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Carbon-coated nickel-cobalt lithium manganate positive electrode material and preparation method thereof

A technology of nickel cobalt lithium manganate and lithium cobalt manganate is applied in the field of lithium battery cathode material preparation, and can solve the problems of poor electrical conductivity and difficult control of nickel cobalt lithium manganate cathode material.

Inactive Publication Date: 2014-09-17
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The operation process of the prior art is not easy to control, and the prepared nickel cobalt lithium manganese oxide positive electrode material has poor conductivity

Method used

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  • Carbon-coated nickel-cobalt lithium manganate positive electrode material and preparation method thereof
  • Carbon-coated nickel-cobalt lithium manganate positive electrode material and preparation method thereof
  • Carbon-coated nickel-cobalt lithium manganate positive electrode material and preparation method thereof

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preparation example Construction

[0064] In the third aspect, the embodiment of the present invention provides an embodiment of a method for preparing a carbon-coated nickel-cobalt lithium manganese oxide positive electrode material. figure 1 It is a flow chart of the method of this embodiment. as attached figure 1 As shown, the method includes:

[0065] Step 101, dissolving a predetermined amount of lithium salt and / or lithium hydroxide, nickel salt, cobalt salt and manganese salt in a solvent to obtain a first solution, adding a chelating agent and a carbon source to the first solution, and mixing uniformly , to obtain the second solution.

[0066] Step 102, performing high-temperature spray pyrolysis on the second solution to obtain a precursor powder, and vibrating or compacting the precursor powder so that the vibration or compaction density of the precursor powder is 0.3 g / cm 3 -3.2g / cm 3 .

[0067] Step 103, calcining the vibrated or compacted precursor powder, and cooling to room temperature to ob...

Embodiment 1

[0084] The embodiment of the present invention provides a method for preparing a carbon-coated nickel-cobalt-lithium manganese oxide composite positive electrode material, comprising the following steps:

[0085] 1) Accurately weigh a certain amount of Lithium Nitrate, Nickel Acetate, Cobalt Acetate, Manganese Acetate according to the amount ratio Li:Ni:Co:Mn=3.12:1:1:1, the solvent is deionized water, ethanol mixed solution ( The mass ratio of deionized water to ethanol is 1:1) to form a uniform solution. Add citric acid chelating agent and glucose carbon source, perform magnetic stirring to disperse evenly, and obtain a transparent mixed solution. Then, the solution is subjected to high-temperature spray pyrolysis with a pyrolysis temperature of 350° C. to obtain a precursor powder material.

[0086] 2) Vibrate the precursor powder material so that the tap density is 0.8g / cm 3 , and then sintered in an air atmosphere with programmed temperature control, heated to 800°C at ...

Embodiment 2

[0090] The embodiment of the present invention provides a method for preparing a carbon-coated nickel-cobalt-lithium manganese oxide composite positive electrode material, comprising the following steps:

[0091] 1) Accurately weigh a certain amount of lithium acetate, nickel nitrate, cobalt chloride, and manganese chloride according to the ratio of the substances Li:Ni:Co:Mn=1.06:0.3:0.3:0.4, and the solvent is ethanol to make a solution. Add triethanolamine chelating agent and phenolic resin carbon source, carry out ball milling to disperse evenly, and obtain a transparent mixed solution. Then, the solution is subjected to high-temperature spray pyrolysis with a pyrolysis temperature of 600° C. to obtain a precursor powder material.

[0092] 2) Compact the above-mentioned precursor powder material so that the compacted density is 2.5g / cm 3 , and then sintered in a temperature-programmed air atmosphere, heated to 950°C at a heating rate of 5°C / min, calcined for 6h, and then ...

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Abstract

The embodiment of the invention discloses a preparation method of a carbon-coated nickel-cobalt lithium manganate positive electrode material, and belongs to the technical field of preparation of a lithium battery positive electrode material. The preparation method comprises the following steps: adding a chelating agent and a carbon source into a solution containing lithium salt, nickel salt, cobalt salt and manganese salt, and performing high-temperature spray pyrolysis to obtain precursor powder; compacting the precursor powder by vibration or pressure, wherein the compaction density by the vibration or the pressure is 0.3-3.2g / cm<3> so that lithium ions, nickel ions, cobalt ions and manganese ions are uniformly dispersed in the powder and are contacted closely; and calcining the precursor powder, and cooling to obtain the carbon-coated nickel-cobalt lithium manganate positive electrode material with the good conductivity and the high cyclic stability. The carbon-coated nickel-cobalt lithium manganate positive electrode material comprises nickel-cobalt lithium manganate and carbon coating the surface of nickel-cobalt lithium manganate. The method disclosed by the embodiment of the invention is easy to operate and easy to control and facilitates the large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode material preparation, in particular to a carbon-coated nickel-cobalt lithium manganese oxide cathode material and a preparation method thereof. Background technique [0002] Due to the pressure of environmental pollution and energy shortage, countries are forced to find new energy sources and develop new means of transportation. At the same time, with the development of information technology, the urgent need of aerospace technology and modern weapons has led to the miniaturization of electronic instruments and equipment, and new electronic instruments and equipment are constantly coming out. Higher requirements are put forward for the battery industry, and the demand for small high-energy and high-reliability batteries is rapidly increasing. In order to meet this demand, a large number of new series and new structures of chemical and physical power sources and systems have been b...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 刘三兵朱广燕梅周盛卢磊
Owner CHERY AUTOMOBILE CO LTD
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