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Modified lithium cobaltate and preparation method thereof, lithium ion battery and formation method thereof

A lithium ion battery, lithium cobalt oxide technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as poor high temperature resistance, poor conductivity of positive electrode materials, and low energy density

Active Publication Date: 2020-10-27
EVE ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high temperature resistance of the existing coated lithium cobalt oxide is still poor, which makes the conductivity of the positive electrode material poor, and the structure stability of the coated lithium cobalt oxide is poor at a high voltage of 4.45V, so that The high-temperature storage performance and high-temperature cycle performance of lithium-ion batteries are poor
At the same time, the energy density of existing lithium-ion batteries is low

Method used

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  • Modified lithium cobaltate and preparation method thereof, lithium ion battery and formation method thereof
  • Modified lithium cobaltate and preparation method thereof, lithium ion battery and formation method thereof
  • Modified lithium cobaltate and preparation method thereof, lithium ion battery and formation method thereof

Examples

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preparation example Construction

[0019] For example, a preparation method of modified lithium cobaltate, the preparation method of the modified lithium cobaltate comprises the following steps: three cobalt tetroxide, lithium carbonate, nano-magnesium oxide in molar ratio Li / Co=1.04~1.08, Mg / Co =0.024~0.027 ratio mixed to obtain the first mixture, the first mixture is carried out the first sintering operation, the first intermediate product is obtained; three cobalt tetroxide, lithium carbonate, nano-titanium dioxide molar ratio Li / Co=1.001~1.004 , Ti / Co=0.024~0.0027 after mixing to obtain a second mixture, the second mixture is subjected to a second sintering operation to obtain a second intermediate product; the first intermediate product and the second intermediate product Mix and configure the first suspension, add magnesium acetate alcohol solution to the first suspension to carry out the first reaction operation to obtain the third intermediate product, carry out the first drying operation on the third in...

Embodiment 1

[0088] A lithium-ion battery with high energy density, including a positive electrode sheet, a negative electrode sheet, a separator between the positive electrode sheet and the negative electrode sheet, and an electrolyte, the charge and discharge voltage range is 3V-4.45V, and the positive electrode is doped with double-coated precursor Miscellaneous modified lithium cobaltate is used as active material, and described modified lithium cobaltate is prepared by the following method:

[0089] 1) Mix battery-grade cobalt tetroxide, lithium carbonate, and nano-magnesium oxide at a molar ratio of Li / Co=1.07 and Mg / Co=0.026, then sinter at 570°C for 8 hours, and then sinter at 900°C for 22 hours. Get the first intermediate product.

[0090] 2), battery-grade cobalt tetroxide, lithium carbonate, and nano-titanium dioxide are mixed in a molar ratio of Li / Co=1.002 and Ti / Co=0.026, and then sintered at 570°C for 10 hours, and then sintered at 920°C for 24 hours to obtain second interm...

Embodiment 2

[0101] The difference from Example 1 is:

[0102] In the positive electrode slurry, lithium cobalt oxide: conductive carbon: PVDF binder is 98.5: 0.8: 0.7, in the negative electrode slurry, graphite is used as the active material, wherein, graphite: SBR binder: CMC binder: Conductive carbon is 97.6: 1: 1: 0.4.

[0103] In the described electrolyte, ethylene carbonate (EC): ethyl methyl carbonate (EMC): diethyl carbonate (DEC): propylene carbonate (PC): propyl propionate (PP): fluorobenzene (FB) = 20:15:15:20:10:10, the lithium salt is lithium hexafluorophosphate, the concentration is 1.15mol / L. The electrolyte contains the following additives: 1% ethylene sulfate (DTD), 2% fluoroethylene carbonate (FEC), 3% difluoroethylene carbonate (DFEC), 1% ethylene carbonate (VEC ), 2% succinonitrile (SN) and 0.2% adiponitrile (ADN), 0.8% diethylene glycol bispropionitrile ether (EGBE), 3% lithium bisoxalate borate (LIBOB), 0.2% Methylene methane disulfonate (MMDS), 0.8% lithium fluoro...

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Abstract

The invention discloses modified lithium cobalt oxide, a preparation method of the modified lithium cobalt oxide, a lithium ion battery and a formation method of the lithium ion battery. The preparation method comprises the following steps: mixing cobaltosic oxide, lithium carbonate and nanometer magnesia, and carrying out first sintering operation to obtain a first intermediate product; mixing cobaltosic oxide, lithium carbonate and nanometer titania, and carrying out second sintering operation to obtain a second intermediate product; mixing the first intermediate product and the second intermediate product to configure first suspension liquid, adding a magnesium acetate alcoholic solution to obtain a third intermediate product, carrying out first drying operation, and carrying out first heat treatment; using the third intermediate product after the operation of the first heat treatment to configure second suspension liquid, adding an aluminum nitrate solution and a diammonium hydrogen phosphate solution in sequence to carry out second reaction operation to obtain a fourth intermediate product, and carrying out second heat treatment operation to obtain the modified lithium cobalt oxide. When the modified lithium cobalt oxide is applied to the lithium ion battery, the modified lithium cobalt oxide is applicable to 4.45 V high voltage, high temperature storage performance and high temperature cycle performance of the lithium ion battery can be relatively high, and the energy density of the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a modified lithium cobaltate and a preparation method thereof, a lithium ion battery and a formation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic information equipment, such as in mobile communications, mobile computers, electric vehicles, aerospace, military fields, biomedical engineering, etc. With the development of science and technology, people have higher and higher requirements for lithium-ion batteries, such as higher energy density, longer cycle life, and fast charging. Existing lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, and an electrolyte. The positive electrode sheet includes a positive electrode slurry and a positive electrode metal current collector, and the negative electrode sheet includes a negative electrode slurry and a negative electrode metal current col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/36H01M10/0525H01M4/04
CPCH01M4/04H01M4/0471H01M4/362H01M4/525H01M10/0525Y02E60/10
Inventor 刘荣江赵磊王理
Owner EVE ENERGY CO LTD
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