Production method of spherical graphite

A technology of spherical graphite and its production method, which is applied in the field of spherical graphite, can solve problems such as changes in the bearing structure of the main engine, influence on the electrochemical performance of spherical graphite, and increase in iron content, and achieve excellent charge-discharge performance and cycle performance, and reduce irreversible capacity loss. The effect of low content of harmful elements

Active Publication Date: 2010-12-08
黑龙江省牡丹江农垦湠奥石墨烯深加工有限公司
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  • Abstract
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Problems solved by technology

During the production process, the material will stay in the lower part of the crushing chamber due to the increase of resistance. The increase of the material in the crushing chamber will hinder the air volume, affect the heat dissipation, and the temperature will rise. changes lead to damage
The bearings used by the main engine are generally imported SKF bearings, which will increase the maintenance cost, decrease the output, and reduce the production efficiency, which will directly affect the smooth production of the crushing and ball making workshop.
[0005] The purification process in the prior art has the following defects: the traditional purification reaction adopts a carbon steel agitator lined with anti-corrosion plastic and uses a motor-driven unidirectional mechanical agitation to mix the materials evenly; The minimum 7.5KW motor needs 7.5 degrees of electricity per hour; the second is that after the agitator is worn out, its anti-corrosion l

Method used

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  • Production method of spherical graphite
  • Production method of spherical graphite
  • Production method of spherical graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The flake graphite with a specification of -100 mesh and a carbon content of 95% is first passed through a 80 mesh sieve, using such as Figure 6 The shown spheroidizing equipment performs spheroidizing and shaping of graphite. Figure 6 The online spheroidization equipment adopts the online mode of the method of the present invention for 18 groups of devices. These 18 groups of devices are arranged in sequence from left to right as Group 1, Group 2, Group 3... Group 18. There is a centralized dust collector between the 6th group device and the 7th group device.

[0074] Groups 1-4 include Roots blower (1), dust collector (2), cyclone separator (3) and pulverizer (4) in turn, wherein the pulverizers (4) in these 4 groups are all ACM60 machines, The grinding blocks on the rotor are all square grinding blocks; the connection between each group of devices is that the feeding port of the cyclone separator of the previous group of devices is connected with the feeding port...

Embodiment 2

[0094] The flake graphite (such as image 3 (shown) pass through a 100-mesh sieve, and then use the spheroidizing equipment consisting of 9 sets of devices arranged in sequence from left to right for spheroidizing and shaping. The on-line mode of the spheroidizing device is: the feeding port of the cyclone separator in the first group device is connected with the feeding port of the pulverizer in the second group device, and the feeding port of the cyclone separator in the second group device is connected with the feeding port of the third group device The feeding port of the pulverizer is connected, and so on, until the ninth group of devices. Among them, the pulverizing machine uses 3 ACM-60 machines, 3 ACM-50 machines and 3 ACM-30 machines sequentially from the first group of devices to the ninth group of devices. The grinding blocks on the rotor of each ACM-30 machine are a combination of square grinding blocks and cylindrical grinding blocks. A square grinding block is ...

Embodiment 3

[0101] Flake graphite with a specification of +100 mesh and a carbon content of 97% first passes through a 50 mesh screen, and then enters the spheroidizing equipment consisting of 6 sets of devices arranged in sequence from left to right for spheroidizing and shaping. The on-line mode of this spheroidizing device is similar to that of embodiment 2, that is, the feeding port of the first group device cyclone separator is connected with the feeding port of the second group device pulverizer, and the feeding port of the second group device cyclone separator is connected with the feeding port of the second group device cyclone separator. The feeding ports of the pulverizers in the third group of devices are connected, and so on, until the sixth group of devices, where the pulverizers use 2 ACM-60 machines, 2 ACM-50 machines and 2 ACM-30 machines in turn. For the grinding blocks on the rotors of the 2 ACM-30 machines, one is a square grinding block and the other is a cylindrical gr...

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Abstract

The invention relates to a production method of spherical graphite, which is characterized in that spheroidizing equipment is used for processing the graphite into sphericity or potato shape with grain size of 10-45mu m; the spheroidizing equipment comprises n groups of devices; each group is formed by connecting a Roots blower, a dust collector, a cyclone separator and a pulverizer in turn; and a discharge outlet of the cyclone separator in the (n-1)th device is connected with a feed inlet of the pulverizer in the nth device. The method dispenses with personnel operation, is higher in yield and efficiency and lower in cost in unit time and realizes automatic closed production of the whole production line. Compared with the prior art, the method is characterized in that the spherical graphite produced by the method has better sphericity, higher tap density, large specific capacity being more than 350mAh/g, small specific area, excellent lithium intercalation and de-intercalation capabilities and cycle stability and 500-cycle capacity-keeping rate being more than 80%.

Description

technical field [0001] The invention relates to a production method of spherical graphite, in particular to a production method for producing spherical graphite used for negative electrode materials of lithium ion batteries in an on-line manner and the spherical graphite produced by the method. Background technique [0002] With the rapid development of economic globalization, the oil crisis and the continuous increase of population, the contradiction of resource shortage has become increasingly prominent, especially today when people pay more and more attention to environmental protection, green power has been developed rapidly. Lithium-ion batteries are a new generation of secondary batteries after nickel-metal hydride batteries since the 1960s. In the past ten years, with the wide application and rapid development of various portable electronic devices and electric vehicles, lithium-ion batteries are characterized by their high reversible capacity, high voltage, high ener...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 赵振宇陈瑞王庆海王景柱
Owner 黑龙江省牡丹江农垦湠奥石墨烯深加工有限公司
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