Method for preparing positive electrode material for lithium ion cell by spraying, combusting and pyrolyzing

A technology for lithium ion batteries and cathode materials, which is applied in the field of preparation of lithium ion cathode materials, can solve the problems of insignificant improvement of the electrochemical properties of cathode materials, difficulty in large-scale continuous industrial production, and difficulty in controlling the morphology of cathode materials. Achieve the effects of excellent processability and electrochemical performance, improved purity, and easy large-scale continuous industrial production

Active Publication Date: 2016-09-07
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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Problems solved by technology

Among them, the preparation of positive electrode materials by high-temperature solid-state reaction method is difficult to control the morphology of the synthesized positive electrode materials because the mixing of raw materials is not uniform enough, the size of the materials is large, the particle size distribution is uneven, and impurities will be introduced in the process of mixing and grinding. , the improvement of the electrochemical performance of the cathode material is not obvious
Different from the high-temperature solid-state reaction method, the components of the liquid-phase precipitation method and the sol-gel method can achieve intermolecular mixing, which solves the problem of uneven mixing in the high-temperature solid-state reaction method. At the same time, the morphology of the synthesized powder is controllable. The grain size is small and the particle size distribution range is narrow, but the precipitation method and the gel-sol method have the disadvantages of complicated preparation process, many steps, a large amount of solvent and high production cost, and it is difficult to realize large-scale continuous industrial production

Method used

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  • Method for preparing positive electrode material for lithium ion cell by spraying, combusting and pyrolyzing
  • Method for preparing positive electrode material for lithium ion cell by spraying, combusting and pyrolyzing
  • Method for preparing positive electrode material for lithium ion cell by spraying, combusting and pyrolyzing

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preparation example Construction

[0038] Further, the preparation method may further comprise the steps:

[0039] S3, recover the tail gas produced by the pyrolysis furnace.

[0040] Specifically, the tail gas can be absorbed and purified by the tail gas absorption device to produce by-products such as nitric acid, sulfuric acid and hydrochloric acid, which can effectively control the pollution discharge and improve the profit at the same time.

Embodiment 1

[0042] Lithium nitrate, nickel nitrate, cobalt nitrate and aluminum nitrate were dissolved in absolute ethanol in the ratio of Li:Ni:Co:Al=1.1-1.2:0.85:0.1:0.05 for high-speed stirring for 30 minutes, and then sonicated for 10 minutes. High-speed agitation and ultrasonic circulation for 3 times in turn to form a mixed slurry precursor, wherein the total concentration of metal ions is 7mol / L; the above-mentioned slurry is sprayed vertically from the upper part of the pyrolysis furnace at a speed of 500kg / h. Pyrolysis or combustion in the pyrolysis furnace, and at the same time, oxygen is injected horizontally at the bottom of the pyrolysis furnace along the tangential direction of the furnace wall, so that the lithium source and the metal compound are pyrolyzed or burned to form LiNi 0.85 Co 0.1 Al 0.05 O 2 , wherein the temperature of the pyrolysis furnace is controlled at 700°C.

[0043] Please refer to Figure 2-3 , the electrochemical performance test of the obtained po...

Embodiment 2

[0045] Lithium nitrate and cobalt nitrate are dissolved in water according to the ratio of Li:Co=1.1-1.2:1, stirred at high speed for 30 minutes, then ultrasonicated for 10 minutes, followed by high-speed stirring and ultrasonic cycles for 3 times to form a mixed slurry precursor, wherein The total concentration of metal ions is 5mol / L; the above-mentioned slurry is sprayed vertically into the pyrolysis furnace at a speed of 450kg / h from the upper part of the pyrolysis furnace for pyrolysis or combustion, and at the same time, along the bottom edge of the pyrolysis furnace. Oxygen is injected horizontally in the tangential direction of the furnace wall, so that the lithium source and the metal compound undergo pyrolysis or combustion to form LiCoO 2 , wherein the temperature of the pyrolysis furnace is controlled at 750°C.

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Abstract

The invention provides a method for preparing a positive electrode material for a lithium ion cell by spraying, combustion and pyrolyzing. The method comprises the following steps of S1, proportionally adding a lithium source and a metal compound into a solvent and mixing them well, thus forming a mixed slurry precursor; and S2, spraying the mixed slurry precursor into a pyrolyzing furnace in a manner of spray, thus pyrolyzing or combusting the lithium source and the metal compound to form the required positive electrode material for the lithium ion cell, wherein the temperate of the pyrolyzing furnace is controlled to be 650-850 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion positive electrode material, in particular to a method for preparing a lithium ion battery positive electrode material by spray combustion pyrolysis. Background technique [0002] As a new generation of green power sources, lithium-ion batteries have the advantages of high energy density, high voltage, low self-discharge, and no memory effect. They are widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles and electric vehicles. . With the rapid development of electronic products, the energy and power requirements of lithium-ion batteries are getting higher and higher, and the cathode material of lithium-ion batteries is an important part of lithium-ion batteries and the main factor affecting the performance of lithium-ion batteries. [0003] At present, the methods for synthesizing cathode materials for lithium-ion batteries mainly include high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCH01M4/48H01M10/0525Y02E60/10
Inventor 赵斌毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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