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Preparation method of semiconductor oxide coated lithium nickel-cobalt aluminate ternary material

A technology of lithium nickel cobalt aluminate and ternary materials, which is applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor electrochemical cycle performance and unstable structure, and achieve the advantages of electron migration, particle size, etc. Stable diameter range and good sphericity

Inactive Publication Date: 2018-11-06
SHAANXI COAL & CHEM TECH INST
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  • Claims
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Problems solved by technology

[0004] In view of the structural instability and poor electrochemical cycle performance of the nickel-cobalt-lithium-aluminate ternary material, the purpose of the present invention is to provide a method for preparing a semiconductor oxide-coated nickel-cobalt-lithium-aluminate ternary material. Effectively improve the cycle stability of nickel-cobalt-lithium-aluminate ternary materials without reducing the initial charge-discharge capacity of the material

Method used

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  • Preparation method of semiconductor oxide coated lithium nickel-cobalt aluminate ternary material

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preparation example Construction

[0022] The preparation method of the nickel-cobalt-lithium-aluminate ternary material coated with the semiconductor oxide comprises the following steps:

[0023] Step 1, raw material preparation, mixing the lithium source and the nickel-cobalt-aluminum hydroxide precursor evenly, placing them in high-temperature equipment and calcining in an oxygen atmosphere to obtain nickel-cobalt-aluminum lithium oxide;

[0024] Step 2, material modification, disperse the semiconductor oxide in alcohol, add lithium nickel cobalt aluminate, mix evenly and then spray dry.

[0025] When the semiconductor oxide is a mixture of several types, the ratio is arbitrary.

[0026] In step 1, the lithium source is one or both of lithium hydroxide and lithium carbonate, the cobalt element content in the nickel cobalt aluminum hydroxide is 12-15% of its total molar amount, and the nickel element content is The total molar content is 80%-83%, the aluminum element content is 2%-5% of the total molar amoun...

Embodiment 1

[0032] Step 1. Mix lithium hydroxide and nickel-cobalt-aluminum hydroxide precursor evenly, wherein the molar ratio of the three metal elements of nickel-cobalt-aluminum in nickel-cobalt-aluminate lithium is 80:15:5, lithium and nickel-cobalt-aluminum hydroxide The molar ratio of the mixture is 1:1, and the mixture is calcined in a high-temperature equipment under an oxygen atmosphere. The first-stage calcining temperature is 480°C, the holding time is 10h, and the heating rate is 2°C / min. The second-stage calcining temperature is 700°C. The time is 8h, the heating rate is 2°C / min, and the nickel-cobalt-lithium-aluminate ternary material is obtained;

[0033] Step 2, material modification, dispersing nano-tin antimony oxide in alcohol, adding nickel-cobalt-lithium-aluminate ternary material, wherein the tin-antimony oxide is 0.5% of the nickel-cobalt-lithium-aluminate ternary material in terms of molar percentage, and the magnetic force is Stir for 3h, mix the two evenly and s...

Embodiment 2

[0037] Step 1. Mix lithium hydroxide and nickel-cobalt-aluminum hydroxide precursor evenly, wherein the molar ratio of the three metal elements in nickel-cobalt-aluminate lithium is 83:15:2, and the molar ratio of lithium and nickel-cobalt-aluminum hydroxide is The ratio is 1.08:1, and the mixture is calcined in a high-temperature equipment under an oxygen atmosphere. The first-stage calcining temperature is 550°C, the holding time is 2h, and the heating rate is 5°C / min. The second-stage calcining temperature is 780°C, and the holding time is 12h. The heating rate is 5°C / min, and the nickel-cobalt-lithium-aluminate ternary material is obtained;

[0038] Step 2, material modification, disperse nano-indium tin oxide in alcohol, add nickel-cobalt-lithium-aluminate ternary material, wherein in molar percentage, indium-tin oxide is 2% of nickel-cobalt-lithium-aluminate ternary material, magnetic force Stir for 0.5h, mix the two evenly and then spray dry.

[0039] Step 3: Mix the d...

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Abstract

The invention discloses a semiconductor oxide coated lithium nickel-cobalt aluminate ternary material and a preparation method thereof. The method comprises the following steps: a semiconductor oxideis used as a modifier for coating the surface of a lithium nickel-cobalt aluminate material; the semiconductor oxide is dispersed in an organic solvent, the lithium nickel-cobalt aluminate ternary material is added to the mixed solution, and spray drying is performed after uniform mixing; the semiconductor oxide is one or more of tin oxide, indium oxide, tin antimony oxide and indium tin oxide. The method is simple, and the prepared material has good thermal stability, reduced sensitivity to moisture and increased charge and discharge capacity and cycle stability.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and relates to a preparation method of a semiconductor oxide-coated nickel-cobalt-lithium-aluminate ternary material. Background technique [0002] Lithium nickel cobalt aluminate is an isotropic solid solution of lithium nickelate, lithium cobaltate, and lithium aluminate. It also has the high capacity, low cost, low toxicity, good cycle performance, high conductivity, and thermal stability of the three. However, due to the high content of nickel, it is more sensitive to moisture, and lithium hydroxide and lithium carbonate are easily formed on the surface, which makes the surface of the material too alkaline. On the one hand, it causes the loss of active lithium ions and reduces the hardness of the material. Charge and discharge capacity; on the other hand, the alkaline substances on the surface are easy to react with the electrolyte, which will cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 王夏阳寇亮张超张诚王继峰田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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