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Modified nickel cobalt manganese ternary composite electrode material coated on oxide surface and preparation method thereof

A composite electrode and surface coating technology, applied in active material electrodes, positive electrodes, battery electrodes, etc., can solve the problems of reducing surface impedance, fast capacity decay, poor stability of nickel-cobalt-manganese ternary electrode materials, etc. Impedance, low cost, effect of enhancing cycle stability

Active Publication Date: 2017-11-07
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a nickel-cobalt-manganese ternary electrode material with an oxide coating layer, the coating layer can prevent the dissolution of metal ions in the active material, resist the corrosion of the active material by HF, reduce the surface resistance and improve the corrosion resistance of the material. Cycle stability, solving the problem of poor stability of nickel-cobalt-manganese ternary electrode materials and rapid capacity decay

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 3.3g of lithium acetate, 5.31g of nickel acetate, 1.77g of cobalt acetate, and 1.73g of manganese acetate in a ball mill jar, add 100ml of absolute ethanol, and then add 0.0486g of niobium oxide and 0.0486g of zirconium oxide into the above solution. The above solution was fully dispersed and ball milled for 4 hours to obtain a uniformly dispersed solution, and the above solution was dried in an oven at 100° C. to obtain a dry oxide-coated nickel-cobalt-manganese composite electrode material precursor. Put this precursor in a box furnace, calcinate at 900°C for 24 hours, and the heating rate is 3°C / min, and prepare niobium oxide and zirconium oxide coatings, with an oxide coating with a mass percentage of about 2%. Nickel-cobalt-manganese composite electrode material. The composite electrode material was assembled into a button battery for charge and discharge tests, and compared with the uncoated nickel-cobalt-manganese electrode material. According to the test,...

Embodiment 2

[0032] Weigh 3.3g of lithium acetate, 5.3g of nickel acetate, 1.77g of cobalt acetate, and 1.73g of manganese acetate in a ball mill jar, add 100ml of absolute ethanol, and then add 0.097g of niobium oxide and 0.097g of zirconium oxide into the above solution. The above solution was fully dispersed and ball milled for 4 hours to obtain a uniformly dispersed solution, and the above solution was dried in an oven at 100° C. to obtain a dry oxide-coated nickel-cobalt-manganese composite electrode material precursor. The precursor was placed in a box furnace and calcined at 900°C for 24 hours with a heating rate of 3°C / min to prepare an oxide coating with a mass percentage of niobium oxide and zirconium oxide coatings of about 4%. Nickel-cobalt-manganese composite electrode material. The composite electrode material was assembled into a button battery for charge and discharge tests, and compared with the uncoated nickel-cobalt-manganese electrode material. After testing, the nicke...

Embodiment 3

[0034] Weigh 3.3g of lithium acetate, 5.31g of nickel acetate, 1.77g of cobalt acetate, and 1.73g of manganese acetate in a ball mill jar, add 100ml of absolute ethanol, and then add 0.146g of niobium oxide and 0.146g of zirconium oxide into the above solution. The above solution was fully dispersed and ball milled for 4 hours to obtain a uniformly dispersed solution, and the above solution was dried in an oven at 100° C. to obtain a dry oxide-coated nickel-cobalt-manganese composite electrode material precursor. The precursor was placed in a box furnace, calcined at 900°C for 24 hours, and the heating rate was 3°C / min, and an oxide coating with a mass percentage of niobium oxide and zirconium oxide coating layers of about 6% was prepared. Nickel-cobalt-manganese composite electrode material. The composite electrode material was assembled into a button battery for charge and discharge tests, and compared with the uncoated nickel-cobalt-manganese electrode material. According ...

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Abstract

The invention provides a modified nickel cobalt manganese ternary composite electrode material coated on an oxide surface and a preparation method thereof. A coating layer of the composite electrode material is prepared from two or three metal oxides MxOy, wherein M is niobium, zirconium or yttrium; the thickness of the coating layer is 0.5-50nm and the weight percent in the composite electrode material is 1%-10%; the prepared nickel cobalt manganese composite electrode material has an alpha-NaFeO2 layered structure. Nickel acetate, cobalt acetate, manganese acetate and lithium acetate are taken as raw materials, the metal oxides are served as surface coating matters and the high-temperature sintering and in-situ coating combined technology is adopted for preparing the high-performance composite electrode material. The coating layer of the composite electrode material can prevent the metal ions in active materials from dissolving, can resist against the corrosion of HF to active materials and can reduce the surface impedance and promote the cycling stability. The preparation process is simple, the operation is easy, the production period is short, the equipment requirement is low and industrial development and popularization and application are benefited.

Description

technical field [0001] The invention relates to the technical field of battery materials, and specifically relates to an improved oxide surface-coated nickel-cobalt-manganese ternary composite electrode material and a preparation method thereof. Background technique [0002] Compared with traditional batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, less pollution, and no memory effect, and have been widely used in electronic products, mobile tools and other fields. As people pay more and more attention to environmental pollution, green and environmentally friendly electric vehicles powered by lithium ions or auxiliary power have begun to be advocated and paid attention to by people. The development of lithium-ion batteries and related components such as lithium-ion battery cathode materials is imminent. [0003] Ternary lithium-ion battery cathode material is a new type of lithium-ion battery cathode material developed in re...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 何蕊刘振法任斌张利辉白薛
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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