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Granular carbon positive electrode and preparation method and application thereof

A technology of granular carbon and positive electrode, applied in the field of granular carbon positive electrode and its preparation, can solve the problems of long preparation process, removal of excess solvent, long process process, etc., to save cost, save mixing time, and improve shot blasting uniformity. Effect

Active Publication Date: 2021-11-02
HUBEI JINQUAN NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its described method preparation process flow is long, energy consumption is big, and process is loaded down with trivial details
[0005] The above scheme has the problems of long process flow, high energy consumption or need to remove excess solvent. Therefore, the development of a process is simple, time-consuming and does not need to remove excess solvent The preparation method of the granular carbon cathode of the solvent is very necessary

Method used

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  • Granular carbon positive electrode and preparation method and application thereof
  • Granular carbon positive electrode and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0044] This embodiment provides a method for preparing a granular carbon positive electrode, the preparation method adopts such as figure 1 The screw extruder shown and as figure 2 The shown shot blasting machine is prepared, and the screw extruder includes a screw, and one end of the screw is an extrusion hole 5, and the screw is provided with a feeding system 2, a temperature control system 3 and a vacuum system 4, so that The feeding system includes an independent first feeding bin and a second feeding bin, and the screw extruder also includes a drive system 1 connected with the screw;

[0045] The shot blasting machine includes a turntable 10 and a heating device 9 positioned below the turntable 10;

[0046] The concrete steps of described preparation method are as follows:

[0047] (1) Add 97.4kg of carbon black powder and 0.5kg of copper powder into the first feeding bin 6 of the screw extruder, initially pre-mix the carbon powder and copper powder, revolutionize 10rp...

Embodiment 2

[0051] This embodiment provides a method for preparing a granular carbon positive electrode. This embodiment uses the same screw extruder and shot blasting machine as in Embodiment 1. The specific steps of the preparation method are as follows:

[0052] (1) Add 97.38kg of carbon black powder and 0.52g of copper powder into the first feeding bin 6 of the screw extruder, pre-mix the carbon powder and copper powder, rotate at 9rpm, disperse at 210rpm, mix and stir for 11min to obtain mixed powder material;

[0053] (2) Add 9.99g of water, 10.01g of carbon nanotube slurry and 4.02g of polytetrafluoroethylene emulsion into the second feeding bin 7 of the screw extruder, mix and stir, press 16rpm of revolution, disperse at 500rpm, and stir for 9min to obtain mixed slurry;

[0054] (3) Turn on the drive system 1, after vacuuming the vacuum system 4, turn on the screw circulating cooling water of the temperature control system 3 to keep the temperature in the screw cavity at 25°C, tu...

Embodiment 3

[0056] The only difference between this embodiment and embodiment 1 is that the flow rate of the first feeding bin 6 is 15 L / min, and other conditions and parameters are exactly the same as those of embodiment 1.

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Abstract

The invention provides a granular carbon positive electrode and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing carbon material powder and copper powder to obtain mixed powder; (2) mixing a solvent, conductive agent slurry and a binder emulsion to obtain mixed slurry; and (3) carrying out screw extrusion on the mixed powder obtained in the step (1) and the mixed slurry obtained in the step (2), and carrying out shot blasting and drying treatment to obtain the granular carbon positive electrode. According to the invention, the powder stirring process is optimized, the stirring time is saved, the slurry dehydration process is omitted, the cost is saved, and the shot blasting uniformity of the carbon granular positive electrode is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a granular carbon positive electrode and a preparation method and application thereof. Background technique [0002] At present, domestic and foreign preparation methods for granular carbon cathodes of lithium-ion batteries generally add active materials, conductive agents, binders, solvents, etc. to a traditional double planetary mixer to prepare slurry, and then remove most of the slurry. The solvent is mixed semi-dry and wet solute, and the mixed solute is extruded into strips through a granulator, and then shot blasted by a shot blasting machine to form semi-dry and wet round particles. [0003] CN101803065B discloses a primary battery having an anode comprising lithium and an anode comprising iron disulfide (FeS 2 ) with a cathode of carbon particles. The electrolyte contains a lithium salt dissolved in a solvent mixture. Iron disulfide powder is preferably premixed wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/133H01M4/1393H01M10/0525
CPCH01M4/04H01M4/133H01M4/1393H01M10/0525Y02E60/10
Inventor 方杰雄
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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