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Preparation method of lithium ion conductor-coated lithium-ion battery lithium cobaltate cathode material

A technology for coating lithium cobalt oxide and battery lithium cobalt oxide, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high rate performance, insignificant effect, poor conductivity, etc., and achieve easy control of reaction conditions. , low cost and high production efficiency

Active Publication Date: 2016-01-20
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology

These methods can improve cycle stability to a certain extent, especially under the 4.4V voltage cut-off condition, but the effect is not obvious under the 4.5V voltage cut-off condition, and these traditional oxide coating materials are poor in lithium ion conductivity. Will affect the high rate performance of the material

Method used

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  • Preparation method of lithium ion conductor-coated lithium-ion battery lithium cobaltate cathode material
  • Preparation method of lithium ion conductor-coated lithium-ion battery lithium cobaltate cathode material
  • Preparation method of lithium ion conductor-coated lithium-ion battery lithium cobaltate cathode material

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preparation example Construction

[0026] There are two different technical schemes for the preparation method of lithium-ion conductor-coated lithium cobalt oxide high-voltage positive electrode material of lithium-ion battery provided by the present invention. The first one is to use hydrothermal coating, which includes the following steps:

[0027] (1) Preparation of oxalate precursor:

[0028] CoSO 4 , Co(NO 3 ) 2 Or CoCl 2 Etc.) Dissolve in 50mL of water, make the molar concentration of metal Co ions 1~3mol / L to obtain a mixed solution of metal ions; configure H with a molar concentration of 1~3mol / L 2 C 2 O 4 Solution 50mL, under magnetic stirring, the above H 2 C 2 O 4 The solution was added to the above-mentioned metal ion mixed solution to produce a precipitate. After stirring for 2 hours, centrifuged, the precipitate was washed twice with deionized water and absolute ethanol, and the precipitate was dried in an oven at 80°C for 12 hours to obtain The oxalate precursor, the molecular formula of the oxalate p...

Embodiment 1

[0042] (1) Cobalt metal salt CoSO 4 Dissolve in 50mL of water to make the molar concentration of metal Co ions 3mol / L to obtain a metal ion solution, and then configure H with a molar concentration of 3mol / L 2 C 2 O 4 Solution 50mL, under magnetic stirring, the H 2 C 2 O 4 The solution was added to the metal ion mixed solution to produce a precipitate. After stirring for 2 hours, centrifuged, the precipitate was washed twice with deionized water and absolute ethanol, and the precipitate was dried in an oven at 80°C for 12 hours to obtain grass The molecular formula of oxalate precursor is: CoC 2 O 4 ·2H 2 O;

[0043] (2)ZrO 2 Synthesis of coated oxalate precursor: Weigh 500 mg of the oxalate precursor obtained above and disperse in 10 mL of absolute ethanol, stir and ultrasonically disperse. According to the molar ratio of Zr:Co=3:100, Zr(OC 4 H 9 ) 4 The absolute ethanol solution, stir and disperse evenly. Then the mixed solution was transferred to a completely dried hydrotherma...

Embodiment 2

[0048] (1) The metal salt of cobalt Co(NO 3 ) 2 Dissolve in 50mL of water, make the molar concentration of metal Co ions 2mol / L to obtain a metal ion solution, and then configure H with a molar concentration of 2mol / L 2 C 2 O 4 Solution 50mL, under magnetic stirring, the H 2 C 2 O 4 The solution was added to the metal ion mixed solution to produce a precipitate. After stirring for 2 hours, centrifuged, the precipitate was washed twice with deionized water and absolute ethanol, and the precipitate was dried in an oven at 80°C for 12 hours to obtain grass The molecular formula of oxalate precursor is: CoC 2 O 4 ·2H 2 O;

[0049] (2)TiO 2 Synthesis of coated oxalate precursor: Weigh 2 g of the oxalate precursor obtained above and disperse it in 25 mL of absolute ethanol, add 100 μL of ammonia, stir and ultrasonically disperse. According to the molar ratio of Ti:Co=3:100, the concentration of Ti(OC 4 H 9 ) 4 The absolute ethanol solution, stir and disperse evenly. Then the mixed solu...

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Abstract

The invention relates to a preparation method of a lithium ion conductor-coated lithium-ion battery lithium cobaltate cathode material, and belongs to the technical field of new energy sources. Hydrothermal method coating or normal temperature stirring method coating is adopted by the method; and the method specifically comprises three steps: preparation of an oxalate precursor, preparation of an oxide-coated oxalate precursor and preparation of the lithium ion conductor-coated lithium cobaltate material. According to the method, the bonding strength between a cladding layer and main-phase lithium cobaltate can be improved; the cladding layer is uniform in thickness; and the rate capability and the cycling stability of the lithium ion battery, particularly the rate capability are significantly improved. The method provided by the invention is simple in synthetic process, high in production efficiency and suitable for large-scale production, and has the advantages of available raw materials required for reactants, no toxicity and low cost; a special protection is not needed in the production process; reaction conditions are easy to control; and the obtained product has the advantages of high yield, good result repeatability and the like.

Description

Technical field [0001] The invention relates to a method for preparing a lithium ion conductor coated lithium cobalt oxide positive electrode material of a lithium ion battery, and belongs to the technical field of new energy. Background technique [0002] Lithium cobalt oxide cathode material has been one of the most successful commercial lithium ion battery cathode materials in the past 20 years due to its excellent volumetric energy density and cycle stability. However, the current commercial lithium cobalt oxide cathode material has a capacity of only 140mAhg -1 , It has been unable to meet the requirements of the new generation of electronic products for high energy density, high capacity, smaller volume and longer standby time. In fact, the theoretical capacity of lithium cobalt oxide cathode material is 274mAhg -1 , But it needs a higher voltage (such as 4.5V) to release a higher capacity. High voltage often causes irreversible structural changes and serious side reaction...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 刘向峰张继成胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES