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Lithium-ion battery lithium cobalt oxide cathode material and coating method thereof

A battery lithium cobalt oxide, positive electrode material technology, applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve problems that are difficult to meet the requirements of practical applications, to improve cycle stability, reduce direct contact, and improve ion diffusion speed effect

Active Publication Date: 2022-04-29
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle stability and safety performance of lithium cobaltate can be effectively improved through the change of material microstructure and the existence of surface coating phase, but with the continuous increase of cut-off voltage (for example, 4.6V), the additives currently used are difficult to meet the practical application. needs to be further improved

Method used

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  • Lithium-ion battery lithium cobalt oxide cathode material and coating method thereof
  • Lithium-ion battery lithium cobalt oxide cathode material and coating method thereof
  • Lithium-ion battery lithium cobalt oxide cathode material and coating method thereof

Examples

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preparation example Construction

[0052] When the positive electrode material is prepared by a dry method for lithium ion battery lithium cobaltate positive electrode material, the preparation method comprises the following steps:

[0053] 1) Prepare the mixture precursor

[0054] In the present invention, the mixture precursor is prepared by fully mixing the lithium cobaltate particles and the reaction raw materials.

[0055] Wherein, the reaction raw materials include lithium salts or boron-containing compounds, stannous oxide or tin oxide, and ammonium dihydrogen phosphate, and the reaction raw materials generate tin-containing compounds on the surface of lithium cobaltate particles under high-temperature sintering conditions.

[0056] The lithium salt is selected from lithium carbonate, lithium hydroxide, Li 2 B 4 o 7 One or more of them, lithium carbonate is preferably used;

[0057] The boron-containing compound is selected from B 2 o 3 、H 3 BO 3 , Li 2 B 4 o 7 One or more of, preferably B 2 ...

Embodiment 1

[0088] Use a ball mill to pulverize the lithium carbonate, tin oxide and ammonium dihydrogen phosphate until the D90 is between 100-250nm, and then stop the pulverization.

[0089] Weigh lithium carbonate (Li 2 CO 3 )0.07g, tin oxide (SnO 2 )0.03g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 0.65g for mixing, after mixing evenly, add 100g of lithium cobaltate positive electrode and mix again to obtain the mixture precursor.

[0090] The above mixture precursor was placed in a tube furnace containing Ar protective gas, and sintered at a high temperature of 850° C. for 8 hours to prepare a lithium cobaltate cathode material coated with a tin-containing compound on the surface.

[0091] Wherein, the coating amount of the tin-containing compound on the surface of the lithium cobalt oxide positive electrode material is 1%.

Embodiment 2

[0093] The boron oxide, tin oxide and ammonium dihydrogen phosphate were respectively pulverized using a ball mill until the D90 was between 10-100 nm, and the pulverization was stopped.

[0094] Weigh tin oxide (SnO 2 )0.88g, boron oxide (B 2 o 3 )0.1g with NH 4 h 2 PO 4 0.35g was mixed, and after mixing evenly, 100g of lithium cobaltate cathode material was added and mixed again to obtain a mixture precursor.

[0095] Put the above mixture precursor in the H 2 The sintering reaction was carried out at a high temperature of 700° C. for 8 hours in a tube furnace with shielding gas to prepare a lithium cobalt oxide positive electrode material coated with a tin-containing compound on the surface.

[0096] Wherein, the coating amount of the tin-containing compound on the surface of the lithium cobalt oxide positive electrode material is 1%.

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Abstract

The invention provides a lithium cobalt oxide positive electrode material coated with a tin compound on the surface, and the positive electrode material can be prepared by a dry method or a wet method. The coating layer effectively reduces the direct contact between lithium cobaltate particles and the electrolyte, reduces the occurrence of side reactions and the dissolution of cobalt in the electrolyte, and improves the utilization rate of the positive electrode material during the cycle, thereby effectively improving Cycling stability and Coulombic efficiency of lithium cobalt oxide cathode.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a lithium cobalt oxide positive electrode material for lithium ion batteries and a coating method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in 1991, lithium-ion batteries have experienced a long period of development and innovation. As the first generation of commercial lithium-ion battery cathode material, lithium cobalt oxide has the advantages of high working voltage, stable voltage platform, good cycle performance and simple production process, and has occupied an absolute advantage in electronic consumer products so far. [0003] Due to the low abundance of cobalt (Co) in nature, the storage capacity is small, and the price is relatively high; and, in practical applications, LiCoO 2 The safety and overcharge resistance of the battery need to be improved. In recent years, with the continu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 沈恋白珍辉魏卫刘海强高志平卢兴华赵广彬周玉林沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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