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Lithium nickel manganese oxide positive electrode material and preparation method thereof

A cathode material, lithium nickel manganate technology, applied in the field of lithium nickel manganate cathode material and its preparation, can solve problems such as uneven composition of raw materials, achieve controllable morphology and particle size, improve performance, and simple process flow. Effect

Active Publication Date: 2019-05-03
YINLONG ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, one of the purposes of the present invention is to provide a lithium nickel manganese oxide positive electrode material and its preparation method, positive electrode sheet, battery, to solve the traditional method nickel The problem of uneven composition of raw materials in lithium manganate cathode material

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  • Lithium nickel manganese oxide positive electrode material and preparation method thereof
  • Lithium nickel manganese oxide positive electrode material and preparation method thereof
  • Lithium nickel manganese oxide positive electrode material and preparation method thereof

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preparation example Construction

[0053] The invention provides a preparation method of lithium nickel manganese oxide positive electrode material, such as figure 1 shown, including:

[0054] S10: Prepare the precursor by co-precipitation method, specifically Ni x mn y (OH) 2 Precursor;

[0055] S20: Mix the above precursor with the lithium source, and obtain lithium nickel manganese oxide positive electrode material through solid phase sintering, the lithium nickel manganese oxide positive electrode material is LiNi x mn y o 4 , wherein, x+y=2, x>0, y>0.

[0056] The preparation method of above-mentioned Lithium Nickel Manganese Oxide cathode material, first by chelating agent complexation Ni 2+ , Mn 2+ to reduce its nucleation rate, and simultaneously with Ni 2+ , Mn 2+ Uniform co-precipitation and crystallization to prepare Ni with uniform composition and particle size distribution x mn y(OH) 2 Precursor, and then solid-state sintering of lithium source and precursor to prepare high-voltage lit...

Embodiment 1

[0082] A preparation method of lithium nickel manganese oxide positive electrode material, comprising:

[0083] S110: Preparation of precursor: the total concentration of preparation is 5mol / L and Ni 2+ :Mn 2+ The molar ratio of the metal sulfate solution is 1:3, and the molar concentration is 10mol / L Na 2 CO 3 The solution, a 2-methyl-8-hydroxyquinoline solution with a molar concentration of 5 mol / L, is pumped into the reactor simultaneously in a co-current manner, the pH of the reaction system is controlled to be 9.0, and the temperature of the reaction system is 50°C. The precursor after the reaction was completed was washed in deionized water at 30° C. to neutrality, and dried at 50° C. for 50 hours to obtain a lithium nickel manganese oxide cathode material precursor.

[0084] S120: Preparation of high-voltage lithium nickel manganese oxide: Weigh the precursor and lithium source at a molar ratio of lithium hydroxide monohydrate: precursor of 2:1, mix well, and raise t...

Embodiment 2

[0087] A preparation method of lithium nickel manganese oxide positive electrode material, comprising:

[0088] S210: Preparation of precursor: the total concentration of preparation is 2mol / L and Ni 2+ :Mn 2+ The molar ratio of the metal sulfate solution is 1:3, and the molar concentration is 4mol / L Na 2 CO 3 The solution, a lactic acid solution with a molar concentration of 2 mol / L, is pumped into the reactor simultaneously in a co-current manner, the pH of the reaction system is controlled to be 10.0, and the temperature of the reaction system is 70°C. The precursor after the reaction was completed was washed in deionized water at 80° C. until neutral, and dried at 80° C. for 20 hours to obtain a lithium nickel manganese oxide cathode material precursor.

[0089] S220: Preparation of high-voltage lithium nickel manganese oxide: Weigh the precursor and lithium source according to the molar ratio of lithium carbonate: precursor of 1:1 and mix them evenly, raise the tempera...

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Abstract

The invention discloses a preparation method of a lithium nickel manganese oxide positive electrode material, and relates to the technical field of battery materials. The preparation method comprisesthe following steps: preparing a precursor by adopting a coprecipitation method, mixing the precursor with a lithium source, and carrying out solid-phase sintering to obtain the lithium nickel manganese oxide positive electrode material. The nickel lithium manganate positive electrode material provided by the invention has a high material uniformity degree, controllable morphology and particle size and good electrochemical performance, and performance of a battery made of the lithium nickel manganese oxide positive electrode material can be improved. Meanwhile, a chelating agent in the preparation method is environmentally friendly and is free of pollution, the process flow is simple, operation is easy, cost is low, the synthesis period is short, the product composition is uniform, and uniformity of product batches is good, so that the preparation method is very suitable for industrial production and is an efficient and energy-saving method for preparing the high-voltage lithium nickelmanganese oxide positive electrode material.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a lithium nickel manganese oxide cathode material and a preparation method thereof. Background technique [0002] The high-voltage lithium nickel manganese oxide material has a spinel structure. Compared with the layered structure of lithium cobalt oxide and ternary materials, the spinel structure is more stable and has a three-dimensional lithium ion diffusion channel, which is more conducive to the diffusion of lithium ions. The working voltage platform of lithium nickel manganese oxide material is as high as 4.7V. The high energy brought by its high working voltage and the stability of the structure during charging and discharging can meet the high energy density and safety requirements of electronic products and electric vehicles for lithium batteries. Requirements, and the lithium nickel manganese oxide material does not contain scarce elements such as cobalt, has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 董宏波詹世英朱守超郭华彬
Owner YINLONG ENERGY CO LTD
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