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Doped high-voltage lithium cobalt oxide cathode material and preparation method thereof

A cathode material, high voltage technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited improvement of electrochemical performance of lithium cobalt oxide cathode materials, many processes, capacity loss of lithium cobalt oxide cathode materials, etc. The effect of electrochemical performance, good repeatability, and excellent cycle stability

Inactive Publication Date: 2020-10-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, the lithium cobaltate cathode material is doped with elements during the preparation process, and then coated. There are many processes, and because the coating layer is an inactive material, it is easy to cause the loss of the capacity of the lithium cobaltate cathode material.
The existing modification methods often cannot meet the requirements of lithium cobalt oxide with excellent cycle stability under high voltage, and have limited improvement on the electrochemical performance of lithium cobalt oxide cathode materials.

Method used

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  • Doped high-voltage lithium cobalt oxide cathode material and preparation method thereof
  • Doped high-voltage lithium cobalt oxide cathode material and preparation method thereof
  • Doped high-voltage lithium cobalt oxide cathode material and preparation method thereof

Examples

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Embodiment 1

[0035] A doped high-voltage lithium cobalt oxide positive electrode material, the preparation method of which comprises the following steps:

[0036] 1) Weigh 36g cobalt sulfate heptahydrate, dissolve it in deionized water, prepare a cobalt sulfate solution with a concentration of 15wt%, and add 176g of sodium carbonate solution with a concentration of 8wt% (which contains 0.14g oxalic acid) under stirring in a water bath at 55°C. Sodium), and stirred for 2h, let stand, filter, wash, and vacuum dry at 110°C to obtain the precursor;

[0037] 2) Calcining the precursor obtained in step 1) in an air atmosphere at 700°C for 3 hours to obtain tricobalt tetroxide;

[0038] 3) Weigh the obtained cobalt tetroxide, lithium carbonate, zinc oxide, yttrium carbonate and terbium carbonate according to the molar ratio of Co, Li, Zn, Y, Tb as 1:1.05:0.005:0.0005:0.005, mix them uniformly, and then mix the obtained mixture Put it into a muffle furnace, calcinate at a constant temperature of ...

Embodiment 2

[0041] A doped high-voltage lithium cobalt oxide positive electrode material, the preparation method of which comprises the following steps:

[0042] 1) Weigh 36g cobalt sulfate heptahydrate, dissolve it in deionized water, prepare a cobalt sulfate solution with a concentration of 15wt%, and add 176g of sodium carbonate solution with a concentration of 8wt% (which contains 0.14g oxalic acid) under stirring in a water bath at 55°C. Sodium), and stirred for 2h, let stand, filter, wash, and vacuum dry at 110°C to obtain the precursor;

[0043] 2) Calcining the precursor obtained in step 1) in an air atmosphere at 700°C for 3 hours to obtain tricobalt tetroxide;

[0044] 3) Weigh the obtained cobalt tetroxide, lithium carbonate, zinc oxide, yttrium carbonate and terbium carbonate according to the molar ratio of Co, Li, Zn, Y, Tb as 1:1.05:0.002:0.0005:0.005, mix them uniformly, and then mix the obtained mixture Put it into a muffle furnace, calcinate at a constant temperature of ...

Embodiment 3

[0046] A doped high-voltage lithium cobalt oxide positive electrode material, the preparation method of which comprises the following steps:

[0047] 1) Weigh 36g cobalt sulfate heptahydrate, dissolve it in deionized water, prepare a cobalt sulfate solution with a concentration of 15wt%, and add 176g of sodium carbonate solution with a concentration of 8wt% (which contains 0.14g oxalic acid) under stirring in a water bath at 55°C. Sodium), and stirred for 2h, let stand, filter, wash, and vacuum dry at 110°C to obtain the precursor;

[0048] 2) Calcining the precursor obtained in step 1) in an air atmosphere at 700°C for 3 hours to obtain tricobalt tetroxide;

[0049] 3) Weigh the obtained cobalt tetroxide, lithium carbonate, zinc oxide, yttrium carbonate and terbium carbonate according to the molar ratio of Co, Li, Zn, Y, Tb as 1:1.05:0.01:0.01:0.01, mix them uniformly, and then mix the obtained mixture Put it into a muffle furnace, calcinate at a constant temperature of 900°...

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Abstract

The invention discloses a doped high-voltage lithium cobalt oxide cathode material and a preparation method thereof. One or more of a zinc source, a yttrium source, a terbium source and a praseodymiumsource are selected and evenly mixed with a lithium source and a cobalt source, then high-temperature calcination is conducted, and the doped high-voltage lithium cobalt oxide positive electrode material is obtained. In the preparation process of the positive electrode material, Zn, Y, Tb and Pr are doped, so that the structural stability, the cycle life and the safety of the obtained lithium cobalt oxide positive electrode material under high voltage can be effectively improved. The specific discharge capacity of the prepared zinc-yttrium-terbium co-doped lithium cobalt oxide positive electrode material is 185mAh / g and the capacity retention ratio is 98% after 100 circles of circulation at high voltage, the structure is still kept complete after 300 circles, and the zinc-yttrium-terbiumco-doped lithium cobalt oxide positive electrode material can show good cycling stability under the condition of high voltage.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a doped high-voltage lithium cobalt oxide positive electrode material and a preparation method thereof. Background technique [0002] Lithium cobalt oxide is one of the most widely used cathode materials on the market. In recent years, with the continuous development of science and technology, the market has higher and higher requirements for battery energy density, and lithium cobalt oxide cathode materials are developing towards higher charge cut-off voltages. [0003] However, under high voltage, lithium cobalt oxide will lead to the deintercalation of more lithium ions and cause the collapse of the internal structure, which will deteriorate the cycle performance of the battery. The safety of the battery module also poses a great hazard. In order to overcome the problems existing in lithium cobalt oxide under high voltage, the current main r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/58H01M10/0525
CPCH01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 袁良杰王瑞滋李腾童志强
Owner WUHAN UNIV
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