A system and method for carbon coating and modification of positive electrode materials for lithium-ion batteries

A technology for lithium-ion batteries and cathode materials, which is applied in the fields of chemical industry and lithium-ion battery materials, and can solve problems such as lack of

Active Publication Date: 2020-10-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluidized bed chemical vapor deposition technology shows advantages in carbon coating of powder materials. However, there is still a lack of related technologies based on fluidized bed chemical vapor deposition technology that can be implemented specifically for carbon coating of lithium ion battery cathode materials.

Method used

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  • A system and method for carbon coating and modification of positive electrode materials for lithium-ion batteries
  • A system and method for carbon coating and modification of positive electrode materials for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A system for carbon coating and modification of cathode materials for lithium-ion batteries

[0036] Such as figure 1 As shown, the device system includes sequentially connected silo 1, screw feeder 2, preheater feed valve 3, fluidized bed powder preheater 4, reactor feed valve 5, fluidized bed reaction 6, reactor discharge valve 7, product cooler 8, product collector 9, mixed gas preheater 10, primary reaction tail gas cyclone separator 11, secondary reaction tail gas cyclone separator 12, reaction tail gas bag dust collection Device 13, reaction exhaust gas burner 14, primary preheating exhaust gas cyclone separator 15, secondary preheating exhaust gas cyclone separator 16, preheating exhaust gas bag filter 17 and preheating exhaust gas cooler 18;

[0037] The discharge port of the silo 1 is connected with the feed port of the screw feeder 2, and the discharge port of the screw feeder 2 is connected with the feed port of the preheater feed valve 3, the The discharge...

Embodiment 2

[0040] A method for carbon coating modification of positive electrode material of lithium ion battery

[0041] The method for carbon coating modification includes the following steps: the positive electrode material powder enters the fluidized bed powder preheater 4 from the silo 1 through the screw feeder 2 and the preheater feed valve 3 for a certain period of time, Return to the fluidized bed powder preheater 4 after being collected by the primary preheating tail gas cyclone separator 15, the secondary preheating tail gas cyclone separator 16 and the preheating tail gas bag filter 17; After the outlet of the heater 4 is discharged, it enters the fluidized bed reactor 6 through the reactor feed valve 5 and stays for a certain period of time, and passes through the primary reaction tail gas cyclone separator 11, the secondary reaction tail gas cyclone separator 12 and the reaction tail gas cloth bag After being collected by the dust collector 13, return to the fluidized bed r...

Embodiment 3

[0044] Using the modification process described in Example 2, the ternary nickel cobalt lithium manganese oxide material is entered into the fluidized bed powder preheater 4 from the silo 1 through the screw feeder 2 and the preheater feed valve 3 Preheating, the preheating temperature is 250°C, and the preheating time is 10min. The preheated material powder enters the fluidized bed reactor 6 through the reactor feed valve 5, and acetylene / argon (the volume concentration of acetylene is 20%) The mixed gas passes through the mixed gas preheater 10, and the preheated mixed gas is uniformly fed into the inlet of the fluidized bed reactor 6 bottom, so that the ternary nickel cobalt lithium manganate powder in the fluidized bed reactor 6 is in the state of fluidized state. In the fluidized bed, the mixed gas is in full contact with the ternary nickel-cobalt lithium manganese oxide powder, the operating temperature of the fluidized bed reactor 6 is controlled at 400°C, and the resid...

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Abstract

The invention relates to a lithium ion battery anode material carbon-coated modified system and method. The system mainly comprises a material bin, a screw feeder, a preheater feeding valve, a fluidized bed powder preheater, a reactor feeding valve, a fluidized bed reactor, a reactor discharging valve, a product cooler, a product collector, a mixed gas preheater, a first-stage reaction tail gas cyclone separator, a second-stage reaction tail gas cyclone separator, a reaction tail gas bag collector, a reaction tail gas burner, a first-stage preheated tail gas cyclone separator, a second-stage preheated tail gas cyclone separator, a preheated tail gas bag collector and a preheated tail gas cooler according to set combinations; and the method is a carbon-coated method based on the system, andfluidization chemical vapor deposition is carried out to obtain carbon-coated anode composite powder. The system and the method have the advantages that the coating efficiency is high, the technologyis simple and controllable, and the cost is low; and the system and the method are suitable for lithium ion battery carbon-coated modified anode material large-scale industrial production, and the good economic benefit and social benefit are achieved.

Description

technical field [0001] The invention belongs to the fields of lithium ion battery materials and chemical industry, and in particular relates to a system and method for carbon coating modification of lithium ion battery cathode materials. Background technique [0002] Lithium-ion batteries have been widely used in many fields due to their high energy density, long cycle life, no memory effect, safety and environmental protection. In recent years, with the rapid development of electric vehicles, people have put forward higher requirements on the performance of lithium-ion batteries. As the core component of lithium-ion batteries, electrode materials determine the performance of lithium-ion batteries. At present, the positive electrode materials of lithium-ion batteries are mainly transition metal oxide positive electrode materials, such as lithium cobaltate, ternary positive electrode materials, etc., which have high capacity and safety performance. However, when the charging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/26C23C16/442C23C16/455H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCC23C16/26C23C16/442C23C16/455H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 吕鹏鹏朱庆山
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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