High-nickel material coated with aluminum and lithium silicate on surface and doped with fluorine on surface layer and preparation method

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

Active Publication Date: 2018-11-13
余姚市海泰贸易有限公司
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  • Abstract
  • Description
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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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  • High-nickel material coated with aluminum and lithium silicate on surface and doped with fluorine on surface layer and preparation method
  • High-nickel material coated with aluminum and lithium silicate on surface and doped with fluorine on surface layer and preparation method
  • High-nickel material coated with aluminum and lithium silicate on surface and doped with fluorine on surface layer and preparation method

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Effect test

Embodiment 1

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

[0049] (1) Take by weighing an appropriate amount of aluminum n-butoxide and ethyl silicate to be dissolved 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, and Use deionized water to set the volume to 0.1mol / L in the volumetric flask; calculate and weigh a certain mass of 811-type nickel-cobalt-manganese ternary cathode material precursor according to the mass ratio of 1% of the coating amount of lithium aluminum silicate, and stir at room temperature mix thoroughly;

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

Embodiment 2

[0059] The preparation method of the surface-coated lithium aluminum silicate and the high-nickel material doped with fluorine in the surface layer of this 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 aluminum oxide and silicon dioxide in equimolar ratios according to the 1% mass ratio of aluminum silicate coating amount, and Stir to mix the mixture thoroughly;

[0061] (2) After pre-calcining the obtained mixture at 600° C. for 6 hours in an air atmosphere, sieve to obtain the undersize;

[0062] (3) The obtained undersize is mixed with lithium hydroxide at 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 and 0.1% by mass ratio of ammonium flu...

Embodiment 3

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

[0067] (1) Take an appropriate amount of aluminum sec-butoxide and ethyl silicate according to an equimolar ratio and dissolve them in ethanol, add ethanolamine with an equimolar amount of aluminum sec-butoxide as a dispersant, and obtain a clear and transparent solution after fully stirring. Set the volume to 0.1mol / L with deionized water in the volumetric flask; take a certain mass of nickel-cobalt-aluminum (LiNi 0.8 co 0.15 Al 0.05 o 2 ) material precursor, stirred at room temperature and mixed thoroughly to obtain a mixture;

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

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

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Abstract

The invention discloses a high-nickel material coated with aluminum and lithium silicate on the surface and doped with fluorine on a surface layer. The high-nickel material comprises an aluminum and lithium silicate coating layer and a high-nickel ternary material central layer, wherein the thickness of the coating layer is 1-200 nm, and the coating layer is doped with a fluorine element. In addition, the invention discloses a preparation method of the high-nickel material. The preparation method comprises the steps of mixing, drying and screening, lithium-adding sintering and fluorine-addingthermal treatment. The aluminum and lithium silicate fast-ion conductor material coating layer has good lithium-ion conducting performance, doped fluorine ions replace oxygen in the coating layer or the high-nickel material, accordingly the electronic conductivity of the material is improved, finally the surface of the high-nickel material has better lithium-ion and electronic conductivity properties, and playing of the rate capability of an anode material for lithium ion batteries is facilitated. The preparation method of the high-nickel material is low in cost, the process is simple, and industrialization is easy to achieve.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a high-nickel material whose surface is coated with lithium aluminum silicate and whose surface is doped with fluorine, and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the automobile industry, the ensuing environmental pollution and the sharp consumption of petrochemical resources have gradually attracted people's attention, and all countries are actively developing clean energy. Among them, lithium-ion batteries, as the energy storage device with the highest energy density that can be realized at present, are attracting increasing attention. Electric vehicles (EV) and hybrid electric vehicles (HEV) that use lithium-ion batteries as vehicle power will also become the inevitable direction of future development of the automotive industry. . As the most important candidate power source for electric vehicles in the fut...

Claims

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Application Information

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Patent Type & Authority Applications(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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