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Preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as high cost, high consumption, and environmental protection pressure, and achieve regular shape, complete crystal form, and high specific capacity. Effect

Active Publication Date: 2013-04-24
GUANGZHOU LIBODE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also needs to consume a large amount of alkali and oxidant, which has high cost and great pressure on environmental protection.

Method used

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  • Preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries
  • Preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries
  • Preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The nickel cobalt aluminum hydroxide precursor (Ni 0.8 co 0.15 Al 0.05 )(OH) 2 Pre-fired at 600°C for 5 hours in a pure oxygen atmosphere furnace with 2 atmospheric pressures, and obtained the oxidized precursor material after cooling; then mixed lithium hydroxide and the oxidized precursor evenly, and then placed in a flowing oxygen atmosphere furnace at 700°C Calcined for 15 hours, crushed and graded after cooling to obtain LiNi 0.8 co 0.15 Al 0.05 o 2 Material. Among them, nickel cobalt aluminum hydroxide precursor (Ni 0.8 co 0.15 Al 0.05 )(OH) 2 For commercial sale. The LiNi 0.8 co 0.15 Al 0.05 o 2 The tap density of the material is 2.22g / cm 3 , with an average particle size of 9.916 μm. Its scanning electron microscope picture is as figure 1 As shown, the morphology is spherical and spherical; its X-ray diffraction pattern is shown in figure 2 As shown, it is consistent with the JCPDS standard card 87-1562; assembled into an experimental half-ce...

Embodiment 2

[0032] The nickel-cobalt-aluminum carbonate precursor (Ni 0.8 co 0.15 Al 0.05 )CO 3 Place in an oxygen atmosphere furnace with 4 atmospheric pressure at 650°C for 10 hours, after cooling, mix lithium carbonate and oxidation precursor evenly, then place it in a flowing oxygen atmosphere furnace and bake at 750°C for 24 hours, after cooling, break and classify, get LiNi 0.8 co 0.15 Al 0.05 o 2 Material. Among them, nickel-cobalt-aluminum carbonate precursor (Ni 0.8 co 0.15 Al 0.05 )CO 3 For commercial sale.

[0033] After inspection, the LiNi 0.8 co 0.15 Al 0.05 o 2 The tap density of the material is 2.05g / cm 3 , with an average particle size of 9.481 μm; assembled into an experimental half-cell, charged and discharged at 0.2C between 2.8-4.3V, the initial capacity was 192.8mAh / g, the first charge-discharge efficiency was 83.8%, and the capacity retention rate after 300 cycles was 81.2%.

Embodiment 3

[0035] The nickel cobalt aluminum oxalate precursor (Ni 0.7 co 0.2 Al 0.1 )C 2 o 4 2H 2 O is pre-fired at 600°C for 12 hours in an oxygen atmosphere furnace with 8 atmospheric pressures. After cooling, mix lithium carbonate and the oxidation precursor evenly, and then place it in a flowing oxygen atmosphere furnace and bake at 650°C for 24 hours. After cooling, it is broken and classified , to get LiNi 0.8 co 0.15 Al 0.05 o 2 Material. Among them, nickel cobalt aluminum oxalate precursor (Ni 0.7 co 0.2 Al 0.1 )C 2 o 4 2H 2 O is commercially available.

[0036] After inspection, the LiNi 0.7 co 0.2 Al 0.1 o 2 The tap density of the material is 1.87g / cm 3 , the average particle size is 7.273μm; assembled into an experimental half-cell, charged and discharged at 0.2C between 2.8-4.3V, the initial capacity is 178.3mAh / g, the first charge-discharge efficiency is 85.2%, and the capacity retention rate after 100 cycles is 83.8%.

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Abstract

The invention provides a preparation method of lithium-nickel-cobalt-aluminum oxide for anode materials of lithium ion batteries. The method comprises: step 1, using a nickel-cobalt-aluminum precursor prepared through a coprecipitation method and doped with mixed ions as raw materials, putting the raw materials into a sealed hearth of a pressure furnace, continuously introducing oxygen until a fixed pressure value is formed, then heating to a pre-burning temperature and keeping warm for a period of time, and cooling to obtain an oxidized precursor; and step 2, adding measured lithium salt or lithium hydroxide into the oxidized precursor, ball milling and uniformly mixing; heating the uniformly mixed raw materials to a certain temperature and keeping warm for a period of time, and meanwhile continuously introducing oxygen to complete a sintering process, thereby obtaining the finish product. According to the invention, through a hyperbaric oxygen atmosphere, the oxygen are enabled to fully infiltrate into particles of the raw materials which has a certain accumulation thickness, thereby preventing situations that only surface materials are oxidized under a normal pressure, and ensuring a full conversion of Ni<2+> to Ni<3+> by a full pre-oxidation.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular provides a method for preparing lithium nickel cobalt aluminum oxide lithium ion positive electrode materials by using a precursor pre-oxidation method. Background technique [0002] As a green secondary battery, lithium-ion batteries have the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect. They have been widely used in mobile electronic appliances such as mobile phones, cameras, and notebook computers. , At the same time, it is increasingly used in artificial satellites, aerospace, electric vehicles and other fields. As a solid solution of LiNiO2 and LiCoO2, LiNixCo1-xO2 (0.7≤x≤0.9) cathode material has the advantages of both: high discharge specific capacity, good cycle performance, low cost, and less environmental pollution. However, this mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/12Y02E60/10
Inventor 胡国荣杜柯吴层陈瑞祥袁昌杰杨寿平周显茂伍斌
Owner GUANGZHOU LIBODE NEW MATERIAL
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