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High-nickel ternary cathode material, preparation method and application thereof

A positive electrode material, high-nickel technology, applied in the field of high-nickel ternary positive electrode materials and its preparation, can solve the problems of uneven coating, high-temperature performance of materials and deterioration of high-temperature storage, etc., to achieve strong operability, suppress collapse, The effect of easy industrialization

Active Publication Date: 2021-03-16
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the process of this method is relatively simple, the coating is prone to uneven phenomena, resulting in poor high-temperature performance and high-temperature storage of the material.

Method used

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  • High-nickel ternary cathode material, preparation method and application thereof
  • High-nickel ternary cathode material, preparation method and application thereof

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preparation example Construction

[0046] According to the method for preparing a high-nickel ternary positive electrode material according to the embodiment of the present invention, by using a phosphate solution to mix with a high-nickel ternary precursor material, and reacting with a lye, the surface of the high-nickel ternary precursor material can be uniformly coated The phosphate layer is used to isolate the direct contact between the electrolyte and the positive electrode material, reducing the occurrence of side reactions, thereby inhibiting the formation of the NiO cubic phase and the collapse of the material structure on the surface of the high-nickel ternary positive electrode material, and improving the cycle performance and thermal stability of the battery. Moreover, the method has the advantages of simple process, strong operability and easy industrialization.

[0047] In yet another aspect of the present invention, the present invention proposes a high-nickel ternary positive electrode material. A...

Embodiment 1

[0051] (1) the concentration is 20wt% phosphate LiH 2 PO 4 Solution and high nickel ternary precursor material Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mix according to the mass ratio of 5:95, and stir at a high speed in a water bath at 30°C for 30 minutes to obtain a mixed slurry;

[0052] (2) The concentration is 15%, the molar ratio LiOH: LiH 2 PO 4 The lithium hydroxide capacity of 2:1 was slowly dropped into the mixed slurry while stirring at 30°C and 400r / min for 2.5h, and filtered and washed until the pH of the filtrate was 6-7, and then in 80 After vacuum drying at ℃ for 20 h, the coating layer containing Li 3 PO 4 High-nickel ternary precursor material;

[0053] (3) Mix the high-nickel ternary precursor material containing the coating layer with lithium for 30 minutes, wherein the molar ratio of Ni, Co, Mn and lithium in the high-nickel ternary precursor material containing the coating layer is 1 : 1.05, to obtain the mixed material;

[0054] (4) Carry out pre-sintering...

Embodiment 2

[0056] (1) the concentration is 20wt% phosphate Al(H 2 PO 4 ) 3 Solution and high nickel ternary precursor material Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mix according to the mass ratio of 5:95, and stir at a high speed in a water bath at 30°C for 30 minutes to obtain a mixed slurry;

[0057] (2) The concentration is 15%, the molar ratio LiOH:Al(H 2 PO 4 ) 3 Lithium hydroxide capacity of 6:1 was slowly dropped into the mixed slurry while stirring at 400r / min for 2.5h at 30°C, and suction filtered and washed until the pH of the filtrate was 6-7, and then in 80 After vacuum drying at ℃ for 20h, the coating layer containing AlPO was obtained. 4 and Li 3 PO 4 High-nickel ternary precursor material;

[0058] (3) Mix the high-nickel ternary precursor material containing the coating layer with lithium for 30 minutes, wherein the molar ratio of Ni, Co, Mn and lithium in the high-nickel ternary precursor material containing the coating layer is 1 : 1.05, to obtain the mixed material...

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Abstract

The invention discloses a high-nickel ternary positive electrode material, and a preparation method and an application thereof. The preparation method comprises the steps of mixing and stirring a phosphate solution and a high-nickel ternary precursor material to obtain mixed slurry; (2) mixing and stirring an alkali liquor and the mixed slurry, wherein the alkali liquor and phosphate in the mixedslurry generate a precipitation reaction and are precipitated on the surface of the high-nickel ternary precursor material; carrying out suction filtration, washing and drying treatment to obtain thehigh-nickel ternary precursor material containing a coating layer; (3) mixing the high-nickel ternary precursor material containing the coating layer with lithium to obtain a mixed material; and (4) sequentially carrying out pre-sintering and sintering treatment on the mixed material under the condition of pure oxygen to obtain the high-nickel ternary positive electrode material. According to themethod, a phosphate layer can uniformly coat the surface of the high-nickel ternary precursor material, so that direct contact between an electrolyte and the positive electrode material is isolated, the generation of a secondary reaction is reduced, the generation of an NiO cubic phase on the surface layer of the positive electrode material and the collapse of a material structure are inhibited, and the cycling performance and the thermal stability of a battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery positive electrode materials, in particular, the invention relates to a high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high working voltage, wide working temperature range, long cycle life, no memory effect, no pollution, light weight, good safety performance, etc., so they are widely used in mobile phones, digital cameras, notebook computers and other mobile devices. With the development of science and technology, most products tend to be portable and economical, which requires lithium-ion battery products to develop in the direction of high energy density. [0003] At present, cobalt has the disadvantages of resource shortage and high price, and the space for lithium cobalt oxide to further increase the energy density of batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 高天常吕豪杰
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD