Coated lithium ion battery positive electrode material as well as preparation method and application thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improving specific capacity and rate performance, improving electronic conductance and ion conductance, and prolonging cycle life

Pending Publication Date: 2022-03-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned technical scheme reports the coating modification of positive electrode materials, but there is still room for improvement in the way of coating and the selection of coating materials. How to obtain more uniform coating and select suitable coating materials is an urgent need in this field. Technical issues resolved

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  • Coated lithium ion battery positive electrode material as well as preparation method and application thereof
  • Coated lithium ion battery positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example provides a coated lithium ion battery positive electrode material including a lithium oxide core and a coating layer covering the lithium oxide core; the lithium oxide The kernel is lithium nickel-watery (NCM811) with an average particle diameter of 5 μm; the cladding layer is a molar ratio of 1: 1: 1 4 Ti 5 O 12 , TIO 2 Ti 4 O 7 Combination; the mass ratio of the coating layer and the lithium oxide core is 0.05: 1.

[0042] The preparation method of the coated lithium ion battery positive electrode material includes the steps of:

[0043] Under the argon atmosphere, the nucleation is a substrate with a lithium oxide core, and the water and t-butanol are lithium tetrabutyl, and the ratio of atomic layer is performed during the surface of the substrate, and the ratio of LI, Ti and O is controlled. LI in the coating layer 4 Ti 5 O 12 , TIO 2 Ti 4 O 7 The molar ratio is 1: 1: 1 to obtain the coated lithium ion battery positive electrode material.

Embodiment 2

[0045] This example provides a coated lithium ion battery positive electrode material including a lithium oxide core and a coating layer covering the lithium oxide core; the lithium oxide The kernel is lithium nickel-watery (NCM811) with an average particle diameter of 3 μm; the cladding layer is a molar ratio of 0.8: 0.5: 1. 4 Ti 5 O 12 , TIO 2 Ti 4 O 7 Combination; the mass ratio of the coating layer and the lithium oxide core is 0.06: 1.

[0046] The preparation method of the coated lithium ion battery positive electrode material includes the steps of:

[0047] Under a nitrogen atmosphere, a lithium oxide core is a substrate, and the ratio of the atomic layer deposition in the surface of the base is performed by tetrachloride, water and lithium acetate, and the ratio of LI, Ti and O is controlled in the coating layer. 4 Ti 5 O 12 , TIO 2 Ti 4 O 7 The molar ratio was 0.8: 0.5: 1 to obtain the coated lithium ion battery positive material.

Embodiment 3

[0049] This example provides a coated lithium ion battery positive electrode material including a lithium oxide core and a coating layer covering the lithium oxide core; the lithium oxide The core is lithium nickel-watery (NCM811) with an average particle diameter of 5 μm; the cladding layer is a molar ratio 1: 0.8: 1.1 li 4 Ti 5 O 12 , TIO 2 Ti 4 O 7 Combination; the mass ratio of the coating layer and the lithium oxide core is 0.08: 1.

[0050] The preparation method of the coated lithium ion battery positive electrode material includes the steps of:

[0051] Under the conditions of argon atmosphere, the core is a substrate with a lithium oxide, and the water and lithium hydroxide are used, and the ratio of the atomic layer is performed during the surface of the substrate. The proportion of Li, Ti and O LI in the coating 4 Ti 5 O 12 , TIO 2 Ti 4 O 7 The molar ratio was 1: 0.8: 1.1 to obtain the coated lithium ion battery positive electrode material.

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Abstract

The invention provides a coated lithium ion battery positive electrode material as well as a preparation method and application thereof. The coated lithium ion battery positive electrode material comprises a lithium oxide core and a coating layer coating the lithium oxide core, the coating layer comprises a combination of Li4Ti5O12, TiO2 (titanium dioxide) and Ti4O7 (titanium dioxide). In the preparation process, a lithium oxide is used as a substrate, and a titanium source, an oxygen source and a lithium source are deposited on the substrate by using a deposition system to obtain the coated lithium ion battery positive electrode material. According to the positive electrode material provided by the invention, the Li4Ti5O12, the TiO2 and the Ti4O7 are coated on the inner core, so that the coating of a high-ionic-conductivity and high-electron-conductivity material is realized, the overall structural stability of the material can be improved, the reversible specific capacity and the cycling stability of the material are further improved, and the positive electrode material has a good application prospect.

Description

Technical field [0001] The present invention belongs to the technical field of the battery material, and it is directed to a lithium ion battery positive electrode material, and more particularly to a positive material material of a coated lithium ion battery and a preparation method thereof. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered the rapid development stage. Key materials affecting the performance of lithium ion battery mainly have a positive electrode material, an anode material, an electrolyte, and the like. Among them, the positive material material is currently limited to battery performance, and its performance also accounts for nearly 40% of the cost of lithium ion battery. [0003] At present, the positive electrode material comprises lithium cobaltate, lithium nickel cobalt-amylate, lithium nickellate, lithium manganese acid or lithium iron phosphate, but the above materials have re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCH01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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