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High-voltage lithium cobaltate positive electrode material, preparation method thereof and lithium-ion secondary battery

A high-voltage lithium cobalt oxide and cathode material technology, applied in the field of electrochemical energy storage, can solve problems such as many processes and poor interface stability, and achieve the effects of improving safety performance, inhibiting phase transition, and improving cycle performance

Inactive Publication Date: 2019-10-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing lithium cobaltate cathode material is doped with elements during the preparation process, and then coated, which is a double-layer structure, with many processes and poor interface stability.

Method used

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  • High-voltage lithium cobaltate positive electrode material, preparation method thereof and lithium-ion secondary battery
  • High-voltage lithium cobaltate positive electrode material, preparation method thereof and lithium-ion secondary battery
  • High-voltage lithium cobaltate positive electrode material, preparation method thereof and lithium-ion secondary battery

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preparation example Construction

[0050] An embodiment of the present invention provides a method for preparing the above-mentioned high-voltage lithium cobaltate cathode material, which includes the following steps:

[0051] S1. Obtain lithium cobalt oxide material.

[0052] The lithium cobaltate material can be commercially available lithium cobaltate material, and can also be prepared by conventional methods, such as high-temperature solid-phase synthesis, sol-gel method, hydrothermal synthesis, precipitation-freezing method, etc., the present invention does not Specific limits.

[0053] S2. Add metal dopant, gelling agent and the lithium cobalt oxide material into the organic solvent, and mix uniformly to obtain a mixture; wherein, the solid content of the lithium cobalt oxide material in the mixture is 10-40 wt%. The sol-gel method is used to process the mixture, the reaction method is simple and the conditions are mild, which can make the mixing of doping elements more uniform, thereby reducing the size...

Embodiment 1

[0063] This embodiment provides a high-voltage lithium cobalt oxide positive electrode material, which is prepared according to the following steps:

[0064] Dissolve lithium hydroxide monohydrate in deionized water to obtain a 0.2 mol / L lithium hydroxide solution, add an equal volume of 0.2 mol / L cobalt nitrate aqueous solution, and continue stirring at 80°C until the water evaporates to dryness to obtain a dry powder , heat-treat the dry powder at 900°C for 12h to obtain lithium cobaltate particles with a particle size of 10-20μm.

[0065] Add 0.2g LiNO to 50g ethanol 3 , 2gZr(NO 3 ) 4 , 0.6gLa(NO 3 ) 3 , 5 g of citric acid and 10 g of lithium cobaltate particles were uniformly mixed by ultrasonic to obtain a mixture. The mixture was continuously stirred at 60°C until a viscous gel was formed, then loaded into a crucible, heat-treated at 200°C for 4 hours, and then sintered at 900°C for 12 hours to obtain a high-pressure lithium cobaltate cathode material.

Embodiment 2

[0067] This embodiment provides a high-voltage lithium cobalt oxide positive electrode material, which is prepared according to the following steps:

[0068] Dissolve lithium hydroxide monohydrate in deionized water to obtain a 0.2 mol / L lithium hydroxide solution, add an equal volume of 0.2 mol / L cobalt nitrate aqueous solution, and continue stirring at 80°C until the water evaporates to dryness to obtain a dry powder , heat-treat the dry powder at 900°C for 12h to obtain lithium cobaltate particles with a particle size of 10-20μm.

[0069] Add 0.2g LiNO to 50g ethanol 3 , 0.6gZr(NO 3 ) 4 , 0.6gLa(NO 3 ) 3 , 5 g of citric acid and 20 g of lithium cobaltate particles were uniformly mixed ultrasonically to obtain a mixture. The mixture was continuously stirred at 60°C until a viscous gel was formed, then loaded into a crucible, heat-treated at 400°C for 4 hours, and then sintered at 900°C for 12 hours to obtain a high-pressure lithium cobaltate cathode material.

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Abstract

The invention provides a high-voltage lithium cobaltate positive electrode material, a preparation method thereof and a lithium-ion secondary battery. The high-voltage lithium cobaltate positive electrode material is a multi-stage core-shell structure and comprises a lithium cobaltate core layer of an alpha-NaFeO2 structure, a composite doped layer and a functional shell layer from the inside to the outside, the general formula of the high-voltage lithium cobaltate positive electrode material is LiCoO2.D-LiCo1-xMxO2.S-Li-La-X-O, x is larger than or equal to 0.01 and smaller than or equal to 0.06, M is one or more elements in the group consisting of Al, Ti, Zr, La, Nb and rare earth elements, and X is one or more elements in the group consisting of Zr, Nb, Sc and Ga. According to the invention, through the high-temperature sintering of the lithium cobaltate core layer coated with the functional shell layer, the material of the functional shell layer is doped into a lithium cobaltate surface layer, therefore, the structure of lithium cobaltate is stabilized, the phase change of the lithium cobaltate in a high-voltage discharge process is inhibited, and the cycle performance and rateperformance are improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, and in particular to a high-voltage lithium cobalt oxide cathode material, a preparation method and a lithium ion secondary battery. Background technique [0002] As a representative secondary battery, lithium ion battery is a general term for batteries with lithium ion intercalation compounds as positive and negative electrode materials. Its working principle is that during the charging process of the battery, lithium ions are intercalated and extracted back and forth between the positive and negative electrode materials, which is vividly called "rocking chair battery". [0003] Lithium cobalt oxide (LiCoO 2 ) is the earliest commercial lithium-ion battery cathode material. Its excellent cycle stability, rate performance and compaction density make it still occupy a large share of the consumer electronics energy storage market. LiCoO 2 Since its discovery, its applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 黄令彭军师晨光武丽娜孙世刚樊晶晶李君涛
Owner XIAMEN UNIV
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