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Preparation method of high-performance graphite negative electrode material for lithium ion battery

A lithium-ion battery and graphite negative electrode technology, which is applied in the field of electrodes, can solve the problems of poor processing performance of subsequent electrode pieces, cumbersome preparation methods, and high process costs, and achieve good liquid absorption and liquid retention performance, high-rate charge and discharge performance, and guaranteed The effect of specific capacity

Inactive Publication Date: 2016-07-20
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation method is cumbersome, the process cost is high, and the primary particle size of granulation is too low, resulting in too low tap density, less than 1.0g / cc, which in turn leads to extremely poor processing performance of subsequent pole pieces

Method used

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  • Preparation method of high-performance graphite negative electrode material for lithium ion battery

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Effect test

Embodiment 1

[0016] A preparation method of high-performance graphite negative electrode material for lithium ion battery, comprising the steps of:

[0017] 1) Collect the petroleum coke micropowder in the plastic machine and pulverizer in normal graphite production, and use the petroleum coke micropowder, pulverized expanded graphite powder, mesophase carbon microspheres, and binder at a mass ratio of 1:0.01 :0.7:0.1, put it into the mixing batch machine and mix for 0.5h to form a solid-phase coating mixture, the frequency of the mixing batch machine is 50HZ; the temperature of the graphitization treatment is 3200°C, and the particle size D50 of the petroleum coke micropowder=1 -5um, the expanded graphite powder is mechanically or jet-pulverized powder of expanded graphite, particle size D50=2-10um, ash content less than 0.5%, ph=6-8, mesophase carbon microsphere green ball volatile content is 20% , Ash content is less than 0.5%, particle size D50=10-12um.

[0018] 2) The solid-phase coa...

Embodiment 2

[0020] A preparation method of high-performance graphite negative electrode material for lithium ion battery, comprising the steps of:

[0021] 1) Collect the petroleum coke micropowder in the plastic machine and pulverizer in normal graphite production, and use the petroleum coke micropowder, pulverized expanded graphite powder, mesophase carbon microspheres, and binder at a mass ratio of 1:0.3 :1.5:0.2, put into the mixing batch machine and mix for 3h to form a solid-phase coating mixture, the mixing batch machine frequency is 30HZ; the temperature of the graphitization treatment is 2700°C, and the particle size D50 of the petroleum coke micropowder=1- 5um, the expanded graphite powder is mechanically or jet-pulverized powder of expanded graphite, particle size D50=2-10um, ash content less than 0.5%, ph=6-8, volatile content of mesophase carbon microspheres is 5%, Ash content is less than 0.5%, particle size D50=10-12um.

[0022] 2) The solid-phase coating mixture obtained ...

Embodiment 3

[0024] A preparation method of high-performance graphite negative electrode material for lithium ion battery, comprising the steps of:

[0025] 1) Collect the petroleum coke micropowder in the plastic machine and pulverizer in normal graphite production, and use the petroleum coke micropowder, pulverized expanded graphite powder, mesocarbon microspheres, and binder at a mass ratio of 1:0.2 :1.1:0.2, put it into a batch mixer and mix for 1.5h to form a solid-phase coating mixture, the frequency of the batch mixer is 40HZ; the temperature of the graphitization treatment is 3000°C, and the particle size D50 of the petroleum coke micropowder=1 -5um, the expanded graphite powder is mechanically or jet-pulverized powder of expanded graphite, particle size D50=2-10um, ash content less than 0.5%, ph=6-8, mesophase carbon microsphere green ball volatile content is 10% , Ash content is less than 0.5%, particle size D50=10-12um.

[0026] 2) The solid-phase coating mixture obtained in st...

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Abstract

The invention discloses a preparation method of a high-performance graphite negative electrode material for a lithium ion battery. The method comprises the following steps of 1) collecting petroleum coke micropowder in a shaper and a grinder in normal graphite production, and mixing the petroleum coke micropowder, ground expanded graphite powder, raw mesocarbon microbeads and an adhesive in a mixer for 0.5-3 hours according to a mass ratio of 1 to (0.01-0.3) to (0.7-1.5) to (0.1-0.2) to form a solid-phase coated mixture, wherein the frequency of the mixer is 30-50HZ; and 2) graphitizing the solid-phase coated mixture obtained in the step 1) to obtain the high-performance graphite negative electrode material for the lithium ion battery. The method is simple and feasible; micropowder wastes in a dust collector are recycled, so that the cost is reduced; the method is easy for large-scale industrial production; and the obtained graphite negative electrode material has the characteristics of high energy density, good liquid absorption and retention performance, good cycle performance, good isotropic performance, good high-rate charge / discharge performance and low expansion rate in a charge / discharge process.

Description

technical field [0001] The invention relates to the technology in the field of electrodes, and in particular provides a method for preparing a high-performance graphite negative electrode material for lithium-ion batteries by using petroleum coke powder in a pulse dust collector. Background technique [0002] In recent years, with the development of mobile communications and portable electronic devices, higher requirements have been placed on the performance of lithium-ion batteries that provide energy. Anode materials have a significant impact on the performance of lithium-ion batteries. Although Si-based, Sn-based and other new high-capacity anodes have been developed in an endless stream, they have not been popularized and applied due to cost and technical factors. At present, graphite-based anode materials still dominate the anode market due to their stable performance, mature technology, and low cost. [0003] At present, one of the important improvement directions of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 宋宏芳赵东辉李芳戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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