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

A technology for lithium-ion batteries and positive electrode materials, which is applied in the fields of chemical industry and lithium-ion battery materials. It can solve the problems of affecting the electrochemical performance of positive electrode materials and the inability to realize continuous production of efficient and controllable metal oxide coating, and achieve the goal of overcoming the difficulty of fine powder. Effects of fluidization, good economic and social benefits, and short reaction time

Active Publication Date: 2021-10-22
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

[0009] The effect of metal oxide coating directly affects the electrochemical performance of positive electrode materials. Summarizing the existing metal oxide coating technologies for positive electrode materials, no matter whether it is liquid phase mixing combined with sintering, mechanical ball milling mixing or traditional chemical vapor deposition, it is impossible to achieve high efficiency. Controlled continuous production of metal oxide coating

Method used

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

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Effect test

Embodiment 1

[0032] A metal oxide coating modification system for lithium-ion battery positive electrode materials

[0033] Such as figure 1 As shown, the system includes a silo 1, a screw feeder 2, a feed valve 3, a fluidized bed reactor 4, a discharge valve 5, a product cooler 6, a product collector 7, and a burner 8 connected in sequence , reaction carrier gas preheater 9, reaction raw material generator 10, reaction raw material nozzle 11, fluidized carrier gas preheater 12, primary cyclone separator 13, secondary cyclone separator 14, bag filter 15 and hydrochloric acid Exhaust gas absorber 16;

[0034] 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 feed valve 3, and the feed valve The discharge port of 3 is connected with the feed port of fluidized bed reactor 4, and the gas inlet of described fluidized bed reactor 4 is connected with the gas outlet of fluidi...

Embodiment 2

[0036] A method for metal oxide coating modification of lithium ion battery cathode material:

[0037] The method for coating and modifying metal oxides includes the following steps: the positive electrode material powder enters the fluidized bed reactor 4 from the silo 1 through the screw feeder 2 and the feed valve 3 to stay for a certain period of time, and passes through the primary cyclone Separator 13, secondary cyclone separator 14 and bag dust collector 15 collect and return to fluidized bed reactor 4; after being discharged from the discharge port of fluidized bed reactor 4, it enters the product cooler through discharge valve 5 6 for cooling, and enter the product collector 7 after cooling;

[0038] After the coal gas is heated by the burner 8, heat is exchanged through the reaction carrier gas preheater 9 and the fluidized carrier gas preheater 12 to preheat the gas, and the discharged gas is directly discharged as waste gas; the carrier gas and water are sent into ...

Embodiment 3

[0040] Using the coating process described in Example 2, the ternary nickel cobalt lithium manganese oxide material enters the fluidized bed reactor 4 from the silo 1 through the screw feeder 2 and the feed valve 3, and is preheated by the reaction carrier gas The nitrogen temperature behind the reactor 9 is 120°C, enters the reaction material generator 10 to heat the reaction material trimethylaluminum, and enters the fluidized bed reactor 4 through the reaction material nozzle 11 together with the trimethylaluminum vapor, and at the same time, another nitrogen gas passes through After the fluidized carrier gas preheater 12 is preheated, it forms a mixed gas with water vapor and enters the fluidized bed reactor 4, wherein the mass ratio of water vapor to trimethylaluminum is 1:2, and the two gases react in the fluidized bed A gas phase hydrolysis reaction occurs in the device 4, and metal oxides are deposited on the surface of the positive electrode material powder particles. ...

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Abstract

The invention relates to a system and method for coating and modifying metal oxides of positive electrode materials of lithium ion batteries. The system mainly includes a feed bin, a screw feeder, a feed valve, a fluidized bed reactor, a discharge valve, and a product Cooler, product collector, burner, reaction carrier gas preheater, reaction raw material generator, reaction raw material nozzle, fluidized carrier gas preheater, primary cyclone separator, secondary cyclone separator, bag dust collector and a hydrochloric acid tail gas absorber are formed according to a predetermined combination; the method is based on the metal oxide coating modification method of the system, and the metal oxide-coated cathode composite powder is obtained by fluidized chemical vapor deposition. The invention has the advantages of high coating efficiency, simple and controllable process, low cost, etc., is suitable for large-scale industrial production of metal oxide-coated modified cathode materials for lithium ion batteries, and has good economic and social benefits.

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 coating and modifying metal oxides of lithium-ion battery cathode materials. Background technique [0002] In recent years, with the rapid development of new energy vehicles, people have put forward higher requirements for the performance of lithium-ion power batteries. As the core component of lithium-ion batteries, electrode materials determine the performance of lithium-ion batteries. Compared with the mature and stable commercial graphite anode, it is particularly urgent to develop cathode materials with high capacity, long life, low cost, safety and environmental protection. The current commercial lithium-ion battery cathode materials mainly include layered lithium cobaltate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate. Among them, ternary materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/24H01M4/36H01M4/48H01M4/525H01M4/58H01M10/0525
CPCB01J8/1827B01J8/1872B01J8/24H01M4/366H01M4/48H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 吕鹏鹏朱庆山李欣鑫史和邦
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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