Surface-modified lithium-rich layered transition metal oxide as well as preparation method and application thereof

A transition metal and surface modification technology, applied in the direction of active material electrodes, electrochemical generators, electrical components, etc., can solve problems such as difficult to obtain effects, achieve poor intrinsic conductivity, improve cycle stability, and increase conductivity Effect

Active Publication Date: 2020-04-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain better results by surface modification or ion doping alone.

Method used

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  • Surface-modified lithium-rich layered transition metal oxide as well as preparation method and application thereof
  • Surface-modified lithium-rich layered transition metal oxide as well as preparation method and application thereof
  • Surface-modified lithium-rich layered transition metal oxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. The 0.008mol transition metal carbonate (Mn 0.75 Ni 0.25 CO 3 ) Or transition metal hydroxide precursor (Mn 0.75 Ni 0.25 (OH) 2 ) And excess lithium carbonate and molten salt sodium chloride and potassium chloride weighed in molar quantities (the molar ratio of precursor to molten salt is 1:5, and the molar ratio of sodium chloride and potassium chloride is 1:1 ) Mix uniformly, place the mixture in a muffle furnace, heat up to 850°C at a rate of 5°C / min and keep it for 12 hours, then cool to room temperature naturally, after washing, filtering, and drying to obtain the original sample that is lithium-rich Layered transition metal oxide (Li 1.2 Mn 0.6 Ni 0.2 O 2 ).

[0034] 2. Mix the lithium-rich layered transition metal oxide and urea with a molar ratio of 5:1 and place them in a polytetrafluoroethylene reaction vessel filled with an inert atmosphere and seal the reaction vessel. Transfer the reaction vessel to a temperature of 150 It was kept in a blast drying oven at...

Embodiment 2

[0037] 1. The 0.008mol transition metal carbonate (Mn 0.75 Ni 0.25 CO 3 ) Or transition metal hydroxide precursor (Mn 0.75 Ni 0.25 (OH) 2 ) And excess lithium carbonate and molten salt sodium chloride and potassium chloride weighed in molar quantities (the molar ratio of precursor to molten salt is 1:5, and the molar ratio of sodium chloride and potassium chloride is 1:1 ) Mix uniformly, place the mixture in a muffle furnace, heat up to 850°C at a rate of 5°C / min and keep it for 12 hours, then cool to room temperature naturally, after washing, filtering, and drying to obtain the original sample that is lithium-rich Layered transition metal oxide (Li 1.2 Mn 0.6 Ni 0.2 O 2 ).

[0038] 2. At a molar ratio of 5:1, mix the lithium-rich layered transition metal oxide and urea uniformly, and place them in a reaction vessel filled with inert atmosphere of polytetrafluoroethylene and seal the reaction vessel. Transfer the reaction vessel to a temperature of 180°C. In a blast drying oven a...

Embodiment 3

[0042] 1. The 0.008mol transition metal carbonate (Mn 0.75 Ni 0.25 CO 3 ) Or transition metal hydroxide precursor (Mn 0.75 Ni 0.25 (OH) 2 ) And excess lithium carbonate and molten salt sodium chloride and potassium chloride weighed in molar quantities (the molar ratio of precursor to molten salt is 1:5, and the molar ratio of sodium chloride and potassium chloride is 1:1 ) Mix uniformly, place the mixture in a muffle furnace, heat up to 850°C at a rate of 5°C / min and keep it for 12 hours, then cool to room temperature naturally, after washing, filtering, and drying to obtain the original sample that is lithium-rich Layered transition metal oxide (Li 1.2 Mn 0.6 Ni 0.2 O 2 ).

[0043] 2. With a molar ratio of 5:1, mix the lithium-rich layered transition metal oxide and urea evenly and place them in a reaction vessel filled with inert atmosphere in a polytetrafluoroethylene and seal the reaction vessel. The reaction vessel is transferred to a temperature of 210°C In a blast drying o...

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Abstract

The invention belongs to the technical field of lithium ion battery anode materials, and discloses a surface-modified lithium-rich layered transition metal oxide as well as a preparation method and application thereof. The surface-modified lithium-rich layered transition metal oxide is prepared by the following steps that: a transition metal compound precursor, a lithium source and molten salt aremixed, and an obtained mixture is heated to 780-980 DEG C, is cooled to room temperature, cleaning, filtering and drying are performed, so that a lithium-rich layered transition metal oxide can be obtained; and the lithium-rich layered transition metal oxide is uniformly mixed with a carbon-nitrogen source, the mixture is placed in a protective atmosphere so as to be subjected to a hydrothermal reaction at 130-230 DEG C, an obtained product naturally cools, water washing, suction filtration, and drying are performed, so that the surface-modified lithium-rich layered transition metal oxide canbe obtained. The structure of the surface-modified lithium-rich layered transition metal oxide sequentially comprises the lithium-rich layered transition metal oxide, an oxygen vacancy-rich lithium-rich layered transition metal oxide-spinel structure oxide symbiotic layer and a nitrogen-doped carbon nano layer. The surface-modified lithium-rich layered transition metal oxide shows relatively highspecific discharge capacity and cycling stability as an anode material.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and more specifically, relates to a surface-modified lithium-rich layered transition metal oxide and a preparation method and application thereof. Background technique [0002] According to the outline of the national new energy development plan, the rapid development of new energy electric vehicles requires lithium-ion power batteries with higher energy density and power density. The high-cost cathode material in lithium-ion power batteries has always been a key factor restricting the increase in energy density of power lithium-ion batteries. Therefore, to increase the energy density of power batteries and promote their rapid development, it is imperative to develop new cathode materials with high specific capacity or modify existing cathode materials. [0003] At present, the most common commercial cathode material is lithium cobalt oxide LiCoO 2 , Lithium nickelate LiNi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/583H01M10/0525H01M2004/028Y02E60/10
Inventor 林展丁晓凯崔佳祥罗冬谢惠娴任晴晴
Owner GUANGDONG UNIV OF TECH
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