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High-performance composite binary positive electrode material, preparation method thereof and lithium ion battery

A cathode material, lithium source technology, applied in lithium ion batteries, binary cathode materials, high-performance composite binary cathode materials and their preparation fields, can solve problems such as unfavorable large-scale production, cumbersome preparation process, long process, etc. Improve sample capacity and cycle performance, good cycle performance and low residual alkali

Pending Publication Date: 2020-05-26
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this solution achieves cobalt-free, its preparation process is cumbersome and the process is very long, which is unfavorable for large-scale production

Method used

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  • High-performance composite binary positive electrode material, preparation method thereof and lithium ion battery
  • High-performance composite binary positive electrode material, preparation method thereof and lithium ion battery
  • High-performance composite binary positive electrode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0064] In this embodiment, the following method is used to prepare a high-performance composite binary cathode material:

[0065] (1) Weigh 100g of Ni(OH) 2 The precursor is uniformly mixed with alumina at a mass ratio of 100:1, and sintered at 500°C for 5 hours to obtain nickel oxide doped with aluminum;

[0066] (2) Nickel oxide doped with aluminum and lithium hydroxide are mixed uniformly at a molar ratio of 1:1.03, and then sintered at 750°C for 7 hours to obtain a binary nickel aluminate material;

[0067] (3) Mix the binary nickel aluminate material with aluminum isopropoxide in a mass ratio of 100:5 (the mass of aluminum in the aluminum source is 6600 ppm of the binary nickel aluminate material mass), in a hydrogen sulfide atmosphere The composite binary cathode material is obtained by sintering three times for 5 hours at 500°C.

[0068] The composite binary cathode material prepared in this embodiment includes a binary lithium nickel aluminate material and a coating layer coat...

Embodiment 2

[0073] In this embodiment, the following method is used to prepare a high-performance composite binary cathode material:

[0074] (1) Weigh 100g of Ni(OH) 2 The precursor is uniformly mixed with aluminum hydroxide at a molar ratio of 98:1, and sintered at 600°C for 5 hours to obtain nickel oxide doped with aluminum;

[0075] (2) Nickel oxide doped with aluminum and lithium hydroxide are mixed uniformly at a molar ratio of 1:1.05, and then sintered at 730°C for 9 hours to obtain a binary nickel aluminate material;

[0076] (3) Mix the binary nickel aluminate material with aluminum isopropoxide in a mass ratio of 100:3 (the mass of aluminum in the aluminum source is 4000 ppm of the binary nickel aluminate material mass), in a hydrogen sulfide atmosphere The composite binary cathode material is obtained by sintering three times for 5 hours at 700°C.

[0077] The composite binary cathode material prepared in this embodiment includes a binary lithium nickel aluminate material and a coating...

Embodiment 3

[0080] In this embodiment, the following method is used to prepare a high-performance composite binary cathode material:

[0081] (1) Weigh 100g of Ni(OH) 2 The precursor is mixed uniformly with aluminum hydroxide at a molar ratio of 5:1, and sintered at 400°C for 8 hours to obtain nickel oxide doped with aluminum;

[0082] (2) Nickel oxide doped with aluminum and lithium hydroxide are mixed uniformly at a molar ratio of 1:1.1, and sintered at 600°C for 12 hours to obtain a binary nickel aluminate material;

[0083] (3) Add the binary nickel aluminate material and the aluminum source aluminum isopropoxide into the aluminum source according to the mass of aluminum element in the aluminum source as 1000 ppm of the weight of the binary nickel aluminate material, and put it in the hydrogen sulfide atmosphere at 300℃ three times After sintering for 10 hours, the composite binary cathode material is obtained.

[0084] The composite binary cathode material prepared in this embodiment include...

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Abstract

The invention provides a high-performance composite binary positive electrode material, a preparation method thereof and a lithium ion battery. The composite binary positive electrode material comprises a binary lithium nickel aluminate material and a coating layer coating the surface of the binary lithium nickel aluminate material, wherein the coating layer is mainly composed of an aluminum-containing compound and lithium sulfide. The preparation method comprises the steps of 1) mixing hydroxide of nickel with an aluminum source, and carrying out first sintering to obtain nickel oxide doped with an aluminum element; 2) mixing the nickel oxide doped with the aluminum element with a lithium source, and carrying out secondary sintering in an oxidizing atmosphere to obtain a binary lithium nickel aluminate material; and 3) mixing the binary lithium nickel aluminate material with an aluminum source, and carrying out third sintering in a hydrogen sulfide atmosphere to obtain the composite binary positive electrode material. The composite binary positive electrode material provided by the invention realizes cobalt-free treatment, the capacity of the composite binary positive electrode material can reach 215mAh / g or above, and the cycle performance is that the capacity retention rate of the composite binary positive electrode material can reach 95% or above when the composite binary positive electrode material is circulated for 50 cycles at 0.5C / 1C.

Description

Technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a binary anode material, in particular to a high-performance composite binary anode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] High nickel ternary cathode material (LiNi x M 1-x O 2 , 0.8≤x<1.0, M is one or more of Co, Mn and Al) has attracted much attention due to its higher energy density, but the high price of cobalt has restricted the development and development of high nickel ternary cathode materials. For application, researchers at this stage are increasing the content of nickel while reducing the content of cobalt, reducing the cost of materials, and taking the route of cobalt-free. [0003] CN104934596A discloses a method for preparing a nickel-aluminum binary cathode material, which includes the following steps: dissolving lithium, nickel, and aluminum soluble salts in a certain ratio in water / organic solv...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李旭罗亮吴小珍杨顺毅黄友元杨才德
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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