Positive electrode active material and preparation method thereof, positive electrode and lithium ion secondary battery

A technology of positive active material and modified material, applied in secondary batteries, active material electrodes, positive electrodes, etc., can solve problems such as easy wear and tear

Active Publication Date: 2022-05-17
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a positive electrode active material and a preparation method for the problem that the surface coating of the positive electrode material is easy to be lost, the positive electrode, and the lithium ion secondary battery

Method used

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  • Positive electrode active material and preparation method thereof, positive electrode and lithium ion secondary battery
  • Positive electrode active material and preparation method thereof, positive electrode and lithium ion secondary battery
  • Positive electrode active material and preparation method thereof, positive electrode and lithium ion secondary battery

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preparation example Construction

[0065] Embodiments of the present invention also provide a method for preparing the positive electrode active material, comprising the following steps:

[0066] a. Provide the lithium nickel manganese oxide modified material;

[0067] b. Mixing the lithium nickel manganese oxide modified material with the organic compound to obtain a coating mixture;

[0068] or mixing the lithium nickel manganese oxide modified material with the precursor of the organic compound, and heating to obtain a coating mixture; and

[0069] c. The coating mixture is heated and reacted at 120° C. to 400° C. for 2 hours to 20 hours.

[0070] In some embodiments, the step of providing the lithium nickel manganese oxide modified material includes:

[0071] a1. Mixing a phosphorus source, a rock-salt-like phase inducer and a lithium nickel manganese oxide spinel structure material to obtain a doping mixture; and

[0072] a2. Sintering the doped mixture at 600° C. to 1200° C. for 0.5 hours to 20 hours. ...

Embodiment 1

[0109] 18g of LiNi 0.5 mn 1.5 o 4 Material (Shandong Qixing Energy Materials Co., Ltd.), 0.54g CuO and 0.267g (NH 4 ) 2 HPO 4 Mix evenly, and calcinate the obtained mixture in oxygen at 600°C for 5 hours, with a heating rate of 3°C / min and a cooling rate of 5°C / min, to obtain a phosphorus-doped lithium nickel manganese oxide modified material.

[0110] Weigh pyrophthalic anhydride and 4,4'-diaminodiphenyl ether at a molar ratio of 1:1, use dimethylacetamide as a solvent to synthesize a 10% polyamic acid solution, and then prepare 1% Polyamic acid solution, take 8mL polyamic acid solution, stir for 1h in an argon atmosphere, add 10g of lithium nickel manganese oxide modified material obtained in the above steps, heat and stir, keep at 60°C for 30 minutes, and keep at 120°C 30 minutes, 60 minutes at 200°C, 60 minutes at 300°C, and 10 minutes at 400°C for imidization to yield surface-gradient P-doped, post-coated polyimide nickel manganese Lithium Oxide positive electrode a...

Embodiment 2

[0115] 18g of LiNi 0.4 mn 1.6 o 4 Material (Shandong Qixing Energy Materials Co., Ltd.), 0.54gH 3 PO 4 Uniformly mixed with 1g of oxalic acid and calcined the resulting mixture in the air at 600°C for 5h, with a heating rate of 3°C / min and a cooling rate of 5°C / min, to obtain a phosphorus-doped lithium nickel manganese oxide modified material.

[0116] Using N-methylpyrrolidone as a solvent, prepare a polyamic acid solution with a mass concentration of 4%, and then prepare a 1% polyamic acid solution, take 8mL of the polyamic acid solution, stir for 1h in an argon atmosphere, and then add 10g of the above steps to obtain The lithium nickel manganese oxide modified material was heated and stirred, kept at 55°C for 30 minutes, at 125°C for 30 minutes, at 205°C for 60 minutes, at 305°C for 60 minutes and at 390°C 10 minutes, to realize imidization, and obtain a lithium nickel manganese oxide cathode active material with surface gradient P doping and post-coating with polyimid...

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Abstract

The invention discloses a positive electrode active material which comprises a lithium nickel manganese oxide modified material and a coating layer on the surface of the lithium nickel manganese oxide modified material, and the coating layer comprises an organic compound with-N or-COO bonds; the lithium nickel manganese oxide modified material comprises primary particles of a spinel phase and a rock-salt-like phase, the spinel phase is an inner core, and the rock-salt-like phase forms a shell; the spinel phase is of a nickel lithium manganate spinel structure; the rock-salt-like phase is formed by induction of a nickel lithium manganate spinel structure, the rock-salt-like phase contains at least one placeholder element of Mg, Zn, Ni, Mn, Fe, Co, Ti, Cr, Y, Sc, Ru, Cu, Mo, Ge, W, Zr, Ca, Ta, Sr, Al, Nb, B, Si, F and S, and the placeholder element is located at the 16c or 8a position of the spinel phase; the rock-salt-like phase is doped with phosphorus elements, and the phosphorus elements are distributed in a gradient mode from the outer surface of the rock-salt-like phase to the interior of the rock-salt-like phase. The invention also discloses a preparation method of the positive electrode active material, a positive electrode of a lithium ion secondary battery containing the positive electrode active material, and the lithium ion secondary battery.

Description

technical field [0001] The invention relates to the technical field of cathode materials, in particular to an anode active material and a preparation method, an anode, and a lithium ion secondary battery. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage, light weight, small size, no memory effect, low self-discharge rate, long cycle life, and high energy density. They have been widely used in Mobile terminal products such as mobile phones, laptops, and tablets. In practical applications, severe side reactions occur between the surface of the positive electrode material and the electrolyte under high voltage, resulting in rapid decomposition of the electrolyte, resulting in oxygen loss on the surface of the material, dissolution of the surface structure, and rapid decline in battery performance. Surface modification has become the focus of attention. . The commonly use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M4/131C01G53/00
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M4/131H01M10/0525C01G53/50C01P2004/04C01P2004/64H01M2004/021H01M2004/028
Inventor 武怿达黄学杰詹元杰马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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