Preparation method of lithium ion conductor coated spinel lithium manganate positive electrode material

A technology of spinel lithium manganese oxide and positive electrode materials, which can be used in battery electrodes, electrical components, circuits, etc., and can solve the problems of poor high-rate performance and poor conductivity of materials

Inactive Publication Date: 2017-01-04
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a lithium ion conductor coated spinel lithium manganese oxide positive electrode material, aiming to solve the problem that the current method for improving the performance of the spinel lithium manganese oxide positive electrode material has an oxide coating material due to lithium ions. Poor conductivity, making the material's high-rate performance poor

Method used

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  • Preparation method of lithium ion conductor coated spinel lithium manganate positive electrode material
  • Preparation method of lithium ion conductor coated spinel lithium manganate positive electrode material
  • Preparation method of lithium ion conductor coated spinel lithium manganate positive electrode material

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Embodiment 1

[0043] (1) Manganese metal salt MnSO 4 Metal salt NiSO with nickel 4 Dissolve in 50mL water according to the molar ratio of 3:1, so that the total molar concentration of metal ions is 1 mol / L, to obtain a mixed solution of metal ions. Configure K with a molar concentration of 1 mol / L 2 C 2 o 4 Solution 50mL, under magnetic stirring, add the above precipitant solution into the above metal ion mixed solution to produce a precipitate, stir for 2 hours, centrifuge, wash the precipitate twice with deionized water and absolute ethanol, and place the precipitate Dry in an oven at 80°C for 12 hours to obtain a spinel lithium manganate precursor;

[0044] (2) Disperse the spinel lithium manganate precursor obtained in the above step (1) in absolute ethanol at a mass ratio of 1:10, add 1mL of ammonia water, stir and ultrasonically disperse for 10 minutes, according to Zr:Mn=0.5 : The molar ratio of 100, add the Zr(OC that mass percent concentration is 10%wt 4 h 9 ) 4 Anhydrous e...

Embodiment 2

[0047] (1) Manganese metal salt MnSO 4 Metal salt NiSO with nickel 4 Dissolve in 50mL water according to the molar ratio of 3:1, so that the total molar concentration of metal ions is 2 mol / L, to obtain a mixed solution of metal ions. Configure K with a molar concentration of 2 mol / L 2 C 2 o 4 Solution 50mL, under magnetic stirring, add the above precipitant solution into the above metal ion mixed solution to produce a precipitate, stir for 2 hours, centrifuge, wash the precipitate twice with deionized water and absolute ethanol, and place the precipitate Dry in an oven at 80°C for 12 hours to obtain a spinel lithium manganate precursor;

[0048] (2) Disperse the spinel lithium manganate precursor obtained in the above step (1) in absolute ethanol at a mass ratio of 1:20, add 1mL of ammonia water, stir and ultrasonically disperse for 10 minutes, according to Ti:Mn=0.6 : The molar ratio of 100, add the Ti(OC that mass percent concentration is 10%wt 4 h 9 ) 4 Anhydrous e...

Embodiment 3

[0051] (1) Manganese metal salt Mn(NO 3 ) 2 and nickel metal salt Ni(NO 3 ) 2 Dissolve in 50mL water according to the molar ratio of 3:1, so that the total molar concentration of metal ions is 1.5 mol / L, to obtain a mixed solution of metal ions. Configure Na with a molar concentration of 1.5 mol / L 2 C 2 o 4 Solution 50mL, under magnetic stirring, add the above precipitant solution into the above metal ion mixed solution to produce a precipitate, stir for 2 hours, centrifuge, wash the precipitate twice with deionized water and absolute ethanol, and place the precipitate Dry in an oven at 80°C for 12 hours to obtain a spinel lithium manganate precursor;

[0052] (2) Disperse the spinel lithium manganate precursor obtained in the above step (1) in absolute ethanol at a mass ratio of 1:15, add 1mL of ammonia water, stir and ultrasonically disperse for 10 minutes, according to Si:Mn=0.2 : The molar ratio of 100, add the Si(OC that mass percent concentration is 10%wt 2 h 5 ...

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Abstract

The invention discloses a preparation method of a lithium ion conductor coated spinel lithium manganate positive electrode material, which adopts two methods: coating through a hydrothermal method and coating through a direct stirring method. A lithium ion conductor (lithium zirconate, lithium titanate and lithium silicate) coating layer and a main-phase spinel lithium manganate positive electrode material are formed simultaneously in a lithiation reaction process so as to improve the bonding strength between the coating layer and the main-phase spinel lithium manganate positive electrode material, the thickness of the coating layer is uniform, the rate capability and cycling stability of the lithium ion battery are greatly improved, and particularly, the long-range cycling stability and the high rate capability are improved. According to the preparation method, the rate capability, cycling stability and high-temperature property of the spinel lithium manganate positive electrode material can be improved; the synthesis process is simple, the production efficiency is high, and the positive electrode material is suitable for large-scale production; raw materials needed by reactants are easily available and have no toxicity, and the cost is low; no special protection is needed in the production process; reaction conditions can be controlled easily; and the obtained product has the advantages of high yield, good result repeatability and the like.

Description

technical field [0001] The invention belongs to the technical field of spinel lithium manganate positive electrode materials, and in particular relates to a preparation method of a lithium ion conductor-coated spinel lithium manganate positive electrode material. Background technique [0002] Spinel lithium manganese oxide cathode material has attracted great attention in recent years due to its excellent energy density and outstanding high voltage window. Especially at the moment when there is an urgent need to develop electric vehicles, spinel lithium manganese oxide has gained an important place in the development field of power batteries due to its excellent safety performance and good price advantage. However, the current spinel lithium manganese oxide cathode material cannot fully meet the needs of electric vehicles, and the technical difficulties mainly include the following: 1) The cycle stability of the spinel lithium manganese oxide cathode material is not good; 2)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62
CPCH01M4/505H01M4/62Y02E60/10
Inventor 刘向峰张继成张恒胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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