A kind of high-nickel material whose surface is coated with lithium aluminum silicate and whose surface is doped with fluorine, and its preparation method

A lithium aluminum silicate and surface coating technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of not taking into account the lithium ion and electronic conductivity characteristics of the coating layer, and restricting the electrochemical performance of high-nickel ternary materials. , the decrease of electronic conductivity of materials, etc., to achieve the effect of low cost, simple preparation process and industrialization

Active Publication Date: 2021-09-17
余姚市海泰贸易有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Although the coating layer has good lithium ion conductivity, lithium metaaluminate is an insulator material, so the electronic conductivity of the coated material decreases, which affects the performance of the material rate performance.
Since the materials currently used to coat high-nickel positive electrodes do not take into account the conductive properties of lithium ions and electrons in the cladding layer, which restricts the further improvement of the electrochemical performance of high-nickel ternary materials, it is necessary to design a High nickel material in the surface layer with higher lithium ion and electronic conductivity to further enhance its electrochemical performance

Method used

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  • A kind of high-nickel material whose surface is coated with lithium aluminum silicate and whose surface is doped with fluorine, and its preparation method
  • A kind of high-nickel material whose surface is coated with lithium aluminum silicate and whose surface is doped with fluorine, and its preparation method
  • A kind of high-nickel material whose surface is coated with lithium aluminum silicate and whose surface is doped with fluorine, and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0048] The preparation method of the high nickel material coated with lithium aluminum silicate on the surface and doped with fluorine on the surface of the present embodiment is carried out according to the following steps:

[0049] (1) take by weighing an appropriate amount of aluminum n-butoxide and ethyl silicate and dissolve in ethanol according to an equimolar ratio, add ethanolamine with an equimolar amount of aluminum n-butoxide as a dispersant, obtain a clear and transparent solution after fully stirring, in Dilute the volume to 0.1 mol / L with deionized water in the volumetric flask; weigh a certain mass of 811-type nickel-cobalt-manganese ternary cathode material precursor according to the mass ratio of 1% lithium aluminum silicate coating, and stir at room temperature well mixed to obtain a mixture;

[0050] (2) drying the mixture obtained in step (1) under vacuum conditions, after pre-firing the dried material at 600° C. for 6 hours in an air atmosphere, sieve to o...

Embodiment 2

[0059] The preparation method of the high nickel material coated with lithium aluminum silicate on the surface and doped with fluorine on the surface of the present embodiment is carried out according to the following steps:

[0060] (1) Weigh a certain mass of 811-type nickel-cobalt-manganese ternary positive electrode material precursor, add equimolar ratio of aluminum oxide and silicon dioxide according to the 1% mass ratio of lithium aluminum silicate coating, and at room temperature Stir and mix thoroughly to obtain a mixture;

[0061] (2) after the obtained mixture is pre-fired at 600 DEG C for 6h under air atmosphere, sieve to obtain undersize;

[0062] (3) The obtained undersize is mixed with lithium hydroxide in a molar ratio of 1:1.1, and sintered at 750° C. for 30 hours in a pure oxygen atmosphere to obtain a high-nickel ternary material coated with lithium aluminum silicate;

[0063] (4) The high nickel ternary material coated with lithium aluminum silicate is uni...

Embodiment 3

[0066] The preparation method of the high nickel material coated with lithium aluminum silicate on the surface and doped with fluorine on the surface of the present embodiment is carried out according to the following steps:

[0067] (1) take by weighing an appropriate amount of aluminum sec-butoxide and ethyl silicate and dissolve in ethanol according to an equimolar ratio, add ethanolamine with an equimolar amount of aluminum sec-butoxide as a dispersant, obtain a clear and transparent solution after fully stirring, in Dilute the volume to 0.1 mol / L with deionized water in the volumetric flask; weigh a certain mass of nickel-cobalt-aluminum (LiNi 0.8 Co 0.15 Al 0.05 O 2 ) material precursor, stir and mix well at room temperature to obtain a mixture;

[0068] (2) drying the mixture obtained in step (1) under vacuum conditions, after pre-firing the dried material at 600° C. for 6 hours in an air atmosphere, sieve to obtain undersize;

[0069] (3) The obtained undersize is ...

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Abstract

The invention discloses a high-nickel material whose surface is coated with lithium aluminum silicate and whose surface layer is doped with fluorine. It comprises a lithium aluminum silicate coating layer and a central layer of a high-nickel ternary material. mixed with fluorine. At the same time, a preparation method of a high-nickel material is disclosed, including mixing, drying and sieving, adding lithium to sinter, and adding fluorine to heat treatment. The cladding layer of the lithium aluminum silicate fast ion conductor material of the present invention has good lithium ion conductivity, and the oxygen in the cladding layer or high-nickel material is replaced by fluoride ion doping, thereby improving the electronic conductivity of the material, and finally making the high The surface of the nickel material has good lithium ion and electron conductivity at the same time, which is beneficial to the performance of the rate performance of the positive electrode material of the lithium ion battery. The preparation method of the present invention is low in cost, simple in process, and easy to realize industrialization.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a high nickel material coated with lithium aluminum silicate on the surface and doped with fluorine on the surface and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the automobile industry, the accompanying environmental pollution and the rapid consumption of petrochemical resources have gradually attracted people's attention, and all countries are actively developing clean energy. Among them, lithium-ion batteries are attracting more and more attention as the energy storage device with the highest energy density that can be achieved at present. Electric vehicles (EVs) and hybrid electric vehicles (HEVs) using lithium-ion batteries as vehicle power will also become an inevitable direction for the development of the automotive industry in the future. . Lithium-ion power battery, as the main candidate power source for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62
CPCH01M4/364H01M4/38H01M4/62Y02E60/10
Inventor 申斌陈小平齐士博曾思莎
Owner 余姚市海泰贸易有限公司
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