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Molybdenum-doped nickel cobaltate porous yolk-shell-structure material as well as preparation method and application thereof

A technology of shell structure and nickel cobaltate, which is applied in the field of molybdenum-doped nickel cobaltate porous egg yolk-shell structure materials and its preparation, can solve the problem that the electrochemical performance of nickel cobaltate needs to be improved, it is not easy to form defect sites, and the synthesis process is cumbersome Complicated problems, to achieve excellent electrochemical performance, reduce volume change, and strong operability

Active Publication Date: 2021-04-06
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the research of the inventors, the current methods for synthesizing egg yolk shells mainly focus on hard templates, and the synthesis process is cumbersome and complicated, and it is not easy to synthesize
[0005] At the same time, the inventors found that the chemical composition of nickel cobaltate as a double metal oxide is relatively simple, and it is not easy to form defect sites, which leads to the electrochemical performance of nickel cobaltate as a negative electrode material for lithium-ion batteries needs to be improved

Method used

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  • Molybdenum-doped nickel cobaltate porous yolk-shell-structure material as well as preparation method and application thereof
  • Molybdenum-doped nickel cobaltate porous yolk-shell-structure material as well as preparation method and application thereof
  • Molybdenum-doped nickel cobaltate porous yolk-shell-structure material as well as preparation method and application thereof

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Embodiment approach

[0056] The third embodiment of the present invention provides an application of the molybdenum-doped nickel cobaltate porous yolk-shell structure material as a negative electrode material for a lithium-ion battery and / or in the preparation of a lithium-ion battery.

[0057] The present invention adopts the molybdenum-doped nickel cobaltate porous yolk-shell structure material as the negative electrode of lithium-ion batteries and / or to prepare lithium-ion batteries, and has more excellent electrochemical performance.

[0058] The fourth embodiment of the present invention provides a lithium-ion battery negative electrode, including a current collector, a binder, and an active component, and the active component is the above-mentioned molybdenum-doped nickel cobaltate porous egg yolk-shell structure material.

[0059] A fifth embodiment of the present invention provides a lithium-ion battery, including a lithium-ion positive electrode, an electrolyte, and the above-mentioned neg...

Embodiment 1

[0063] Place a 100mL beaker on a magnetic stirrer, add 30mL of N,N-dimethylformamide and 15mL of glycerol, and add 0.055g of Ni(NO 3 ) 3 ·6H 2 O, 0.110g Co(NO 3 ) 2 ·6H 2 O, 0.050gH 24 Mo 7 N 6 o 24 4H 2 O, after the solution was stirred for 30 minutes, 0.199 g of terephthalic acid was added, and the stirring was continued for 1.5 hours until it was completely dissolved, forming a pink solution. The obtained pink solution was transferred to a 100 mL reaction kettle, and solvothermally reacted at 180° C. for 6 h. After cooling, the purple solution was centrifuged and washed. The washed precipitate was dried at 70 °C for 12 h, and the dried precipitate was ground and calcined at 350 °C for 1 h to obtain Mo-doped NiCo 2 o 4 Material.

[0064] The Mo-doped NiCo obtained in this example 2 o 4 The shape of the material is as figure 1 shown, to show that the prepared Mo-doped NiCo 2 o 4 The material is a porous spherical structure.

Embodiment 2

[0066] Place a 100mL beaker on a magnetic stirrer, add 30mL of N,N-dimethylformamide and 15mL of glycerol, and add 0.055g of Ni(NO 3 ) 3 ·6H 2 O, 0.110g Co(NO 3 ) 2 ·6H 2 O, 0.050gH 24 Mo 7 N 6 o 24 4H 2 O, after the solution was stirred for 30 minutes, 0.199 g of terephthalic acid was added, and the stirring was continued for 1.5 hours until it was completely dissolved, forming a pink solution. The obtained pink solution was transferred to a 100 mL reaction kettle, and solvothermally reacted at 180° C. for 6 h. After cooling, the purple solution was centrifuged and washed. The washed precipitate was dried at 70 °C for 12 h, and the dried precipitate was ground and calcined at 500 °C for 1 h to obtain Mo-doped NiCo 2 o 4 Material.

[0067] The Mo-doped NiCo obtained in this example 2 o 4 The shape of the material is as Figure 2~3 , indicating that the prepared Mo-doped NiCo 2 o 4 The material is a porous egg yolk-shell structure, the diameter of the yolk-she...

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Abstract

The invention discloses a molybdenum-doped nickel cobaltate porous yolk-shell-structure material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a precursor containing Ni, Co and Mo from a nickel salt, a cobalt salt and a molybdenum salt by adopting a solvothermal method, heating the precursor to 490-510 DEG C, and conducting calcining to obtain the molybdenum-doped nickel cobaltate porous yolk-shell-structure material. According to the invention, NiCo2O4 crystal lattices are doped with Mo, so Mo replaces a part of Co<3+> in NiCo2O4; and a porous yolk-shell structure is formed by wrapping a yolk inner core with a shell, the shell has a nanoscale diameter, the sum of the thickness of the shell and the radius of the yolk inner core is smaller than the radius of the porous yolk-shell structure, and the yolk inner core is porous particles. According to the preparation method, the molybdenum-doped nickel cobaltate porous yolk-shell-structure material can be prepared only through a two-step method. The prepared molybdenum-doped nickel cobaltate porous yolk-shell-structure material has better electrochemical performance when used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of inorganic material synthesis, and relates to a molybdenum-doped nickel cobaltate porous egg yolk-shell structure material and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-ion batteries have become an important component in portable electronic devices, electric vehicles, and stationary storage systems due to their high energy density, long service life, and environmental friendliness. Metal oxides have significant advantages such as high theoretical capacity, wide availability, and safety, showing great potential as anode materials for next-genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCH01M4/525H01M4/485H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 周国伟任永强王轶男顾少楠曹培杨辰雨
Owner QILU UNIV OF TECH
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