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

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...

Examples

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...

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...

Examples

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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