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Preparation method and application of high-purity lithium cobalt oxide cathode material

A pure lithium cobalt oxide, cathode material technology, applied in chemical instruments and methods, battery electrodes, cobalt compounds, etc., can solve the problems of high equipment requirements, large investment, etc., to achieve high purity, high specific capacity, and cycle capacity does not decay Effect

Inactive Publication Date: 2016-07-06
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrothermal method has high product purity, but the high temperature and high pressure system requires high equipment requirements and large investment

Method used

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  • Preparation method and application of high-purity lithium cobalt oxide cathode material
  • Preparation method and application of high-purity lithium cobalt oxide cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1.6g of cobalt tetroxide, 0.2g of PVDF and 0.2g of acetylene black, grind them in a mortar for half an hour and mix well, take 0.2g of the mixture and put it into a mold, and press it under 20MPa for 1 minute to form a tablet. Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on a battery tester, and discharge it at a constant current of 0.05C to a capacity of 53.42mAh. The lithium intercalated cobalt tetroxide was taken out and kept in a muffle furnace at 550° C. for 15 hours to obtain lithium cobalt oxide.

[0033] Mix the obtained lithium cobaltate with the conductive agent acetylene black and the binder PVDF at a mass ratio of ...

Embodiment 2

[0036] Weigh 12g of cobalt tetroxide, 4g of PVDF, 2g of acetylene black and 2g of SuperP, put them into a 100ml ball mill jar with a ball-to-material ratio of 3:1, grind for 2 hours and mix well, take 0.2g of the mixture and put it into a mold, press it under 15MPa for 1 minute to form a tablet . Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on the battery tester, and discharge it at a constant current of 0.05C to a capacity of 40.07mAh. The lithium intercalated cobalt tetroxide was taken out, and kept in a muffle furnace at 800° C. for 8 hours to obtain lithium cobalt oxide.

[0037] Mix the obtained lithium cobalt oxide with the conducti...

Embodiment 3

[0040] Weigh 1.8g of cobalt tetroxide, 0.1g of PVDF and 0.1g of carbon nanotubes, grind them in a mortar for half an hour and mix well, take 0.2g of the mixture and put it into a mold, and press it under 30MPa for 1 minute to form a tablet. Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on a battery tester, and discharge it at a constant current of 0.05C to a capacity of 60.10mAh. The lithium intercalated cobalt tetroxide was taken out, and kept in a muffle furnace at 400° C. for 24 hours to obtain lithium cobalt oxide.

[0041] Mix the obtained lithium cobalt oxide with the conductive agent acetylene black and the binder PVDF at a mass rati...

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Abstract

The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method and application of a high-purity lithium cobalt oxide cathode material. The invention discloses a preparation method of the high-purity lithium cobalt oxide cathode material and a lithium ion battery prepared from the high-purity lithium cobalt oxide cathode material. The preparation method comprises the following steps: embedding cobaltosic oxide into lithium ions by using an electrochemical method, and annealing, thereby obtaining the high-purity lithium cobalt oxide cathode material. By controlling the discharge amount, the ratio of lithium to manganese can be precisely controlled, and thus the high-purity lithium cobalt oxide cathode material can be prepared. As the cathode of the lithium ion battery, the lithium cobalt oxide prepared by using the preparation method is very good in cycle performance.

Description

(1) Technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method and application of a high-purity lithium cobalt oxide positive electrode material. (2) Background technology [0002] LiCoO 2 It is a good positive electrode material in lithium-ion batteries. It has the advantages of high working voltage, stable discharge, high specific energy, and good cycle performance. It is suitable for large-flow discharge and lithium-ion insertion and extraction. It is the first in lithium-ion batteries use. [0003] At present, the common preparation methods of lithium cobaltate mainly include solid-state reaction method, sol-gel method and hydrothermal reaction method. The traditional solid-state reaction synthesis of lithium cobaltate requires long-term calcination at a high temperature above 850°C, resulting in a relatively large particle size and uneven chemical composition. Lithium salts volatilize at high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/525H01M10/0525
CPCC01G51/42C01P2002/72C01P2006/40H01M4/525H01M10/0525Y02E60/10
Inventor 李丽赵成龙张庆朋王瑛王龙王超武陈建伟于文倩
Owner SHANDONG YUHUANG NEW ENERGY TECH
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