Preparation method and application of metal-doped spinel structure fast ion conductor coated nickel-containing positive electrode material

A technology of spinel structure and metal doping, applied in the preparation of lithium-ion batteries, preparation of metal-doped spinel structure fast ion conductors coated with nickel-containing positive electrode materials, field of modified lithium-ion battery positive electrode materials , can solve the problems of high cost, complex operation of fast ion conductors, and difficulty in industrial production, and achieve the effect of preventing dissolution loss, facilitating large-scale industrial production, and low cost

Active Publication Date: 2018-09-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional coating method, the preparation process of fast ion conductors has the disadvantages of complicated operation and high cost, and it is difficult to realize large-scale industrial production

Method used

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  • Preparation method and application of metal-doped spinel structure fast ion conductor coated nickel-containing positive electrode material
  • Preparation method and application of metal-doped spinel structure fast ion conductor coated nickel-containing positive electrode material
  • Preparation method and application of metal-doped spinel structure fast ion conductor coated nickel-containing positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) According to LiAl 0.1 Ti 1.9 O 4 The coating mass percentage of the fast ion conductor relative to the positive electrode material is 0.5%. A quantitative amount of titanium isopropoxide is fully dispersed in anhydrous ethanol for 0.5 h using a mechanical stirring method or an ultrasonic method.

[0038] (2) The titanium isopropoxide dispersion in step (1) is heated in a water bath at 80°C, and the layered LiNi 0.8 Co 0.1 Mn 0.1 O 2 The positive electrode material was added to the titanium isopropoxide dispersion, and stirred and dispersed for 0.5 h.

[0039] (3) Dissolve the aluminum-containing metal salt in deionized water according to 1.4% of the atomic percentage of the doped metal element in the fast ion conductor, and add it to the titanium isopropoxide dispersion in step (2), and Continue stirring for 1.0h.

[0040] (4) Add the mixture obtained in step (3) to the reaction kettle, keep it at 80°C for 24h in a blast drying box, cool to room temperature naturally, wash...

Embodiment 2

[0048] (1) According to LiCe 0.05 Ti 1.95 O 4 The coating mass percentage of the fast ion conductor relative to the positive electrode material is 1.5%. A quantitative amount of titanium isopropoxide is fully dispersed in anhydrous ethanol for 0.2h by mechanical stirring method or ultrasonic method.

[0049] (2) The titanium isopropoxide dispersion in step (1) is heated in a water bath at 50°C, and the layered LiNi 0.85 Co 0.05 Mn 0.1 O 2 The positive electrode material was added to the titanium isopropoxide dispersion, and stirred and dispersed for 0.8 h.

[0050] (3) The cerium-containing metal salt is dissolved in deionized water according to 0.7% of the atomic percentage of the fast ion conductor occupied by the doped metal element, and added to the titanium isopropoxide dispersion in step (2), and Continue to stir for 1.5h.

[0051] (4) Add the mixture obtained in step (3) to the reaction kettle, keep it at 120°C for 48h in a blast drying box, cool it naturally to room temperatu...

Embodiment 3

[0056] (1) According to LiV 0.15 Ti 1.85 O 4 The coating mass percentage of the fast ion conductor relative to the positive electrode material is 2.0%. A quantitative amount of titanium isopropoxide is fully dispersed in absolute ethanol for 1.5 hours by mechanical stirring method or ultrasonic method.

[0057] (2) The titanium isopropoxide dispersion in step (1) is heated in a water bath at 50°C, and the layered LiNi 0.5 Co 0.2 Mn 0.3 O 2 The positive electrode material was added to the titanium isopropoxide dispersion, and stirred and dispersed for 4.0 h.

[0058] (3) The vanadium-containing metal salt is dissolved in deionized water according to 2.0% of the atomic percentage of the fast ion conductor occupied by the doped metal element, and added to the titanium isopropoxide dispersion in step (2), and Continue stirring for 1.0h.

[0059] (4) Add the mixture obtained in step (3) to the reaction kettle, keep it at 140°C for 36 hours in a blast drying box, cool it naturally to room ...

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Abstract

The invention discloses a preparation method and application of a metal doped spinel structured and fast ionic conductor coated nickel-containing cathode material. The preparation method comprises the following steps of: dissolving and mixing organic titanium salt, a nickel-containing cathode material and doped metal salt so as to obtain dispersion liquid; transferring the dispersion liquid into a hydrothermal reaction kettle to perform hydrothermal reaction, such that a precursor is obtained; and roasting the precursor at high temperature so as to obtain the nickel-containing cathode material of a metal doped spinel structured and fast ionic conductor coated layer, which is dense, uniform and good in stability and ionic conductivity. The nickel-containing cathode material can be used for preparing a lithium ion battery having excellent cycle performance and rate capability; and the preparation method of the cathode material has the characteristics of being low in cost, simple to operate, environment-friendly and the like, and can be applied to industrial production.

Description

Technical field [0001] The invention relates to a modified lithium ion battery positive electrode material, in particular to a method for preparing a nickel-containing positive electrode material coated with a metal-doped spinel structure fast ion conductor and its application in the preparation of a lithium ion battery, belonging to lithium ion Battery field. Background technique [0002] Nowadays, the rapid development of mobile electronic devices, such as smart phones, digital cameras, notebook computers, as well as electric vehicles and hybrid vehicles, has promoted the rapid development of lithium ion secondary battery technology. However, current cathode materials for lithium-ion batteries, such as lithium cobalt oxide, spinel lithium manganese oxide, and lithium iron phosphate, all have the disadvantage of low cycle life and cannot meet the requirements of future pure electric devices. Therefore, research and development of a positive electrode material with high cycle li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/525H01M4/624H01M10/0525Y02E60/10
Inventor 赖延清张治安徐明张凯李劼
Owner CENT SOUTH UNIV
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