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Doped lithium cobalt oxide with composite cladding layer and its preparation method and application

A technology of lithium cobalt oxide and coating layer, which is applied in the field of lithium ion battery materials, and can solve the problems of poor lithium ion transmission ability and insignificant effect

Active Publication Date: 2021-09-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating of metal oxides and the doping of metal elements have played a role in stabilizing the structure of lithium cobaltate materials and inhibiting the side reactions between lithium cobaltate and electrolyte to a certain extent; however, the effect is not significant.
At the same time, because the coated metal oxide is a non-electrochemically active material, its ability to transport lithium ions is very poor. After coating, the gram capacity and discharge voltage platform of the positive electrode material will be sacrificed, and the positive electrode will be sacrificed to a certain extent. energy density of the material

Method used

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  • Doped lithium cobalt oxide with composite cladding layer and its preparation method and application
  • Doped lithium cobalt oxide with composite cladding layer and its preparation method and application
  • Doped lithium cobalt oxide with composite cladding layer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] Example 1 Gradient doped lithium cobalt oxide sample 1 # preparation of

[0137] Weigh Co 3 o 4 49.15g, add 200mL water, stir to form a dispersion. Prepare 1mol / L ammonia solution. Weigh 2.71g magnesium acetate tetrahydrate, add 13mL water to dissolve; weigh 2.63g cobalt acetate tetrahydrate, add 13mL water to dissolve; prepare 2mol / L LiOH solution and 1mol / L ammonia water mixed solution.

[0138] Continuously input the magnesium acetate solution into the cobalt acetate solution, and stir evenly, and continuously input the formed mixed solution into Co 3 o 4Add 26mL of 2mol / L LiOH solution and 1mol / L ammonia solution to the dispersion at the same time. After the addition, adjust the pH to 11.5 with ammonia water, stir for 4 hours, filter, wash with water three times, and dry at 100°C to obtain the surface concentration gradient package. Coated Mg(OH) 2 The precursor Q1.

[0139] Weigh 10g of the above-mentioned Q1 precursor, and mix the lithium salt and the pre...

Embodiment 2

[0140] Example 2 Gradient doped lithium cobalt oxide sample 2 with transition layer (intermediate layer) # preparation of

[0141] Weigh 50 g of the precursor Q1 in the example, add 200 mL of water, and stir to form a dispersion. Weigh 13.88g of yttrium acetate tetrahydrate and dissolve it in 30mL of water. Prepare 5mol / L LiOH solution and 1mol / L ammonia solution.

[0142] Add yttrium acetate solution and 30mL 5mol / L LiOH solution and 1mol / L ammonia water mixed solution to the dispersion liquid of precursor simultaneously, Y(OH) 5 It settles on the surface of precursor Q1, and the pH of the precipitation is controlled at 12. Stir for 4 hours, filter and wash with water, and dry at 100° C. to obtain composite precursor Q2.

[0143] Weigh 10g of the above-mentioned Q2 precursor, and mix the lithium salt with the precursor at a molar ratio of 1.05:1; weigh LiOH·H 2 O 5.20g, mixed with the precursor Q2 evenly, sintered at 600°C for 6 hours in the air atmosphere, then raised t...

Embodiment 3

[0144] Embodiment 3 Gradient doped lithium cobalt oxide sample 3 with transition layer (intermediate layer) and shell layer # preparation of

[0145] Weigh 50g of precursor Q2, add 200mL of water, and stir to form a dispersion. Weigh 16.07g of manganese acetate tetrahydrate and dissolve it in 30mL of water. Prepare 2mol / L LiOH solution and 1mol / L ammonia solution.

[0146] Manganese acetate solution and 30mL 2mol / L LiOH solution and 1mol / L ammonia water mixed solution are added to the dispersion of precursor Q2 at the same time, Mn(OH) 2 It settles on the surface of the precursor Q2, and the pH of the precipitation is controlled at 10.5. Stir for 4 hours, filter and wash with water, and dry at 100° C. to obtain composite precursor Q3.

[0147] Weigh 10g of the above-mentioned Q3 precursor, mix the lithium salt and the precursor at a molar ratio of 1.05:1, weigh LiOH·H 2 O 5.29g, mixed with precursor Q3 evenly, sintered at 600°C for 6 hours in air atmosphere, then raised t...

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Abstract

This application discloses a doped lithium cobalt oxide with a composite coating layer, which has a particularly stable surface structure as a positive electrode material for a lithium-ion battery, and at the same time, its surface coating layer has electrochemical activity and lithium ion transport capacity. In the lithium-ion battery prepared by it, it can not only block the direct contact between the electrode material and the electrolyte, reduce the side reaction inside the battery, and improve the safety performance. The impedance in increases.

Description

technical field [0001] The application relates to a doped lithium cobalt oxide with a composite coating layer and its preparation method and application, belonging to the field of lithium ion battery materials. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, light weight, green environmental protection and no pollution, etc., and have been widely used in digital products, household appliances, electric vehicles, aerospace, satellites and weaponry, etc., in civilian, aerospace and military fields play an increasingly important role. With the miniaturization and thinning of portable electronic devices such as mobile phones, digital cameras, and notebook computers, the market's requirements for the energy density, electrochemical performance, and safety performance of lithium-ion batteries continue to increase. [0003] LiCoO 2 The production process of the material is simple, and it has the advantages of high voltage platform,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 刘孟毕玉敬姜阳张政刚秦银平王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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