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A fluorine-modified high-voltage lithium cobaltate, its preparation method and battery

A high-voltage, lithium cobalt oxide technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of reduced discharge capacity and complicated processes, and achieve the effects of improving high-temperature storage performance and suppressing gas production.

Active Publication Date: 2022-04-15
HUNAN CHANGYUAN LICO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fluorine-modified high-voltage lithium cobaltate, its preparation method and battery, so as to solve the problems of complex process and reduced discharge capacity in the prior art

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  • A fluorine-modified high-voltage lithium cobaltate, its preparation method and battery

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preparation example Construction

[0026] The preparation method of the fluorine-modified high-voltage lithium cobaltate of a specific embodiment of the present invention comprises the following steps:

[0027] (1) Mix Al pre-doped tricobalt tetroxide precursor, lithium carbonate, and additives evenly, and sinter respectively to form a large-grain pre-sintered material and a small-particle pre-sintered material.

[0028] Cobalt trioxide precursor can adopt cobalt chloride or cobalt sulfate solution, add sodium hydroxide or ammonium salt to carry out precipitation, add aluminum chloride or aluminum sulfate at the same time in the precipitation process to realize the pre-doping of Al, wherein the pre-doping amount of Al is 0-0.8% by weight of the tricobalt tetroxide precursor, preferably 0.3-0.6%. Al doping can stabilize the structural stability of the material under high voltage, and pre-doping in the precursor can ensure that the Al element enters the crystal lattice uniformly.

[0029] The chemical formula of...

Embodiment

[0043] This embodiment provides a fluorine-modified high-voltage lithium cobaltate and its preparation method, the steps are as follows:

[0044] (1) Cobalt oxide with an Al pre-doping amount of 0.5% is mixed with lithium carbonate (Li / Co molar ratio is 1.05:1), dilanthanum trioxide (La / Co molar ratio is 0.004:1), magnesium oxide ( Mg / Co molar ratio is 0.003:1), titanium dioxide (Ti / Co molar ratio is 0.002:1), aluminum fluoride (F / O molar ratio is 0.002:1), and fully mixed to obtain a uniformly dispersed primary mixture 1.

[0045] (2) Cobalt oxide with an Al pre-doping amount of 0.4%, lithium carbonate (Li / Co molar ratio is 1.02:1), dilanthanum trioxide (La / Co molar ratio is 0.004:1), magnesium oxide ( Mg / Co molar ratio is 0.003:1), titanium dioxide (Ti / Co molar ratio is 0.002:1), aluminum fluoride (F / O molar ratio is 0.002:1), and fully mixed to obtain a uniformly dispersed primary mixture 2.

[0046] (3) Sinter the primary mixture 1 in an air atmosphere at 1020-1050°C for ...

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Abstract

The invention discloses a fluorine-modified high-voltage lithium cobaltate, a preparation method thereof and a battery. The preparation method comprises: (1) uniformly mixing the precursor of tricobalt tetroxide, lithium carbonate and additives, sintering and crushing them into two particle sizes Pre-sintered material; (2) Mix two kinds of pre-sintered materials with particle sizes, then add fluoride and other coating agents, mix evenly, and perform secondary sintering to prepare the fluorine-modified high-voltage lithium cobaltate. After the fluorine-doped modification of the present invention, the lithium cobalt oxide positive electrode material still maintains a relatively high discharge capacity. After doping and coating modification, the cycle and high temperature storage performance under high voltage are significantly improved, and the irreversible phase transition and gas production are effectively suppressed.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a fluorine-modified high-voltage lithium cobaltate, a preparation method and a battery. Background technique [0002] In recent years, 3C electronics and consumer lithium-ion batteries have achieved sustained and stable development for decades, and will continue to maintain a steady growth trend. With the development and popularization of next-generation electronic consumer products such as 5G mobile phones, people are more interested in lithium-ion batteries. The safety performance and energy density of batteries put forward higher requirements, and a new rapid growth cycle is expected. Lithium cobalt oxide cathode material has always been the first choice for 3C consumer battery cathode materials because of its high operating voltage, high first-cycle coulombic efficiency, stable cycle, and high volumetric energy density, and it is also the most competitive in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00H01M4/525H01M4/62H01M10/0525
CPCC01G51/42H01M4/525H01M4/62H01M10/0525C01P2006/40Y02E60/10
Inventor 唐朝辉吴涛周友元黄承焕周耀熊学
Owner HUNAN CHANGYUAN LICO CO LTD
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