Preparation method of high-voltage lithium cobalt oxide cathode material

A cathode material, lithium cobalt oxide technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of increased side reactions, degradation of cycle performance, easy cracking, etc., to achieve uniform distribution and product performance improvement.

Active Publication Date: 2019-02-12
HUNAN CHANGYUAN LICO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High-voltage lithium cobalt oxide with single crystal morphology is generally obtained by sintering at high temperature (>1050°C) and long time (>12h) in one sintering process. The specific surface area of ​​the single crystal material obtained by this method is smaller than that of The side reaction of the electrolyte is reduced, and the cycle performance is improved; however, due to the large single particle size, the material has poor rate and low first Coulombic efficiency, which reduces the energy utilization rate of the material
The high-voltage lithium cobalt oxide with a similar sing

Method used

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  • Preparation method of high-voltage lithium cobalt oxide cathode material
  • Preparation method of high-voltage lithium cobalt oxide cathode material
  • Preparation method of high-voltage lithium cobalt oxide cathode material

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Embodiment 1

[0064] A preparation method of the high-voltage lithium cobaltate positive electrode material of the present invention, comprising the following steps:

[0065] (1) Cobalt tetroxide, lithium carbonate, lanthanum oxide, grain refiner TiO 2 and flux Mg(OH) 2 Carry out batching, adopt coulter type mixer to mix, obtain primary mixture; wherein the amount of the Al metal element doped in the tricobalt tetroxide is 0.50wt% of the lithium cobalt oxide cathode material weight, the lithium element in the lithium carbonate and the cobalt in the tricobalt tetroxide The molar ratio of the elements is n(Li):n(Co)=1.07:1, the doping amount of La is 0.1wt% of the weight of the lithium cobalt oxide cathode material, and the grain refiner TiO 2 The addition amount is 0.1wt% of lithium cobalt oxide cathode material weight, flux Mg(OH) 2 The addition amount is 0.2wt% of the weight of the lithium cobaltate positive electrode material; Cobalt tetroxide uniformly doped with Al ions is prepared by...

Embodiment 2

[0082] A preparation method of the high-voltage lithium cobaltate positive electrode material of the present invention, comprising the following steps:

[0083] (1) Cobalt tetroxide, lithium carbonate, aluminum oxide, and grain refiner TiO are uniformly doped with Zr ions 2 and flux Mg(OH) 2 Carry out batching, adopt coulter type mixer to mix, obtain primary mixture; Wherein, the amount of the Zr metal element doped in tricobalt tetroxide is 0.50wt% of the weight of lithium cobalt oxide cathode material, the lithium element in lithium carbonate and tricobalt tetroxide The molar ratio of the cobalt element is n(Li):n(Co)=1.06:1, the doping amount of Al is 0.1wt% of the weight of the lithium cobalt oxide cathode material, and the grain refiner TiO 2 The addition amount is 0.1wt% of lithium cobalt oxide cathode material weight, flux Mg(OH) 2 The addition is 0.1wt% of the weight of the lithium cobaltate positive electrode material; the preparation method of the used cobalt tetro...

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Abstract

The invention discloses a preparation method of a high-voltage lithium cobalt oxide cathode material which comprises the steps: (1) mixing cobaltosic oxide containing doped element M, a lithium source, oxide containing doped element M', a grain refiner and a fluxing agent to obtain a primary mixture; (2) sintering and smashing the primary mixture to obtain primary sintered powder; (3) mixing the primary sintered powder with a coating material to obtain a secondary mixture; (4) sintering and smashing the secondary mixture to obtain the lithium cobalt oxide cathode material. According to the preparation method disclosed by the invention, the problem of microscale segregation of distribution of doped elements in the product is solved by two modes of doped element premixing and dry-method mixing; a coulter type mixing technology is utilized to solve the problem of segregation of different matters in material mixing; the grain refiner and the fluxing agent are combined for use to synthesizea material in a mixed morphology; technologies such as dual effects of doped element surface crystallization catalysis and the coating material and the like are utilized; thus, performance of the high-voltage lithium cobalt oxide is obviously improved.

Description

technical field [0001] The invention belongs to the anode material of a lithium ion battery, in particular to a preparation method of a high-voltage lithium cobaltate anode material. Background technique [0002] With the rapid development of electronic technology, the replacement of 3C products is becoming more and more frequent, and the development of lithium-ion battery cathode materials with higher energy density and better cycle performance has become the goal pursued by the lithium battery industry. Lithium cobalt oxide (LiCoO 2 ) has the advantages of high specific capacity, high compaction density, high volumetric energy density, and simple production process. It is widely used in consumer electronics products such as smartphones, tablet computers, and notebooks, and has become the most commonly used lithium-ion battery cathode for commercialization. one of the materials. The theoretical capacity of lithium cobalt oxide is 274mAh / g. During normal use, only half of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 廖达前曾文赛胡柳泉周友元周耀
Owner HUNAN CHANGYUAN LICO CO LTD
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