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Preparation method for lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material

A technology of nickel cobalt lithium aluminate and lithium metatitanate, which is applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of irreversible capacity loss of materials, side reactions of electrolytes, and changes in material structure, so as to reduce the Moisture Sensitivity, Reduced Direct Contact, Improved Safety Effectiveness

Inactive Publication Date: 2017-06-30
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are still some problems in the use of NCA materials, mainly in the following two points: (1) During the charging process, due to the Ni 2+ and Li + The radii of are very close, partly Ni 2+ will occupy Li + vacancies, ion mixing occurs, resulting in irreversible capacity loss of the material; (2) Ni in the material is in a high oxidation state (Ni 3+ or Ni 4+ ) has a strong instability, the structure of the material will change at high temperature, and it is easy to have a side reaction with the electrolyte, resulting in capacity attenuation

Method used

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  • Preparation method for lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material
  • Preparation method for lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material

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Embodiment 1

[0025] Add 0.1g of titanium dioxide into the coating device, and at the same time, add 20g of LiNi 0.8 co 0.15 Al 0.05 o 2 Put it into the coating device, ball mill the mixture for 1 h at room temperature, and pass the sample through a 400-mesh sieve to obtain a solid powder; put the solid powder into a muffle furnace, and heat it up to 600 °C in an air atmosphere at a rate of 5 °C / min. hour, cooled naturally to room temperature, and the prepared sample was passed through a 400-mesh sieve to obtain nickel-cobalt-aluminum lithium coated with lithium metatitanate.

Embodiment 2

[0027] Add 0.1g of titanium dioxide into the coating device, and at the same time, add 20g of LiNi 0.8 co 0.15 Al 0.05 o 2 Put it into the coating device, ball mill the mixture for 1 h at room temperature, and pass the sample through a 400-mesh sieve to obtain a solid powder; put the solid powder into a muffle furnace, heat up to 700 °C at a heating rate of 5 °C / min in an air atmosphere and roast for 3 hour, cooled naturally to room temperature, and the prepared sample was passed through a 400-mesh sieve to obtain nickel-cobalt-aluminum lithium coated with lithium metatitanate.

Embodiment 3

[0029] Add 0.1g of titanium dioxide into the coating device, and at the same time, add 20g of LiNi 0.8 co 0.15 Al 0.05 o 2 Put it into the coating device, ball mill the mixture for 1 h at room temperature, and pass the sample through a 400-mesh sieve to obtain a solid powder; put the solid powder into a muffle furnace, heat up to 300 °C at a heating rate of 5 °C / min in an air atmosphere and roast for 8 hour, cooled naturally to room temperature, and the prepared sample was passed through a 400-mesh sieve to obtain nickel-cobalt-aluminum lithium coated with lithium metatitanate.

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Abstract

The invention especially discloses a preparation method for a lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material, belonging to the field of positive electrode materials of lithium ion batteries. The preparation method for the lithium metatitanate-coated nickel-cobalt-lithium aluminate positive electrode material is characterized by comprising the following steps: adding titanium dioxide and nickel-cobalt-lithium aluminate powder into a coating device and carrying out sufficient dispersion, adsorption and recombination so as to obtain solid powder; and putting the solid powder into a muffle furnace, carrying out heating, roasting the solid powder in an air atmosphere and then carrying out natural cooling to room temperature so as to obtain lithium metatitanate-coated nickel-cobalt-lithium aluminate. According to the invention, lithium metatitanate is used for surface coating and used as a conductor material for Li<+>, so intercalation and deintercalation of Li<+> can be better realized, and the cycle performance and rate performance of the material are improved; and through coating with lithium metatitanate, humidity sensitivity of NCA is reduced, direct contact between the electrode material and an organic electrolyte is decreased, so the structural stability of NCA is further improved and security of the material is enhanced.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a preparation method for lithium metatitanate-coated nickel-cobalt lithium aluminate positive electrode materials. [0003] (2) Background technology [0004] In recent years, with the continuous advancement of science and technology and the continuous upgrading of power systems used in civilian and military fields, people have also put forward higher requirements for lithium-ion batteries. In particular, the demand for lithium-ion batteries with large capacity, high specific energy, and long life is very urgent, and at the same time, the requirements for the environment in which the products are used are becoming more and more stringent. The mainstream lithium-ion battery cathode materials mainly include LiCoO 2 、LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 , LiMn 2 o 4 、LiFePO 4 , LiNiO 2 , where the battery volume is limited, use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 彭慧丽宋春华王瑛赵成龙王文阁段丹丹张恩建
Owner SHANDONG YUHUANG NEW ENERGY TECH
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