Lithium ion battery cathode material and preparation method and application thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the impact of NCA materials on the electrochemical performance, achieve precise control of stoichiometric ratio, improve electrochemical performance, particle size Narrow distribution of effects

Inactive Publication Date: 2020-03-27
GUANGDONG INST OF RARE METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to clean the residual organic anions in the precursor, which will easily affect the electrochemical performance of NCA materials; the synthesis process using sodium metaaluminate as the aluminum source can also solve the problem of Al 3+ Co-precipitation problem, this method achieves co-precipitation with nickel and cobalt ions through the slow hydrolysis of sodium metaaluminate during the reaction process to generate aluminum hydroxide, however, it is still necessary to strictly control the concentration of reactants during the co-precipitation process, temperature, pH value, feeding rate and stirring rate determine the particle size, element distribution, crystal form and other physical parameters of the material and many other process parameters

Method used

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  • Lithium ion battery cathode material and preparation method and application thereof
  • Lithium ion battery cathode material and preparation method and application thereof
  • Lithium ion battery cathode material and preparation method and application thereof

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preparation example Construction

[0084] A method for preparing a positive electrode material for a lithium-ion battery provided in an embodiment of the present invention includes:

[0085] The ternary precursor is obtained by hydrolyzing the metal alkoxide aluminum salt to coat the pseudo-boehmite layer on the surface of the nickel-cobalt binary precursor. The chemical formula of the binary precursor is Ni x co y (OH) 2 , where both x and y are greater than 0, and x+y=1;

[0086] After mixing the ternary precursor and lithium salt evenly, sintering in an oxygen atmosphere to obtain LiNi a co b Al c o 2 , where a, b and c are all greater than 0, and a+b+c=1.

[0087] The reaction system of the metal alkoxide aluminum salt hydrolysis method is uniform, which is conducive to the growth of the crystal grains into a spherical shape, and the pseudo-boehmite is formed after the particles are agglomerated. The hydroxyl group produced by the adsorption of water on the surface of the binary precursor can provide...

Embodiment 1

[0129] Weigh 4.26g of aluminum isopropoxide, dissolve it in 50ml of absolute ethanol, and stir with a magnetic stirrer at room temperature at 1300rpm for 1.5h to obtain an aluminum isopropoxide solution. Then prepare 60ml of mixed reaction solvent, the volume ratio of water and absolute ethanol in the mixed reaction solvent is 1:1. The mixed reaction solvent was added to the first aluminum isopropoxide solution, and magnetic stirring was continued for 0.5 h to obtain an aluminum mixed solution. Weigh 36.6g Ni 0.928 co 0.072 (OH) 2 Add the powder into the aluminum mixed solution to obtain a mixed slurry, heat the slurry to 60°C, stir at 1000rpm for 4h to obtain a jelly, and then place the jelly in a drying oven for 24h at 80°C. Take 19.15g dry powder and 9.18g LiOH·H 2 O is evenly mixed, where Li:(Ni+Co+Al)=1.05:1 (molar ratio), sintered in stages in an atmosphere furnace filled with oxygen, first at 500°C for 5h, then at 700°C for 10h, and finally with The furnace was coo...

Embodiment 2

[0131] Weigh 4.26g of aluminum isopropoxide, dissolve it in 50ml of absolute ethanol, and stir with a magnetic stirrer at room temperature at 1300rpm for 1.0h to obtain an aluminum isopropoxide solution. Then prepare 60ml mixed reaction solvent, wherein the volume ratio of water and absolute ethanol is 1:1. Weigh 36.6g Ni 0.928 co 0.072 (OH) 2 The powder was added into the mixed reaction solvent, and the nickel-cobalt slurry was obtained after magnetic stirring for 0.5 h. Add the aluminum isopropoxide solution to the nickel-cobalt slurry to obtain a mixed slurry, stir while mixing, heat the mixed slurry to 60°C, stir at 1000rpm for 3.5h to obtain a jelly, and then place the jelly in Dry in a drying oven at 80°C for 24h. Take 19.15g dry powder and 9.18g LiOH·H 2 O is evenly mixed, where Li: (Ni+Co+Al) = 1.05:1 (molar ratio), sintered in stages in an atmosphere furnace filled with oxygen, first at 500°C for 5h, then at 700°C for 10h, and finally with the furnace Cool to ro...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery cathode material and a preparation method and application thereof. The preparation method ofthe lithium ion battery cathode material comprises the following steps: hydrolyzing metal alkoxide to coat the surface of a nickel-cobalt binary precursor with a pseudo-boehmite layer to obtain a ternary precursor, wherein the chemical formula of the binary precursor is NixCoy (OH) 2, x and y are both greater than 0, and x + y = 1; and uniformly mixing the ternary precursor with a lithium salt, and sintering in an oxygen atmosphere to obtain LiNiaCobAlcO2, in which a, b and c are all greater than 0, and a + b + c = 1. The lithium ion battery cathode material is prepared by adopting the preparation method provided by the invention. The cathode material prepared by the preparation method provided by the invention has the characteristics of stable electrochemical performance, uniform chemicalcomponents, narrow and uniform particle size distribution and the like. The cathode material can be applied to preparation of a lithium ion battery cathode or a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular, to a lithium-ion battery cathode material and a preparation method and application thereof. Background technique [0002] In the past three decades, lithium-ion batteries have been widely used in consumer electronics, communications, electric vehicles, and large-scale energy storage power stations. With the rapid development of electric vehicles, the shortcomings of its cruising range are becoming more and more prominent, and the call for continuously improving the energy density of lithium-ion batteries is getting louder and louder. By 2020, my country's expectation for the energy density of lithium-ion power battery cells will reach 350Wh / Kg. Based on the energy density of lithium-ion batteries is determined by the theoretical energy density of the battery and the specific gravity of inactive materials, in addition to reducing the use of inactive materials, the imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/46H01M4/485H01M4/525H01M10/0525
CPCH01M4/366H01M4/463H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 王英肖方明黄玲罗京唐仁衡李文超
Owner GUANGDONG INST OF RARE METALS
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