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A kind of preparation method of alumina-coated lithium-ion battery cathode material

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex coating process, loose coating layer, uneven coating, etc., achieve shortened reaction cycle, cheap price, The process is simple and easy to operate

Active Publication Date: 2020-02-21
XINXIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of the development of existing technologies, the research on the coating of lithium battery cathode materials is more and more extensive, but there are more or less disadvantages such as uneven coating, loose coating layer, complicated coating process, long cycle and high cost.

Method used

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  • A kind of preparation method of alumina-coated lithium-ion battery cathode material
  • A kind of preparation method of alumina-coated lithium-ion battery cathode material
  • A kind of preparation method of alumina-coated lithium-ion battery cathode material

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Embodiment 1

[0030] A high-nickel positive electrode material LiNi coated with alumina for lithium-ion batteries 0.6 mn 0.2 co 0.2 o 2 The preparation method, the steps are as follows:

[0031] (1) Dissolve 10 g of aluminum nitrate in 250 mL of deionized water, add dropwise 0.5 g / mL of sodium hydroxide solution until the pH value is 5.0~5.5, obtain aluminum hydroxide precipitate, filter, wash, and store at 100 °C Dry for 4 hours;

[0032] (2) Dissolve the aluminum hydroxide dried in step (1) in glacial acetic acid at a molar ratio of 1:3 to obtain a colorless transparent solution, and then dilute it to 0.02 g / mL with absolute ethanol (in Al 2 o 3 meter); this step is ready to use;

[0033] (3) Weigh 20 g of high-nickel cathode material into a beaker, add 25 mL of absolute ethanol, and stir under a stirrer;

[0034] (4), press Al 2 o 3 The addition amount is 0.5 wt% metering of the high-nickel cathode material, and the solution obtained in step (2) is added to the solution obtaine...

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Abstract

The invention belongs to the technical field of lithium-ion battery cathode materials, and discloses a method for coating a lithium-ion battery cathode material with aluminum oxide. The method includes the steps: dissolving aluminum hydroxide in glacial acetic acid according to the mole ratio of aluminum hydroxide to glacial acetic acid=1:(3-3.2) to obtain colorless transparent solution, and thenadding absolute ethyl alcohol into the solution to dilute the solution; weighing the lithium-ion battery cathode material, adding the absolute ethyl alcohol and starting stirring; blending the two types of solution; heating the solution and continuously stirring the solution until the solution is volatilized completely; performing drying and heat treatment. The cathode material is coated with thealuminum oxide by the coating method, the aluminum hydroxide is dispersed in the glacial acetic acid and uniformly mixed with the cathode material, the aluminum oxide can be uniformly attached to thesurface of the cathode material in a later period, and the method avoids oversize and non-uniformity of coating particles due to inconsistency of crystalline growth velocity and nucleation rate of coatings and the like in coating with the aluminum hydroxide generated by direct reaction in cathode material solution.

Description

technical field [0001] The invention belongs to the technical field of lithium battery positive electrode materials, and in particular relates to a preparation method of aluminum oxide-coated lithium ion battery positive electrode materials. Background technique [0002] With the rapid development of the world economy, energy and the environment have become important factors that plague economic growth. In recent years, with the emergence of a large number of electronic products and new energy vehicles, the demand for batteries has been increasing. Lithium-ion batteries have attracted widespread attention due to their green, pollution-free, long cycle life, high energy density, and no memory effect. [0003] The performance of cathode materials for lithium-ion batteries is one of the key issues restricting the development and application of lithium-ion batteries. Nickel-based cathode materials have attracted extensive attention from researchers because of their high dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525
CPCH01M4/48H01M4/505H01M4/525Y02E60/10
Inventor 李伟伟姚栋嘉方鹏杨红霞
Owner XINXIANG UNIV
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