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Lithium battery composite positive electrode material and preparation method thereof, and lithium battery positive electrode

A technology of composite positive electrode material and positive electrode material is applied in the field of lithium battery positive electrode, lithium battery composite positive electrode material and its preparation, and can solve problems such as capacity decrease.

Inactive Publication Date: 2018-04-06
TSINGHUA INNOVATION CENT IN DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, atomic layer deposition technology has been widely used in the surface coating of lithium-ion battery cathode materials, which can protect the cathode materials well at the nanometer scale. However, the atomic layer coating technology reported before is mostly limited to the deposition of alumina using general formulas. Al 2 o 3 and other materials
The compactness of atomic layer deposition requires that the coating material has ideal conductivity and lithium conductivity, otherwise it will completely block the migration of electrons and ions, so although the stability of the positive electrode material is significantly improved, the capacity will be significantly reduced

Method used

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  • Lithium battery composite positive electrode material and preparation method thereof, and lithium battery positive electrode
  • Lithium battery composite positive electrode material and preparation method thereof, and lithium battery positive electrode

Examples

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Embodiment 1

[0022] Lithium battery composite positive electrode material, its preparation method is: a, the positive electrode material particle is placed in the processing chamber of ALD system, and processing chamber is evacuated to the pressure in the range of 0.3 to 0.5mbar during the deposition process, and positive electrode The material particles are kept at a temperature of 100-200°C during the deposition process; b, pulse with deionized water for 0.3S, and carry out the adsorption reaction for 60S, c, then purge excess water with inert gas, d, use three (2 , 2,6,6-tetramethyl-3,5-heptanedione) lanthanum pulse 5S, adsorption reaction 60S, e, purge excess tris(2,2,6,6-tetramethyl- 3,5-heptanedione) lanthanum; f, steps b, c, d, and e are a thermal atomic layer deposition (ALD) cycle, and steps b, c, d, and e are repeated in sequence to realize dilanthanum trioxide in the positive electrode particles The surface of the material grows layer by layer with a thickness of about 10 nm; g,...

Embodiment 2

[0024] Lithium battery composite positive electrode material, its preparation method is: a, the positive electrode material particle is placed in the processing chamber of ALD system, and processing chamber is evacuated to the pressure in the range of 0.3 to 0.5mbar during the deposition process, and positive electrode The material particles are kept at a temperature of 100-200°C during the deposition process; b, pulse with deionized water for 0.5S, and carry out the adsorption reaction for 50S, c, then purge excess water with inert gas, d, use three (2 , 2,6,6-tetramethyl-3,5-heptanedione) lanthanum pulse 5S, adsorption reaction 70S, e, purge excess tris(2,2,6,6-tetramethyl- 3,5-heptanedione) lanthanum; f, steps b, c, d, and e are a thermal atomic layer deposition (ALD) cycle, and steps b, c, d, and e are repeated in sequence to realize dilanthanum trioxide in the positive electrode particles The layer-by-layer growth thickness of the material surface is about 15nm; g, pulse ...

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Abstract

The invention provides a lithium battery composite positive electrode material comprising positive electrode material particles using as central cores, wherein the central cores are covered with lanthanum trioxide coating layers, the lanthanum trioxide coating layers are coated with cerium oxide coating layers, and diameters of the central cores are 10nm-10microns. An atomic layer deposition method is used for depositing metallic oxide on carbon powder with high specific surface area, and the mass ratio of the thin metallic oxide to the carbon with high specific surface area is 70%-90%. The invention simultaneously provides a method of preparing the high specific surface area carbon / metallic oxide composite electrode material by using the atomic layer deposition method. The high specific surface area carbon / metallic oxide composite electrode material provided by the invention has the characteristic of high mass ratio, and the lithium ion battery prepared by the electrode material has high cycle life and high capacity stability.

Description

technical field [0001] The invention relates to the technical field of lithium battery new materials, in particular to a lithium battery composite positive electrode material, a preparation method thereof, and a lithium battery positive electrode. Background technique [0002] Driven by the need for increased energy density in areas such as consumer electronics, electric vehicles, and even power grids, modern Li-ion batteries are typically designed to operate over a wide electrochemical window to achieve maximum energy density. Although exceeding the limit of the cut-off potential can enable the battery to provide higher energy density while increasing the specific capacity and higher output voltage, it also makes the battery face greater challenges in terms of thermodynamic and kinetic stability. Especially for layered lithium transition metal oxides, with a wider electrochemical window, although the capacity can be improved, the stability is decreased. In the field of mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 江莹冰杨世峰高勇谦
Owner TSINGHUA INNOVATION CENT IN DONGGUAN
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