example 1, the material of Example 3 has a reversible capac...

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Abstract

The invention relates to a carbon negative electrode material of a lithium-ion battery with long cycle life and a preparation method of the carbon negative electrode material. The material has a multi-layer carbon shell structure, and carbon shells are in spherical-like concentric arrangement and have a spherical shape and the diameters are 0.5-30 microns. The carbon material is prepared through low-temperature thermal treatment and high-temperature thermal treatment on a precursor which is prepared by chemical vapor pyrolysis or through carbon particles by a resin coating method. The carbon material has charge and discharge behaviors similar to a graphite negative electrode material, overlong cycling stability, more excellent charge and discharge capacity and high rate capability when used as the negative electrode material of the lithium-ion battery.

Description

technical field [0001] The invention relates to a long cycle life lithium-ion battery carbon negative electrode material and a preparation method thereof. The material has a multi-layer carbon shell structure and the carbon shells are concentrically arranged in a spherical shape, and has a spherical shape, and is mainly used in a lithium-ion battery negative electrode Material. Background technique [0002] Since Sony commercialized lithium-ion batteries in 1990, lithium-ion batteries have been widely used in various portable electronic devices (such as smartphones, tablet computers, notebook computers and cameras, etc.) due to their excellent energy density and power density. , and has become an integral part of our lives. With the development of society, the rapid replacement of electronic products makes people put forward higher expectations for lithium-ion batteries, hoping that the capacity, rate performance and safety performance of lithium-ion batteries will be impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393Y02E60/10
Inventor 宋怀河曹斌陈晓红
Owner BEIJING UNIV OF CHEM TECH
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