Graphite negative electrode material of lithium-ion battery and preparation method of graphite negative electrode material

A lithium-ion battery and graphite negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle performance and low primary charge capacity, and achieve good cycle performance, excellent cycle performance, and increased cycle performance.

Inactive Publication Date: 2017-03-15
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-density graphite battery negative electrode material with simple process, high discharge capacity and high discharge stability and a preparation method thereof, to overcome the problems of low cycle performance and primary charge capacity of existing artificial graphite materials, and Provided is a lithium-ion battery graphite negative electrode material and a preparation method thereof

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  • Graphite negative electrode material of lithium-ion battery and preparation method of graphite negative electrode material

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Embodiment 1

[0026] The preparation method of the present embodiment comprises the following steps:

[0027] (1) Mix an artificial graphite raw material with a certain amount of binder and catalyst SiC (content ≥ 92%) at a ratio of 100:6:5. When mixing, it is required to feed materials in a certain order according to the specific gravity of the material , Mixing time 30 ~ 60min.

[0028] (2) In an inert gas, put the material mixed in step (1) into a low-temperature surface modification reaction kettle, and stir while heating up. The frequency of stirring should make the material even, generally controlled at 28-40r / min , The heating time is 180-240min, the temperature is raised to 500-650°C, and the temperature is kept constant for 180-260min to obtain the clad body.

[0029] (3) The clad body in step (2) is subjected to graphitization treatment at 2000-2800° C. for 50-70 hours.

[0030] (4) Put the graphitized coated body and a certain amount of binder in the step (3) into the fusion eq...

Embodiment 2

[0033] The preparation method of the present embodiment comprises the following steps:

[0034] (1) Mix an artificial graphite raw material with a certain amount of binder and catalyst SiC (content ≥ 92%) at a ratio of 100:10:5. When mixing, it is required to feed materials in a certain order according to the specific gravity of the material , Mixing time 30 ~ 60min.

[0035] (2) In an inert gas, put the material mixed in step (1) into a low-temperature surface modification reaction kettle, and stir while heating up. The frequency of stirring should make the material even, generally controlled at 28-40r / min , The heating time is 180-240min, the temperature is raised to 500-650°C, and the temperature is kept constant for 180-260min to obtain the clad body.

[0036] (3) The clad body in step (2) is subjected to graphitization treatment at 2000-2800° C. for 50-70 hours.

[0037] (4) Put the graphitized coated body and a certain amount of binder in the step (3) into the fusion e...

Embodiment 3

[0040] The preparation method of the present embodiment comprises the following steps:

[0041] (1) Mix an artificial graphite raw material with a certain amount of binder and catalyst SiC (content ≥ 92%) at a ratio of 100:12:5. When mixing, it is required to feed materials in a certain order according to the specific gravity of the material , Mixing time 30 ~ 60min.

[0042] (2) In an inert gas, put the material mixed in step (1) into a low-temperature surface modification reaction kettle, and stir while heating up. The frequency of stirring should make the material even, generally controlled at 28-40r / min , The heating time is 180-240min, the temperature is raised to 500-650°C, and the temperature is kept constant for 180-260min to obtain the clad body.

[0043] (3) The clad body in step (2) is subjected to graphitization treatment at 2000-2800° C. for 50-70 hours.

[0044] (4) Put the graphitized coated body and a certain amount of binder in the step (3) into the fusion e...

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Abstract

The invention discloses a graphite negative electrode material of a lithium-ion battery and a preparation method of the graphite negative electrode material. The method comprises the steps of mixing an artificial graphite raw material with a binder and a catalyst SiC (the content is greater than 92%) at the mass ratio of 100:(6-12):(3-8) during preparation, putting the evenly mixed materials into a low-temperature surface modification reaction kettle in an inert gas and carrying out warming and stirring to obtain a coated body; carrying out graphitization treatment on the coated body; and fusing the coated body subjected to graphitization treatment and the binder at the mass ratio of 100:(2-6) to prepare a fusion body and carrying out carbonizing treatment on the fusion body in the inert gas to obtain the graphite negative electrode material of the lithium-ion battery. According to the prepared graphite negative electrode material of the lithium-ion battery, the initial discharge capacity is not smaller than 355mAh/g; the initial charge-discharge efficiency is greater than 92.0%; the graphite negative electrode material has the advantages of high electric capacity, low irreversible capacity and very good and stable battery cycle performance, especially has great advantages in a low-temperature cycle, and is used as the negative electrode material of the lithium-ion battery and the like.

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 its advantages of high specific energy, high working voltage, fast charging and discharging, long cycle life, safety and pollution-free, lithium-ion batteries have successfully replaced other secondary batteries and become the standard for small electronic products such as mobile phones, notebook computers and video recorders. The main energy source, and greatly promoted the industrialization process of electric vehicles, many countries have also fully started the development of lithium-ion batteries in the military and aerospace fields, which put forward higher requirements for lithium-ion batteries. [0003] With the development of science and technology, electronic products and energy vehicles pay more attention to energy density and high power, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/583H01M10/0525Y02E60/10
Inventor 顾凯杜辉玉丁晓阳王弘奇池淑芬李惊蛰李虹
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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