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A kind of lithium ion battery graphite negative electrode material and preparation method thereof

A lithium-ion battery and graphite negative electrode technology, applied in battery electrodes, graphite, negative electrodes, etc., can solve the problems of poor cycle performance and low-temperature performance, and achieve high charge-discharge efficiency, good low-temperature performance, and good adaptability

Active Publication Date: 2018-11-09
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a lithium-ion battery graphite negative electrode material and a preparation method thereof in order to overcome the problems of poor cycle performance and low-temperature performance of existing graphite materials

Method used

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  • A kind of lithium ion battery graphite negative electrode material and preparation method thereof
  • A kind of lithium ion battery graphite negative electrode material and preparation method thereof
  • A kind of lithium ion battery graphite negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] The preparation method of the present embodiment comprises the following steps:

[0044] (1) In an inert gas, fully mix the coating agent 1 phenolic resin and natural graphite at a mass ratio of 0.5:10, then add it to the coating ax and stir, then heat up to 350 °C at 1.5 °C / min, and keep the temperature for 120 min. Carbonization to obtain coatings;

[0045] (2) Add the coating agent 2 petroleum asphalt powder to the coated ax in step (1), and fully stir and mix according to the mass ratio of petroleum asphalt powder and natural graphite at a ratio of 0.4:10, and then press 3.5°C / min The heating rate is raised to 400°C, and the thermal polycondensation reaction is carried out at a constant temperature of 400°C, and finally the temperature is raised to 580°C for 60 minutes to obtain a complex; the polymerization pressure of the thermal polycondensation reaction is 10MPa, and the reaction time of the thermal polycondensation reaction 60min;

[0046] (3) In an inert gas, ...

Embodiment 2

[0048] The preparation method of the present embodiment comprises the following steps:

[0049] (1) In an inert gas, fully mix the coating agent 1 phenolic resin and natural graphite at a mass ratio of 1:10, then add it to the coating ax and stir, then raise the temperature to 350 °C at 1.5 °C / min, and keep the temperature constant for 120 min. Carbonization to obtain coatings;

[0050] (2) Add the coating agent 2 petroleum asphalt powder to the coated ax in step (1), and fully stir and mix according to the mass ratio of petroleum asphalt powder and natural graphite at a ratio of 0.4:10, and then press 3.5°C / min The heating rate is raised to 400°C, and the thermal polycondensation reaction is carried out at a constant temperature of 400°C, and finally the temperature is raised to 580°C for 60 minutes to obtain a complex; the polymerization pressure of the thermal polycondensation reaction is 10MPa, and the reaction time of the thermal polycondensation reaction 60min;

[0051...

Embodiment 3

[0053] The preparation method of the present embodiment comprises the following steps:

[0054] (1) In an inert gas, fully mix the coating agent 1 phenolic resin and natural graphite at a mass ratio of 0.5:10, then add it to the coating ax and stir, then heat up to 350 °C at 1.5 °C / min, and keep the temperature for 120 min. Carbonization to obtain coatings;

[0055] (2) Add the coating agent 2 petroleum asphalt powder to the coated ax in step (1), and fully stir and mix according to the mass ratio of petroleum asphalt powder and natural graphite as 1:10, and then press 3.5°C / min The heating rate is raised to 400°C, and the thermal polycondensation reaction is carried out at a constant temperature of 400°C, and finally the temperature is raised to 580°C for 60 minutes to obtain a complex; the polymerization pressure of the thermal polycondensation reaction is 10MPa, and the reaction time of the thermal polycondensation reaction 60min;

[0056] (3) In an inert gas, carbonize t...

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Abstract

The invention discloses a graphite negative electrode material of a lithium ion battery and a preparation method for the graphite negative electrode material. The preparation method comprises the following steps of (1) heating a mixture of a macromolecular material and natural graphite according to a rate of 0.5-1.5 DEG C per minute to the temperature of 200-350 DEG C in inert gas atmosphere, and preserving the temperature for 80-200 minutes to obtain a wrapping body; (2) mixing the wrapping body and an asphalt carbon precursor to obtain a mixture, heating the mixture to the temperature of 380-450 DEG C according to the heating rate of 2.5-3.5 DEG C per minute, performing retrogressive reaction for 60-200 minutes under a condition of constant temperature, heating to the temperature of 580-620 DEG C, and keeping the temperature for 30-60 minutes to obtain a composite body; and (3) performing carbonization treatment on the composite body under the temperature of 600-1,500 DEG C. The lithium ion battery prepared from the graphite material prepared by the preparation method disclosed by the invention is excellent in circulating performance, high in low-temperature property and high in charging and discharging efficiency.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] With the development of science and technology, electronic products and energy vehicles pay more attention to energy density and high power, especially energy vehicles have great requirements for high power, that is, fast charging and discharging. Therefore, some anode materials with high power and high energy density have been extensively studied. At present, the negative electrode of lithium-ion batteries is mainly graphite material, but graphite material is composed of sheet structure, d002 is small, and the power performance is not as good as amorphous materials such as hard carbon and soft carbon, which leads to the decline of battery charge and discharge performance and cycle performance. . Therefore, the modification of graphite has become a rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/587H01M10/0525C01B32/21C01B32/05
CPCH01M4/1393H01M4/583H01M2004/027Y02E60/10
Inventor 刘金峰苗荣荣吴志红丁晓阳胡东山
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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