Graphene composite material loaded with cobalt niobate oxide and its preparation method and application

A technology of composite materials and cobalt oxides, applied in the direction of negative electrodes, active material electrodes, electrochemical generators, etc., can solve the problems of low theoretical capacity and poor conductivity of niobium-based oxides, and achieve improved electrochemical performance and large capacity , the effect of high energy density

Active Publication Date: 2022-08-02
INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, niobium-based oxides still have problems such as low theoretical capacity and poor conductivity, so it is still necessary to further explore anode materials with better performance for lithium-ion batteries

Method used

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  • Graphene composite material loaded with cobalt niobate oxide and its preparation method and application
  • Graphene composite material loaded with cobalt niobate oxide and its preparation method and application
  • Graphene composite material loaded with cobalt niobate oxide and its preparation method and application

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preparation example Construction

[0036] The present invention also provides a method for preparing the above-mentioned graphene composite material loaded with cobalt niobate oxide, comprising the following steps:

[0037] S1, providing a graphene oxide dispersion, and mixing the graphene oxide dispersion with a mixed solution to obtain a mixture, wherein the mixed solution includes a cobalt source and a niobium source;

[0038] S2, the mixture is sequentially subjected to ball milling and hydrothermal reaction, and then annealed to obtain the cobalt niobate-supported graphene composite material.

[0039] In step S1, the graphene oxide dispersion liquid includes graphene oxide and a dispersing solvent, wherein the graphene oxide can be prepared by the Hummers method, and the dispersing solvent is preferably anhydrous ethanol. In order to make the distribution of the graphene oxide dispersion more uniform, the graphene oxide dispersion can be ultrasonically dispersed and stirred for a certain period of time, sp...

Embodiment 1

[0056] 34 mg of graphene oxide and 40 mL of anhydrous ethanol were stirred in a 100 mL beaker for 10 min, and then ultrasonically dispersed for 30 min to obtain a graphene oxide dispersion.

[0057] 0.25 g of cobalt acetate tetrahydrate, 1.10 g of hydrated niobium oxalate and 60 mL of absolute ethanol were stirred in a 250 mL three-necked flask until completely dissolved to obtain a mixed solution.

[0058] Under the condition of a 60°C water bath, the graphene oxide dispersion was added dropwise to the three-necked flask containing the mixed solution, and stirred during the dropwise addition, and then continued to stir for 30 min after the dropwise addition to obtain a mixture.

[0059] The mixture was transferred to a ball milling tank for ball milling at a speed of 600 rpm. After ball milling for 10.5 h, the reaction solution was transferred to a hydrothermal kettle, and the hydrothermal reaction was carried out at a temperature of 180 °C, and the reaction was kept at a cons...

Embodiment 2

[0063] 34 mg of graphene oxide and 40 mL of anhydrous ethanol were stirred in a 100 mL beaker for 10 min, and then ultrasonically dispersed for 30 min to obtain a graphene oxide dispersion.

[0064] 0.25 g of cobalt acetate tetrahydrate, 1.10 g of hydrated niobium oxalate and 60 mL of absolute ethanol were stirred in a 250 mL three-necked flask until completely dissolved to obtain a mixed solution.

[0065] Under the condition of a 60°C water bath, the graphene oxide dispersion was added dropwise to the three-necked flask containing the mixed solution, and stirred during the dropwise addition, and then continued to stir for 30 min after the dropwise addition to obtain a mixture.

[0066] The mixture was transferred to a ball milling tank for ball milling at a speed of 600 rpm. After ball milling for 10.5 h, the reaction solution was transferred to a hydrothermal kettle, and the hydrothermal reaction was carried out at a temperature of 180 °C, and the reaction was kept at a cons...

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Abstract

The invention relates to a graphene composite material loaded with cobalt niobate oxide and a preparation method and application thereof. The composite material includes graphene and CoNb supported on the surface of the graphene 2 O 6 material, wherein the CoNb 2 O 6 The material includes at least one stem and a plurality of branches extending outwardly from the stem. The composite material induces the growth of CoNb with a unique backbone-branch structure and high crystallinity through the surface confinement of graphene. 2 O 6 The composite material has high capacity, excellent cycle stability and electrochemical performance, and has a good application prospect as a negative electrode material for lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a graphene composite material loaded with cobalt niobate oxide and a preparation method and application thereof. Background technique [0002] In order to meet the new needs of high-rate energy storage in electric vehicles, aerospace and other fields, it is of strategic significance to develop new lithium-ion electrode materials with high specific capacity, stable cycle performance and low cost. Among them, the negative electrode material has a crucial impact on the specific capacity, cycle performance and safety performance of lithium-ion batteries. [0003] The widely used anode materials in lithium-ion batteries include carbon-based anode materials such as artificial graphite and natural modified graphite, as well as lithium titanate (LTO, Li 4 Ti 5 O 12 ). However, carbon-based anode materials have problems such as poor reversible capacity and rate performance, and eas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 陈鹏宋远强揭斌勇付际
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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