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Aluminium and erbium coated high-nickel lithium-ion cathode material and preparation method thereof

A cathode material and lithium ion technology, applied in the field of aluminum and erbium coated high-nickel lithium ion cathode materials and their preparation fields, can solve problems such as uniform coating of metal ions, improve cycle performance at room temperature and high temperature, reduce physical and chemical properties, The effect of reducing process steps

Active Publication Date: 2018-01-19
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide an aluminum, erbium-coated high-nickel lithium ion positive electrode material and its preparation method, aiming to solve the technical problem that existing methods cannot realize the uniform coating of some metal ions on the surface of the positive electrode material

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  • Aluminium and erbium coated high-nickel lithium-ion cathode material and preparation method thereof
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preparation example Construction

[0024] Such as figure 1 As shown, the preparation method of aluminum, erbium coated high-nickel lithium ion cathode material provided by the invention comprises the following steps:

[0025] Step S1, preparing aluminum and erbium coating solution.

[0026] Specifically, when preparing the aluminum coating solution, the aluminum compound is dissolved in ultrapure water, heated to 45-80° C., and stirred until it is completely dissolved. When preparing the erbium coating solution, dissolve the erbium oxide in the organic acid, heat to 80-100° C., and stir until it is completely dissolved, and the time is 5-12 hours.

[0027] The aluminum compound mentioned here can be aluminum lactate, wherein the added amount of aluminum is 0.1-0.5% of the lithium ion positive electrode material. The erbium oxide is Er 2 o 3 , the organic acid is acetic acid, Er:organic acid=1:3~1:10mol%.

[0028] Step S2, disperse the lithium ion positive electrode material in water, adjust the pH to be al...

Embodiment 1

[0035] (1) First prepare the aluminum coating solution, dissolve 100.9g of aluminum lactate in 500ml of ultrapure water, heat to 60°C, and stir until it is completely dissolved. Next prepare the erbium coating liquid, 23.7gEr 2 o 3 Dissolve in 22.3g of acetic acid, heat to 90°C, and stir until it is completely dissolved for 7 hours. The coating amount of aluminum was 1000 ppm, and the coating amount of erbium was 2000 ppm.

[0036] (2) 10kg LiNi 0.8 co 0.15 mn 0.15 o 2 Put the cathode material into 20kg of ultrapure water, adjust the pH value between 9.5 and 12.5, turn on the stirring paddle, and set the temperature at 45°C. While stirring, first add the erbium coating solution, and finish adding within 5 minutes. Monitor the pH to ensure that the pH is between 8 and 11, then add the aluminum coating solution and continue stirring for 30 minutes.

[0037] (3) Suction filter the above suspension, and dry the filter cake in a vacuum oven at 120° C. for 10 hours. The drie...

Embodiment 2

[0040] (1) First prepare the aluminum coating solution, dissolve 100.9g of aluminum lactate in 300ml of ultrapure water, heat to 60°C, and stir until it is completely dissolved. Next prepare the erbium coating liquid, 47.4gEr 2 o 3Dissolve in 66.9g of acetic acid, heat to 80°C, and stir until it is completely dissolved for 5 hours. The coating amount of aluminum was 1000 ppm, and the coating amount of erbium was 4000 ppm.

[0041] (2) 10kg LiNi 0.88 co 0.09 al 0.03 o 2 Put the cathode material into 20kg of ultrapure water, adjust the pH value between 9.5 and 12.5, turn on the stirring paddle, and set the temperature at 50°C. While stirring, first add the erbium coating solution, and finish adding within 5 minutes. Monitor the pH to ensure that the pH is between 8 and 11, then add the aluminum coating solution and continue stirring for 20 minutes.

[0042] (3) Suction filter the above suspension, and dry the filter cake in a vacuum oven at 100° C. for 10 hours. The drie...

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Abstract

The invention is applicable to the technical field of a lithium battery, and provides an aluminium and erbium coated high-nickel lithium-ion cathode material and a preparation method thereof. The method comprises the steps of: preparing aluminium and erbium coating liquid; dispersing a lithium-ion cathode material into water, regulating pH into an alkaline state, in a stirring state, firstly adding erbium coating liquid and then adding the aluminium coating liquid, and continuously stirring to obtain suspension; and filtering the suspension, and drying, roasting and sieving precipitates to obtain the aluminium and erbium coated lithium-ion cathode material. According to the method provided by the invention, metal aluminium and erbium ions can be well dissolved in solution and are uniformlycoated on the surface of the cathode material so as to fulfill the aim of integrating washing with coating. Residual alkali of the high-nickel lithium-ion cathode material is efficiently reduced in the aspect of physical and chemical performance, reaction of the cathode material and electrolyte is inhibited, normal temperature and high temperature cycle performance of the high-nickel cathode material are improved, and flatulence is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to an aluminum and erbium-coated high-nickel lithium ion positive electrode material and a preparation method thereof. Background technique [0002] Since the domestic new energy vehicle subsidy policy is linked to energy density, and the current mainstream battery cathode materials are ternary materials, high-nickel lithium-ion cathode materials are favored. The successful application of 18650 batteries made of NCA in Tesla vehicles has accelerated the research and development of high-nickel cathode materials in China. However, due to the material instability brought about by the increase of Ni, a new challenge has been added. In order to solve this problem, surface modification of high-nickel lithium-ion cathode materials must be carried out. [0003] Regular Al 2 o 3 , AlF 3 , Li 2 MnO 3 , Li 2 ZrO 3 Although such coating can achieve certain results, there are s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 徐世国张文艳许国干李伟张玉军刘钰
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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