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A kind of preparation method of nickel-cobalt lithium manganese oxide for coated power battery

A nickel-cobalt lithium manganese oxide and power battery technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the coating material reduces the specific capacity of the positive electrode material, the coating has obvious limitations, and the coating material is easy to fall off. , to achieve the effect of good coating stability, improved performance, and not easy to fall off

Active Publication Date: 2020-01-07
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of mechanical mixing, it is difficult to achieve a comprehensive and uniform coating on the entire particle of the positive electrode material. When the amount of coating material is increased, the specific capacity of the positive electrode material will be significantly reduced.
At the same time, because the coating material and the positive electrode material are mechanically attached and fixed, the combination of the two is not firm, and the coating material is easy to fall off.
The limitations of traditional solid-phase coating are obvious

Method used

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  • A kind of preparation method of nickel-cobalt lithium manganese oxide for coated power battery
  • A kind of preparation method of nickel-cobalt lithium manganese oxide for coated power battery
  • A kind of preparation method of nickel-cobalt lithium manganese oxide for coated power battery

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preparation example Construction

[0032] A preparation method of nickel-cobalt lithium manganese oxide for coated power batteries, comprising the following steps:

[0033] 1) preheating the nickel cobalt lithium manganese oxide particles;

[0034] 2) heating the metal to be coated to boiling under an inert gas atmosphere to obtain metal vapor;

[0035] 3) using an inert gas to blow the nickel cobalt lithium manganese oxide particles obtained by preheating in step 1) to the pyrolysis furnace, and simultaneously blowing the metal vapor obtained in step 2) to the pyrolysis furnace for reaction with an inert gas;

[0036] 4) The particles obtained after the reaction in step 3) are sent to the mixer through an inert gas, and mixed with an oxygen-containing mixed gas to form a solid-gas mixture;

[0037] 5) The solid-gas mixture is sent to a pyrolysis furnace for reaction to obtain a coated nickel-cobalt lithium manganate cathode material.

[0038] Preferably, in step 1) of the preparation method, the particle siz...

Embodiment 1

[0054] A preparation method of coated nickel-cobalt lithium manganese oxide comprises the following specific steps:

[0055] (1) It will be sintered once and crushed to particle size D 50 Preheat to 450 °C for 2 μm nickel cobalt lithium manganese oxide.

[0056] (2) Heat metal aluminum to boiling under argon atmosphere.

[0057] (3) Blow the preheated nickel-cobalt lithium manganese oxide (1) into the double nozzle pyrolysis furnace with argon gas, and at the same time blow the aluminum metal vapor obtained from (2) into the furnace from another nozzle with argon gas , the furnace temperature is controlled to be 500°C, the residence time of particles in the furnace is 1s, and the amount of metal coating (mass percentage in terms of metal elements) is controlled to be 0.05%.

[0058] (4) Gained particle is sent to mixer from double-nozzle pyrolysis furnace under argon atmosphere, and particle mixes with oxygen-argon gas mixture (oxygen concentration is 20ppm) in mixer before se...

Embodiment 2

[0064] A preparation method of coated nickel-cobalt lithium manganese oxide comprises the following specific steps:

[0065] (1) It will be sintered once and crushed to particle size D 50 Preheat the 10 μm nickel-cobalt-lithium manganese oxide to 800 °C.

[0066] (2) Metal magnesium is heated to boiling under an argon atmosphere.

[0067] (3) Blow the preheated nickel-cobalt lithium manganese oxide (1) into the double-nozzle pyrolysis furnace with argon gas, and simultaneously blow the magnesium metal vapor obtained from (2) into the furnace from another nozzle with argon gas , the furnace temperature is controlled to be 900° C., the residence time of particles in the furnace is 10 min, and the amount of metal coating (mass percentage in terms of metal elements) is controlled to be 0.1%.

[0068] (4) Gained particle is sent to mixer from double-nozzle pyrolysis furnace under argon atmosphere, and particle mixes with oxygen-argon gas mixture (oxygen concentration is 10ppm) in...

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Abstract

The invention discloses a preparation method of lithium nickel cobalt manganate for coated power battery. The method comprises the following steps: 1) preheating the lithium nickel cobalt manganate particles; 2) heating the metal to be coated to boiling under an inert gas atmosphere to obtain metal vapor; 3) blowing the preheated lithium nickel cobalt manganate particles into a pyrolysis furnace with an inert gas, and simultaneously blowing metal vapor into the pyrolysis furnace for reaction with the inert gas; 4) the obtained particles are sent to a mixer through an inert gas, and mixed withan oxygen-containing mixed gas to form a solid-gas mixture; 5) the solid-gas mixture is sent to a pyrolysis furnace for reaction. The invention adopts the method of molten metal vapor to coat the lithium nickel cobalt manganate, the metal particles can be uniformly adhered on the surface of the lithium nickel cobalt manganate particles by the fine particles, the coating of the ultra-thin layer isrealized, the molten metal is firmly combined with the cathode material, is not easy to fall off, the coating stability is good, and the performance of the lithium nickel cobalt manganate cathode material can be remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of nickel-cobalt lithium manganese oxide for coated power batteries. Background technique [0002] According to the data from the Ministry of Industry and Information Technology, in 2017, the production and sales of new energy vehicles in my country were close to 800,000, reaching 794,000 and 777,000 respectively, a year-on-year increase of 53.8% and 53.3% respectively. Driven by the new energy vehicle industry, the power battery industry has gained momentum. improve dramatically. [0003] Lithium-ion batteries are widely used in power batteries due to their advantages such as high platform voltage, high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection. Nickel cobalt lithium manganese oxide has high specific capacity, high energy density and power density, and its stable performance has gradually become the mainstream cathode material for power batteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525H01M4/38
CPCH01M4/366H01M4/38H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 谢英豪欧彦楠余海军李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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