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Method for preparing lithium nickel cobalt aluminum oxides serving as lithium ion battery positive electrode material

A lithium-nickel-cobalt-aluminum-oxygen, lithium-ion battery technology, which is applied in the fields of energy storage materials and electrochemistry, can solve the problems of low reversible capacity of positive electrode materials, difficult to precipitate large spherical particles, and difficult to filter flocculent precipitates, so as to protect cobalt resources. , The effect of reducing the cost of raw materials and improving the volumetric energy density

Inactive Publication Date: 2011-09-07
GUOGUANG ELECTRIC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this liquid phase oxidation method also has some disadvantages. For example, when trivalent ions are precipitated, it is easy to form flocculent precipitates, which is difficult to filter, and it is also difficult to form spherical large particle precipitates. In addition, a large amount of oxidant is required, which increases the cost.
When using the existing method to prepare lithium nickel cobalt aluminum oxygen cathode material, there are disadvantages such as low reversible capacity and poor cycle stability of the cathode material.

Method used

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  • Method for preparing lithium nickel cobalt aluminum oxides serving as lithium ion battery positive electrode material
  • Method for preparing lithium nickel cobalt aluminum oxides serving as lithium ion battery positive electrode material
  • Method for preparing lithium nickel cobalt aluminum oxides serving as lithium ion battery positive electrode material

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Effect test

Embodiment 1

[0044] (1) Using nickel sulfate, cobalt sulfate, and aluminum sulfate as raw materials, according to Ni: Co: Al molar ratio 0.70: 0.25: 0.05, prepare spherical nickel-cobalt-aluminum composite hydroxide precursor by co-precipitation method;

[0045] (2) Put the nickel-cobalt-aluminum composite hydroxide precursor in a resistance furnace, raise the temperature to 300°C at a rate of 8°C / min, keep it warm for 1 hour, and pre-oxidize in an oxygen atmosphere to obtain a nickel-cobalt-aluminum composite oxide Li m Ni 1-x-y co x Al y o 2 , x=0.25, y=0.05, m=1.0;

[0046] (3) Mix the composite oxide of nickel-cobalt-aluminum and lithium hydroxide according to the atomic ratio n Li:(n Ni +n Co +n Al ) = 1.10: 0.80 mixed in a ratio of 1.10: 0.80, using ethanol as the ball milling medium, ball milling for 3 hours evenly, after drying, place it in a resistance furnace, slowly heat up to 600°C in an oxygen atmosphere, keep the temperature for 10 hours, cool naturally, crush, classi...

Embodiment 2

[0048] (1) Using nickel sulfate, cobalt sulfate, and aluminum sulfate as raw materials, according to Ni: Co: Al molar ratio 0.73: 0.25: 0.02, prepare spherical nickel-cobalt-aluminum composite hydroxide precursor by co-precipitation method;

[0049] (2) Put the composite hydroxide precursor of nickel-cobalt-aluminum in a resistance furnace, raise the temperature to 350°C at a rate of 8.5°C / min, keep it warm for 2 hours, and pre-oxidize in an oxygen atmosphere to obtain a composite oxide of nickel-cobalt-aluminum Li m Ni 1-x-y co x al y o 2 , x=0.25, y=0.02, m=1.0;

[0050] (3) Mix the composite oxide of nickel-cobalt-aluminum and lithium hydroxide according to the atomic ratio n Li :(n Ni +n Co +n Al ) = 1.10: 0.90 mixed in a ratio of 1.10:0.90, with ethanol as the ball milling medium, ball milled for 3.5 hours to be uniform, dried, placed in a resistance furnace, slowly heated to 620°C in an oxygen atmosphere, kept at a constant temperature for 11 hours, naturally coo...

Embodiment 3

[0052] (1) Using nickel sulfate, cobalt sulfate, and aluminum sulfate as raw materials, according to Ni: Co: Al molar ratio 0.75: 0.20: 0.05, prepare spherical nickel-cobalt-aluminum composite hydroxide precursor by co-precipitation method;

[0053] (2) Put the nickel-cobalt-aluminum composite hydroxide precursor in a resistance furnace, raise the temperature to 400°C at a rate of 9°C / min, keep it warm for 3 hours, and pre-oxidize in an oxygen atmosphere to obtain a nickel-cobalt-aluminum composite oxide Li m Ni 1-x-y co x al y o 2 , x=0.20, y=0.05, m=0.98;

[0054] (3) Mix the composite oxide of nickel-cobalt-aluminum and lithium hydroxide according to the atomic ratio n Li :(n Ni +n Co +n Al ) = 1.15: 0.95, mixed in a ratio of 1.15:0.95, using ethanol as the ball milling medium, milled for 3.5 hours evenly, dried, placed in a resistance furnace, slowly heated up to 650°C in an oxygen atmosphere, kept at a constant temperature for 15 hours, cooled naturally, crushed, ...

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Abstract

The invention relates to a method for preparing lithium nickel cobalt aluminum oxides serving as a high-capacity lithium ion battery positive electrode material, which comprises the following steps of: performing preoxidation roasting on nickel cobalt composite hydroxides or nickel cobalt composite carbonates by taking spherical nickel cobalt aluminum composite hydroxides or spherical nickel cobalt aluminum composite carbonates prepared by a coprecipitation method as a raw material to obtain uniform solid solution of high-valence state spherical nickel cobalt oxides in advance, so that all element are mixed in a molecular level; and mixing the preoxidized high-valence state nickel cobalt oxides and lithium salt uniformly, roasting at a high temperature under the atmosphere of oxygen, and cooling and crushing to obtain the lithium nickel cobalt aluminum oxide positive electrode material with a spherical structure. The prepared lithium nickel cobalt aluminum oxide positive electrode material has uniform granular distribution, discharging specific capacity of more than 185 mAh / g(4.3V vs Li), high circulating performance, a simple preparation process and low cost.

Description

technical field [0001] The invention relates to the fields of energy storage materials and electrochemistry, in particular to a preparation method of lithium-nickel-cobalt-aluminum-oxygen, a cathode material of a lithium-ion battery. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have the advantages of high energy density and high discharge platform, and have been widely used in digital products such as mobile phones, digital cameras, and notebook computers. With the development of lithium-ion battery technology, lithium-ion batteries are required to have the characteristics of high power, high energy density, and low cost. Lithium-ion battery cathode material is an important part of lithium-ion batteries and the main factor affecting the performance of lithium-ion batteries. At present, the cathode materials for commercial application mainly include LiCoO2, LiMn2O4 and LiFePO4, and LiCoO2 occupies most of the market....

Claims

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Application Information

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IPC IPC(8): C01G53/04C01G51/04H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈瑞祥胡国荣彭忠东杜柯伍斌曹雁冰
Owner GUOGUANG ELECTRIC
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