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A device and method for carbon coating modification of negative electrode material of lithium ion battery

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc.

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 has shown 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 anode materials.

Method used

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  • A device and method for carbon coating modification of negative electrode material of lithium ion battery
  • A device and method for carbon coating modification of negative electrode material of lithium ion battery
  • A device and method for carbon coating modification of negative electrode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0039] A system for carbon coating and modification of negative electrode materials for lithium-ion batteries

[0040] like 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;

[0041] 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 d...

Embodiment 2

[0044] A method for carbon coating modification of lithium ion battery negative electrode material

[0045] The method for carbon coating modification includes the following steps: the negative 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 reac...

Embodiment 3

[0048]Using the modification process described in Example 2, the silicon material is preheated in the fluidized bed powder preheater 4 from the silo 1 through the screw feeder 2 and the preheater feed valve 3, and the preheating temperature is The temperature is 900°C, and the preheating time is 10 minutes. The preheated material powder enters the fluidized bed reactor 6 through the reactor feed valve 5, and the mixed gas of methane / argon (the volume concentration of methane is 25%) passes through the mixed gas. In the preheater 10, the preheated mixed gas is uniformly fed into the bottom inlet of the fluidized bed reactor 6, so that the silicon powder in the fluidized bed reactor 6 is in a fluidized state. In the fluidized bed, the mixed gas is in full contact with the silicon powder, the operating temperature of the fluidized bed reactor 6 is controlled at 1200° C., and the residence time of the silicon powder in the fluidized bed is 10 minutes. The reacted silicon powder fl...

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Abstract

The invention relates to a system and a method for carrying out carbon coating modification on an anode material of a lithium ion battery. The system is mainly formed by a material cabin, a spiral feeder, a preheater material inlet valve, a fluidized bed powder preheater, a reactor material inlet valve, a fluidized bed reactor, a reactor material outlet valve, a product cooler, a product collector, a mixed gas preheater, a first-stage reaction tail gas cyclone separator, a second reaction tail gas cyclone separator, a reaction tail gas bag collector, a reaction tail gas combustor, 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. The method is a carbon coating method based on the system, and carbon coated anode composite powder is obtained through fluidized chemical vapor deposition. The system and the method, disclosed by the invention, have the advantages that the coating efficiency is high, the technology is simple and controllable, the cost is low, and the like, are suitable for large-scale industrial production of carbon coated modified anode materials of the lithium ion battery and have good economic benefit and good social benefit.

Description

technical field [0001] The invention belongs to the field 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 negative electrode 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. In actual use, traditional lithium-ion battery anode materials, such as carbon-based, silicon-based and lithium titanate, have some problems. The lithium ion migration rate of carbon-based graphite is low, which is not suitable for high-current charging and discharging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 吕鹏鹏朱庆山
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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