Preparation method of high-rate natural graphite negative electrode material

A natural graphite and graphitization technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as damage to lithium ion mobility, reduced charge and discharge efficiency, accelerated electrolyte reaction, etc., to achieve simple and feasible preparation methods and product properties. Stable and safe effect

Inactive Publication Date: 2018-04-03
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] When the graphite anode material is used at a high rate, the problem is that due to the exfoliation of graphite flakes, more surface area to react with the electrolyte is exposed, which accelerates the reaction with the electrolyte, resulting in a decrease in charge and discharge efficiency.
[0008] In addition, due to the high rate, the particles are easy to fall off, and the space serving as the lithium ion channel in the electrode is reduced, which damages the lithium ion mobility, resulting in a decrease in the rate characteristic.

Method used

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  • Preparation method of high-rate natural graphite negative electrode material
  • Preparation method of high-rate natural graphite negative electrode material
  • Preparation method of high-rate natural graphite negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0030] Raw material preparation:

[0031] Spherical natural graphite: 200kg;

[0032] Binder capable of graphitization: petroleum pitch powder crushed to less than 0.1mm, 60kg;

[0033] Graphitization catalyst: SiO 2 , 16kg;

[0034] (1), the spherical natural graphite in the above raw materials is pretreated into 20 μm natural graphite powder through classified ultrafine grinding;

[0035] (2), under stirring, add natural graphite powder and SiO alternately 2 Mix well, then mix with petroleum asphalt powder into the kneading pot;

[0036] (3) Carry out kneading treatment at 160° C. for 1 hour to obtain a shaped body of the kneaded product;

[0037] (4), the shaped body of the kneaded compound is pressed into a sheet of 4mm in a tablet press, then pulverized into particles with a particle size of less than 100 μm, and hot isostatically pressed into a block; the temperature of the hot isostatic pressing is 800 ℃, the pressure is 750MPa, and the time is 5 hours;

[0038] ...

Embodiment 2

[0040] Raw material preparation:

[0041] Spherical natural graphite: 200kg;

[0042] Graphitizable binder: petroleum asphalt powder crushed to less than 0.1mm, 20kg;

[0043] Graphitization catalyst: SiC, 6kg;

[0044] (1), the spherical natural graphite in the above raw materials is pretreated into 20 μm natural graphite powder through classified ultrafine grinding;

[0045] (2) Under stirring, alternately add natural graphite powder and SiC to mix evenly, and then mix with petroleum pitch powder in a kneading pot;

[0046] (3) Carry out kneading treatment at 160° C. for 1 hour to obtain a shaped body of the kneaded product;

[0047] (4), the shaped body of the kneaded compound is pressed into a sheet of 3mm in a tablet press, then pulverized into particles with a particle size of less than 100 μm, and hot isostatically pressed into a block; the temperature of the hot isostatic pressing is 800 ℃, the pressure is 100MPa, and the time is 1 hour;

[0048] (5), carry out 48...

Embodiment 3

[0050] Raw material preparation:

[0051] Spherical natural graphite: 200kg;

[0052] Binder capable of graphitization: coal tar pitch powder crushed to less than 0.1mm, 100kg;

[0053] Graphitization catalyst: SiO 2 , 10kg;

[0054] (1), the spherical natural graphite in the above-mentioned raw materials is pretreated into 20 μm natural graphite powder through classified ultrafine grinding;

[0055] (2), under stirring, add natural graphite powder and SiO alternately 2 Mix evenly, then mix with coal tar pitch powder into the kneading pot;

[0056] (3) Carry out kneading treatment at 160° C. for 1 hour to obtain a shaped body of the kneaded product;

[0057] (4), the shaped body of the kneaded compound is pressed into a sheet of 5mm in a tablet press, then pulverized into particles with a particle size of less than 100 μm, and hot isostatically pressed into a block; the temperature of the hot isostatic pressing is 1000 ℃, the pressure is 50MPa, and the time is 10 hours;

...

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Abstract

The invention relates to the technical field of a graphite negative electrode material, specifically to a preparation method of a high-rate natural graphite negative electrode material. The method comprises: (1) super fine grinding pretreatment; (2) mixing; (3) heating and kneading; (4) hot isostatic pressing treatment; and (5) catalytic graphitization high-temperature treatment, and then a graphite negative electrode material is prepared. Compared with a method in the prior art, the preparation method is simple and feasible and is suitable for industrial production. The prepared graphite negative electrode material is high in charge and discharge rate and good in cycle performance, and a button cell made from the graphite negative electrode material is excellent in overall performance.

Description

technical field [0001] The invention relates to the technical field of graphite negative electrode materials, in particular to a preparation method of high-magnification natural graphite negative electrode materials. Background technique [0002] In recent years, as the functions of electronic devices have diversified, there has been an increasing demand for higher-rate secondary batteries. Of particular interest are lithium-ion batteries, which offer higher power densities compared to nickel-cadmium or nickel-metal hydride batteries. Although extensive research has been carried out on increasing the battery rate, as the performance requirements of the battery increase, the battery power needs to be further increased. [0003] Natural graphite has a very high capacitance (>350mAh / g), but the disadvantage is that the structure is unstable. When charging and discharging with a large current, the graphite negative electrode particles are easy to fall off and peel off. Due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/583Y02E60/10
Inventor 谢秋生丁晓阳仲林陈然
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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