Lithium cobalt oxide material and preparation method thereof, positive plate and lithium ion battery

A technology of lithium cobaltate and lithium niobate, which is applied in the fields of lithium ion batteries, lithium cobaltate materials and their preparation, and positive electrodes, can solve the problems of failure to form a stable and uniform coating layer, adverse cycle stability of lithium cobaltate, and coating In order to achieve the effect of maintaining structural stability and cycle stability, good ionic conductivity, and reducing material interface impedance.

Pending Publication Date: 2022-03-22
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned coating modification has two major problems: poor coating uniformity and poor ionic conductivity, which is not conducive to the cycle stability of lithium cobaltate under high voltage.
[0005] Although it has been reported that the use of fast ion conductors (LATP, LLZO, etc.) can improve the diffusion of lithium ions at the surface interface of lithium cobalt oxide coating, most of them use the method of mixing fast ion conductors and lithium cobalt oxide, which fails to form a stable and uniform cladding

Method used

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  • Lithium cobalt oxide material and preparation method thereof, positive plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of lithium cobaltate

[0037] Mix large particles of cobalt tetroxide and small particles of cobalt tetroxide at a ratio of 8:2, then add lithium carbonate with a ratio of Li and Co of 1.1:1, mix well, and calcinate at 850°C for 24 hours to prepare lithium cobaltate.

[0038](2) Preparation of lithium niobium oxide / cobalt tetroxide composite coating modified lithium cobalt oxide

[0039] Add 1 mol of lithium cobaltate to 1 L of anhydrous ethanol, and ultrasonically disperse it for 10 min to obtain a 1 mol / L lithium cobalt oxide / alcohol solution; then add 0.01 mol of niobium ethoxide and 0.012 mol of lithium ethoxide, and in N 2 Stir and reflux under protection for 20 hours to obtain lithium cobalt oxide coated with bimetallic organics, and then dropwise add 10 ml of deionized water for hydrolysis, and stir and heat the hydrolyzed gel until the solvent is completely volatilized to obtain lithium niobate-coated cobalt acid. The lithium material was finall...

Embodiment 2

[0050] The difference from Example 1 is: the preparation of lithium niobium oxide / cobalt tetroxide composite coating modified lithium cobaltate: the amount of niobium ethoxide added is 0.03 mol, and the added amount of lithium ethoxide is 0.036 mol.

[0051] The rest are the same as those in Embodiment 1, and are not repeated here.

Embodiment 3

[0053] The difference from Example 1 is: the preparation of lithium niobium oxide / cobalt tetroxide composite coating modified lithium cobalt oxide: the addition amount of niobium ethoxide is 0.05mol, and the addition amount of lithium ethoxide is 0.06mol.

[0054] The rest are the same as those in Embodiment 1, and are not repeated here.

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Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a lithium cobalt oxide material and a preparation method thereof, a positive plate and a lithium ion battery, the lithium cobalt oxide material comprises a lithium cobalt oxide core and a coating layer coating the outer surface of the lithium cobalt oxide core, and the coating layer comprises lithium niobium oxide and cobaltosic oxide. According to the lithium cobalt oxide material disclosed by the invention, a coating layer with good uniformity is formed on the surface of lithium cobalt oxide in situ by utilizing a high-temperature solid-phase reaction, the coating layer with a compact and stable structure is provided, the coating uniformity is good, the ionic conductivity is good, and the rate and the cycle performance of a positive electrode material are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a lithium cobalt oxide material, a preparation method thereof, a positive electrode sheet, and a lithium ion battery. Background technique [0002] In recent years, with the rapid development of energy storage equipment, electric vehicles, mobile communication terminals, etc., the energy density and cycle performance of lithium-ion batteries are increasingly demanding. Lithium cobaltate is currently one of the most promising cathode materials for lithium-ion batteries due to its high energy density, long cycle life, and high compaction density. [0003] With the increase of the application voltage system of lithium cobaltate, the proportion of lithium cobaltate that can deintercalate lithium ions is getting higher and higher, and the advantages of ED are becoming more and more obvious. However, the instability of the crystal structure of the material under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 祝子倩杨志武王飞雪陈杰杨山其他发明人请求不公开姓名
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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