Positive electrode material preparation method and prepared positive electrode material

A technology of positive electrode material and lithium source, applied in the field of positive electrode material preparation method and its prepared positive electrode material, can solve the problems of cycle performance deterioration, layered structure easy to collapse, etc., to improve cycle performance, improve cycle performance, and increase diffusion coefficient Effect

Active Publication Date: 2019-11-29
广东风华新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing positive electrode materials and the prepared positive electrode materials to overcome the problems of easy collapse of the layered structure and deterioration of cycle performance in lithium batteries prepared from existing positive electrode materials.

Method used

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  • Positive electrode material preparation method and prepared positive electrode material
  • Positive electrode material preparation method and prepared positive electrode material
  • Positive electrode material preparation method and prepared positive electrode material

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[0013] The present invention provides a method for preparing a positive electrode material and the prepared positive electrode material. The method for preparing the positive electrode material and the prepared positive electrode material will be described in detail below.

[0014] A method for preparing a positive electrode material, comprising the steps of:

[0015] A. The first lithium source and the doped cobalt source are mixed and sintered to obtain material A;

[0016] B. Mixing and sintering the second lithium source, nickel-manganese-cobalt ternary precursor and nickel oxide to obtain material B;

[0017] C. Mixing and sintering material A, material B and coating agent;

[0018] Wherein, the doping element of the cobalt source includes at least one of Mg, Al, Ti and Zr and Sb, and the coating agent includes at least one of aluminum oxide, lanthanum oxide and yttrium oxide, and nickel oxide.

[0019] It should be noted that there is no sequence between step A and ste...

Embodiment 1

[0031] A method for preparing a positive electrode material, comprising the steps of:

[0032] A. After Sb and Zr are doped with tricobalt tetroxide, they are mixed with lithium carbonate and sintered to obtain material A;

[0033] B. Lithium carbonate, nickel-manganese-cobalt ternary precursor and nickel oxide are mixed and sintered to obtain material B;

[0034] C. Mix and sinter material A, material B, yttrium oxide and nickel oxide.

Embodiment 2

[0036] A method for preparing a positive electrode material, comprising the steps of:

[0037] A. Doping Sb and Mg with tricobalt tetroxide and mixing them evenly with lithium carbonate, sintering at 1030°C for 2 hours, and ball milling after cooling to form material A with a particle size D50 of 25 μm;

[0038] B. Mix lithium carbonate, nickel-manganese-cobalt (523) ternary precursor and nano-nickel oxide evenly, sinter at 900°C for 10 hours, and ball mill after cooling to form material B with a particle size D50 of 8 μm;

[0039] C. Mix material A, material B, nickel oxide and aluminum oxide evenly, keep the temperature at 900°C for 8 hours, crush and sieve after cooling;

[0040] Wherein, in the A step, the doping amounts of Sb and Mg are respectively 0.1% and 0.15% of the molar number of Co, and the cobalt tetroxide raw material is carried out batching according to Li: Co mol ratio is 1.05; In the B step, lithium carbonate, nickel cobalt manganese ( 523) ternary precursor...

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Abstract

The invention provides a positive electrode material preparation method, which comprises the steps of A, performing mixing treatment and sintering treatment on a first lithium source and a doped cobalt source to obtain a material A; B, performing mixing treatment and sintering treatment on a second lithium source, a nickel-manganese-cobalt ternary precursor and nickel oxide to obtain a material B;C, performing mixing treatment and sintering treatment on the material A, the material B and a coating agent, wherein doping elements for doping the cobalt source comprise at least one of Mg, Al, Tiand Zr and Sb, and the coating agent comprises at least one of aluminum oxide, lanthanum oxide and yttrium oxide and nickel oxide. The positive electrode material prepared according to the positive electrode material preparation method has the advantages of high specific capacity, good cycle performance, small high-temperature storage thickness expansion rate, high energy density and the like, andcan meet the requirements of the market on the positive electrode material for the high-capacity high-performance lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of positive electrode material preparation, in particular to a method for preparing positive electrode material and the prepared positive electrode material. Background technique [0002] Lithium-ion batteries have been widely used in small portable appliances such as notebook computers, mobile phones, and camcorders, while various 3C electronic products are developing in the direction of thinner and lighter, 3C products are updated more and more frequently, and the development energy density is higher. Lithium-ion battery cathode materials with better cycle performance and lower cost have become the goal pursued by the lithium battery industry. [0003] The cathode material for lithium-ion batteries plays a decisive role in the overall performance and cost performance of lithium-ion batteries. At present, the positive electrode materials used in 3C battery products are still mainly high-voltage lithium cob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/505H01M4/62H01M10/0525Y02E60/10
Inventor 刘玉红廖钦林董明月周源罗继华叶浩杰
Owner 广东风华新能源股份有限公司
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