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Doped and coated composite modified lithium cobalt oxide LCMO@BT and preparation method and application thereof

A kind of technology of lithium cobaltate and lithium cobaltate, applied in the direction of active material electrode, positive electrode, structural parts, etc., can solve the problems of unsatisfactory requirements, insignificant effect, and incapable of industrialization, and achieve low cost and simple and reliable synthesis process control, short-term effect

Pending Publication Date: 2021-06-04
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the existing modification methods have disadvantages such as high cost and insignificant effect, and cannot meet the requirements of the battery industry for lithium cobalt oxide.
At present, the working voltage of the existing lithium cobalt oxide cathode materials is mostly 4.2V, which has the problem of low energy density.
At high pressure, the cycle life is short, the rate performance is poor, and it is not yet industrialized

Method used

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  • Doped and coated composite modified lithium cobalt oxide LCMO@BT and preparation method and application thereof
  • Doped and coated composite modified lithium cobalt oxide LCMO@BT and preparation method and application thereof
  • Doped and coated composite modified lithium cobalt oxide LCMO@BT and preparation method and application thereof

Examples

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Embodiment 1

[0069] by LiCo 0.99 Mg 0.01 o 2 The chemical formula lithium carbonate 0.9698g (for preventing the volatilization of lithium source, prepares by the mol ratio of excessive 5%), magnesium acetate 0.0536g and tricobalt tetroxide 2.0067g are poured in the stainless steel ball mill jar. Add about 1.0 mL of absolute ethanol, and ball mill at a speed of 160 r / min for 2 h. Subsequently, the material was put into an oven at 70°C for 30 min to remove ethanol. After grinding, the mixture was pre-fired at 600°C for 3 hours in a muffle furnace, and cooled with the furnace. Grinding, calcining the calcined product at 900°C for 12h (5°C / min heating), cooling with the furnace to obtain lithium cobalt oxide doped with 1% magnesium.

[0070] Prepare 0.0735 g of barium hydroxide and 145 uL of tetrabutyl titanate at a molar ratio of 1:1; weigh 2.0 g of lithium cobaltate doped with magnesium according to the mass ratio of the total mass of barium-titanium double metal oxide to lithium cobalta...

Embodiment 2

[0072] The experimental method of this embodiment is basically the same as that of Example 1. The magnesium source used in this embodiment is magnesium nitrate, the lithium source is lithium nitrate, and the doping molar weight of magnesium is 0.05%. The mass ratio of doped lithium cobaltate is 0.03.

Embodiment 3

[0074] The experimental method of this embodiment is basically the same as that of Example 1. The magnesium source used in this embodiment is magnesium oxide, the lithium source is lithium nitrate, and the doping molar weight of magnesium is 3%. The mass ratio of doped lithium cobaltate is 0.07.

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Abstract

The invention discloses doped and coated composite modified lithium cobalt oxide LCMO@BT and a preparation method and application thereof. The method comprises: ball-milling and uniformly mixing a magnesium compound, a cobalt compound and a lithium salt; and presintering the mixture, calcining at high temperature, and cooling to obtain the magnesium-doped lithium cobalt oxide; then adding barium salt into the weak acid aqueous solution, and heating and stirring until the barium salt is dissolved; and sequentially adding titanate and magnesium-doped lithium cobalt oxide, heating, uniformly stirring, standing for layering, pouring out supernate, drying and carrying out vacuum drying; and calcining the mixture at a high temperature, and cooling to obtain a product LCMOS@BT which can be used as an ultrahigh-voltage lithium cobalt oxide positive electrode material of a lithium ion battery. The method provided by the invention has the advantages of cheap and easily available raw materials, low cost, short calcination time and high production efficiency, is very easily used for large-scale industrial production, and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for preparing an ultra-high-voltage lithium cobaltate cathode material for lithium ion batteries, that is, a doping-coated composite modified lithium cobaltate LCMO@BT. Background technique [0002] Since rechargeable lithium-ion batteries entered the consumer market in the early 1990s, they have transformed global communications in a way that revolutionized portable electronics. Lithium-ion batteries (LIBs) have largely contributed to the mobility revolution, meeting our growing demands for a mobile life. John B. Goodenough, M. Stanley Whittingham and Akira Yoshino's great contribution to the development of lithium-ion batteries may also be the reason why they won the 2019 Nobel Prize in Chemistry. Lithium ion was first commercialized by Sony Corporation in 1991 as lithium cobalt oxide (LiCoO 2 ) is the positive pole, and petroleum coke is the negative pol...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M4/364H01M10/0525H01M2004/028Y02E60/10
Inventor 胡炳文胡蓓耿福山李超赵冲林洋邱晴张玮廖昱鑫
Owner EAST CHINA NORMAL UNIV
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