Spinel type single-crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material, spinel-type technology, applied in the direction of polycrystalline material growth, positive electrode, secondary battery, etc., to achieve the effect of good capacity and rate performance, favorable for Li+ transport, and good rate.

Active Publication Date: 2021-07-27
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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Problems solved by technology

In the existing synthesis technology of lithium nickel manganese oxide, the synthesis process is basically based on two sinterings (pre-oxidation and high-temperature sint

Method used

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  • Spinel type single-crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery
  • Spinel type single-crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery
  • Spinel type single-crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0036] The invention provides a method for preparing a spinel-type single crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material, comprising the following steps:

[0037] A) Under the action of precipitating agent, ammonia water and complexing agent, add nickel source and manganese source, carry out co-precipitation reaction, obtain Ni 0.5 mn 1.5 (OH) 4 binary precursor;

[0038] B) the Ni 0.5 mn 1.5 (OH) 4 The binary precursor is mixed with the lithium source, calcined at high temperature, then annealed at a low speed to keep it warm, and finally the temperature is naturally cooled to obtain single crystal LiNi 0.5 mn 1.5 o 4 Cathode material;

[0039] The temperature of the high-temperature calcination is 850-1000° C., the heating rate is 2-5° C. / min, and the time of high-temperature calcination is 6-15 hours.

[0040] In the present invention, under the action of precipitating agent, ammonia water and other complexing agents, a ...

Embodiment 1

[0061] NiSO 4 ·6H 2 O and MnSO 4 ·H 2O Prepare a mixed solution with a metal ion concentration of 1.5 mol / L according to the molar ratio of Ni / Mn as 1 / 3, the initial pH is 4, and add 0.04 mol / L of ethylenediamine and 0.3 mol / L of ammonia as a complexing agent , add 4mol / L NaOH as a precipitant, control the pH to 11, and the reaction temperature to 55°C, control its sphericity by means of continuous feeding, keep reacting for 8 hours, and finally age the reaction product for 12 hours, filter, and centrifugally wash After drying, Ni with a particle size of 4 μm was obtained 0.5 mn 1.5 (OH) 4 Binary cobalt-free precursor.

[0062] The above Ni 0.5 mn 1.5 (OH) 4 Precursors and Li 2 CO 3 Mix uniformly according to the molar ratio of 1:0.52, put it in a boat and place it in a muffle furnace for high-temperature calcination, during which air is properly blown in to control the atmosphere. From room temperature at a heating rate of 2°C / min, add heat to 980°C and keep the t...

Embodiment 2

[0070] Ni(Ac) 2 and Mn(Ac) 2 Prepare a mixed solution with a metal ion concentration of 1.5 mol / L according to the molar ratio of Ni / Mn as 1 / 3, the initial pH is 4.5, add 0.05 mol / L glycine and 0.3 mol / L ammonia water as a complexing agent, and add 2 mol / L of NaOH is used as a precipitating agent, the pH is controlled to be 11, and the reaction temperature is 55°C. Through continuous feeding, the sphericity is controlled, and the reaction is continued for 8 hours. Finally, the reaction product is aged for 12 hours, filtered, centrifuged, washed and dried. Ni with a particle size of 4 μm was obtained 0.5 mn 1.5 (OH) 4 Binary cobalt-free precursor.

[0071] The above Ni 0.5 mn 1.5 (OH) 4 Precursor and LiOH·H 2 O is uniformly mixed according to the molar ratio of 1:1.04, loaded into a boat and placed in a muffle furnace for high-temperature calcination, during which air is properly blown in to control the atmosphere. From room temperature at a heating rate of 2°C / min, a...

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Abstract

The invention provides a preparation method of a spinel type single-crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material. The method comprises the following steps of A) under the action of a precipitator, ammonia water and a complexing agent, adding a nickel source and a manganese source, and carrying out coprecipitation reaction to obtain a Ni0. 5Mn1. 5(OH)4 binary precursor; and B) mixing the Ni0. 5Mn1. 5(OH)4 binary precursor with a lithium source, carrying out high-temperature calcination, then carrying out low-speed annealing and heat preservation, and finally, naturally cooling to obtain the single-crystal LiNi0. 5Mn1. 5O4 positive electrode material. The main morphology of the material is a combination of a regular octahedron and a truncated octahedron, so that the material has the advantages of low price, simple preparation process, high compaction density, excellent electrochemical performance and the like. The invention also provides the spinel type single-crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material and a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a spinel-type single crystal cobalt-free high-voltage lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] In recent years, with the rapid development of the new energy industry, the development of lithium-ion battery materials with high capacity and high energy density has attracted everyone's attention. With the soaring sales of new energy vehicles in 2014, power cells have surpassed 3C cells and energy storage cells. So far, the automotive industry has become the largest market for lithium-ion batteries. [0003] At present, the commercialized lithium-ion battery materials mainly include layered lithium cobalt oxide (LiCoO 2 ), layered ternary materials (LiNi x co y mn z o 2 ), olivine-like lithium iron phosphate (LiFePO 4 ) and spinel lithium manganate ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00C30B1/10C30B29/22
CPCH01M4/505H01M4/525H01M10/0525C01G53/50C30B29/22C30B1/10H01M2004/028C01P2002/72C01P2004/03Y02E60/10
Inventor 陈宇桑椿媛刘瑞李琮熙孙辉
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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