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

Pending 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

[0061] Embodiments of the present invention also provide a method for preparing the positive electrode active material, comprising the following steps:

[0062] a. Provide the lithium nickel manganese oxide modified material;

[0063] b. mixing an inorganic compound or an inorganic compound precursor with the lithium nickel manganese oxide modified material to obtain a coating mixture, and the inorganic compound precursor is sintered to form the inorganic compound; and

[0064] c. Sintering the coating mixture in a non-oxidizing atmosphere at 250° C. to 550° C. for 0.5 hours to 20 hours.

[0065] In some embodiments, the step of providing the lithium nickel manganese oxide modified material includes:

[0066] a1. Mixing a phosphorus source, a rock-salt-like phase inducer, and the lithium nickel manganese oxide spinel structure material to obtain a doping mixture; and

[0067] a2. Sintering the doped mixture at 600° C. to 1200° C. for 0.5 hours to 20 hours.

[0068] The lith...

Embodiment 1

[0097] 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. Take 10g of the modified material, 0.05g of boron oxide and 0.1g of alumina for uniform solid phase mixing, and then sinter in air at 450°C for 10h, and finally obtain boron oxide and alumina co-coated, surface gradient P-doped nickel manganese acid Lithium cathode active material.

[0098] figure 1 The STEM image of the phosphorous element gradient-doped lithium nickel manganese oxide modified material prepared in Example 1 is shown. From figure 1 It can be seen that the surface of the material has a rock-salt-like phase generated by the occupation of 16c atoms of spinel octahedron, and the thickness of the rock-salt-like phase ...

Embodiment 2

[0102] 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 oxygen 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-gradient-doped lithium nickel manganese oxide modified material. Take 10g of the modified material and 0.1g of polyvinylidene fluoride for uniform solid-state mixing, and then sinter in vacuum at 250°C for 15h, and finally obtain a fluoride-coated, surface gradient P-doped lithium nickel manganese oxide positive electrode active material.

[0103] Figure 4 Shown are the STEM images of the phosphorous element gradient-doped lithium nickel manganese oxide modified material prepared in Example 2, wherein (a) and (b) are images at different magnifications, respectively. from Figure 4 It can be seen that there is a rock-salt phase formed by the occupation of spinel octahedron 8a atoms on th...

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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 is composed of an inorganic compound; 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, for the high-voltage spinel cathode material, during the cycle, due to the interaction between the traditional carbonate electrolyte and the cathode material, the surface of the cathode material loses oxygen, and the surface of the material dissolves, eventually resulting in the active material reduce. Surface modification has become the focus of attention. The commonly used surface ...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/131H01M4/628H01M10/0525C01G53/54C01P2004/04C01P2006/40C01P2002/85H01M2004/021H01M2004/028H01M4/36H01M4/62C01G53/00Y02E60/10H01M4/1391H01M10/052H01M4/0471H01M4/485C01G53/50H01M4/0404
Inventor 武怿达黄学杰詹元杰马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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