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M-contained multifunctional metal oxide modified high-voltage lithium cobalt oxide positive electrode powder material and preparation method therefor

A powder material, lithium cobalt oxide technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of unfavorable cycle performance, improvement, etc., to achieve the effect of improving discharge specific capacity, increasing volume energy density, and improving crystallization integrity

Active Publication Date: 2016-06-15
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the production technology of lithium cobalt oxide is relatively mature, but there are still many deficiencies to be improved
The lithium cobalt oxide prepared by this method is mainly to change the particle morphology through high lithium ratio to obtain high compaction density, but this method of obtaining high energy density by increasing the lithium ratio is not conducive to the improvement of cycle performance

Method used

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  • M-contained multifunctional metal oxide modified high-voltage lithium cobalt oxide positive electrode powder material and preparation method therefor
  • M-contained multifunctional metal oxide modified high-voltage lithium cobalt oxide positive electrode powder material and preparation method therefor
  • M-contained multifunctional metal oxide modified high-voltage lithium cobalt oxide positive electrode powder material and preparation method therefor

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Embodiment 1

[0041] A high-voltage lithium cobaltate positive electrode powder material modified by a multifunctional metal oxide containing M, the general formula of the positive electrode powder material is: Li 1.01 co 0.985 Al 0.005 Y 0.01 o 2 . The positive electrode powder material has a core-shell structure, and a layer of yttrium-containing aluminum composite oxide (Y 3 Al 5 o 15 ) inert protective layer.

[0042] The preparation method of the above-mentioned high-voltage lithium cobaltate positive electrode powder material in this embodiment includes the following steps:

[0043] With battery-grade cobalt oxide and battery-grade lithium carbonate as raw materials, yttrium oxide (Y 2 o 3 ) as a catalyst, aluminum oxide as an additive, the elemental molar ratio of Li:(Co+Al+Y) is controlled to be 1.01, and the elemental molar ratio of Al:Y:Co is controlled to be 0.005:0.01:0.985, and then placed in a ball mill and mixed uniform; put the above-mentioned homogeneously mixed m...

Embodiment 2

[0048] A high-voltage lithium cobaltate positive electrode powder material modified by the multifunctional metal oxide M of the present invention, the general formula of the positive electrode powder material is: Li 1.05 co 0.99 Al 0.005 Ti 0.005 o 2 . The positive electrode powder material has a core-shell structure, and a layer of titanium oxide (TiO 2 ) inert protective layer.

[0049] The preparation method of the above-mentioned high-voltage lithium cobaltate positive electrode powder material in this embodiment includes the following steps:

[0050] Using battery-grade cobalt oxide and battery-grade lithium carbonate as raw materials, titanium oxide (TiO 2 ) as a catalyst, aluminum oxide is an additive, the elemental molar ratio of controlling Li: Co is about 1.05, and the elemental molar ratio of Al: Ti: Co is controlled to be 0.005: 0.005: 0.990, and then placed in a ball mill and mixed uniformly; The uniform material is put into a bell furnace for sintering tre...

Embodiment 3

[0053] A high-voltage lithium cobaltate positive electrode powder material modified by the multifunctional metal oxide M of the present invention, the general formula of the positive electrode powder material is: Li 1.0 co 0.985 Mg 0.01 Sb 0.005 o 2 . The positive electrode powder material has a core-shell structure, and a layer of antimony oxide (Sb 2 o 3 ) inert protective layer.

[0054] The preparation method of the above-mentioned high-voltage lithium cobaltate positive electrode powder material in this embodiment includes the following steps:

[0055] Using battery-grade cobalt hydroxide (cobalt hydroxy), battery-grade lithium carbonate, and magnesium oxide as raw materials, antimony oxide (Sb 2 o 3 ) as a catalyst, control the molar ratio of Li: (Co+Sb+Mg) to 1.0, and the molar ratio of Mg: Sb: Co to be 0.01: 0.005: 0.985, then place it in a ball mill and mix uniformly; mix the above The uniform material is put into a bell furnace for sintering treatment. The t...

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Abstract

The invention discloses an M-contained multifunctional metal oxide modified high-voltage lithium cobalt oxide positive electrode powder material and a preparation method therefor. The general formula of the positive electrode powder material is LiaCo1-x-yM'xMyO2, and the positive electrode powder material adopts a core-shell structure; the exterior of the inner core of the positive electrode material is coated with an inert protection layer; the inert protection layer at least contains an oxide containing M, or a corresponding composite oxide containing M and M'; the preparation method comprises the steps of mixing a battery-level lithium source, a cobalt source and an additive containing M and M' based on certain proportions; performing constant-temperature sintering on the obtained mixture; and performing powder processing on the obtained sintered product to obtain the high-voltage lithium cobalt oxide positive electrode powder material. The positive electrode powder material prepared in the invention is high in energy density and excellent in cycling performance and safety performance under high voltages.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a metal oxide-modified lithium cobaltate cathode powder material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life. They have not only been widely used in civil and military fields such as mobile phones, notebook computers, video cameras, and digital cameras, but also It has great development prospects in electric vehicles, aerospace and energy storage. [0003] In recent years, with the continuous development of technology and the continuous improvement of the performance of mobile devices and communication devices, higher requirements have been placed on the energy density, cycle life and high temperature performance of lithium-ion batteries. In order to meet people's demand for energy, the development o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 李永昌胡旭尧董虹石慧蒋湘康李旭
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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