Cobalt oxide nanosheet coated with nitrogen-doped carbon layer and preparation method and energy storage application of cobalt oxide nanosheet

A nitrogen-doped carbon and cobalt oxide technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problem of material specific capacity and rate performance deterioration, poor electrical conductivity and ionic conductivity, The material is prone to polarization and other problems, achieving the effects of excellent specific capacity and rate performance, easy process control and low cost

Pending Publication Date: 2021-11-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cobalt oxide still has the following problems as a negative electrode material for lithium-ion batteries: first, cobalt oxide has volume expansion and contraction when lithium ions are intercalated and extracted, which makes the electrode material pulverized and falls off from the current collector, which eventually leads to a decrease in battery capacity. attenuation
Secondly, the electrical conductivity and ion conductivity of cobalt oxide are relatively poor, so the material is prone to polarization, which leads to poor specific capacity and rate performance of the material.

Method used

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  • Cobalt oxide nanosheet coated with nitrogen-doped carbon layer and preparation method and energy storage application of cobalt oxide nanosheet
  • Cobalt oxide nanosheet coated with nitrogen-doped carbon layer and preparation method and energy storage application of cobalt oxide nanosheet
  • Cobalt oxide nanosheet coated with nitrogen-doped carbon layer and preparation method and energy storage application of cobalt oxide nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example uses solvothermal synthesis of cobalt oxide nanosheet precursors:

[0030] Weigh 0.873g Co(NO 3 ) 2 ·6H 2 Add O to 30 mL of deionized water, stir for 30 min, add 0.54 g of urea, and stir until a solution free of solid precipitates is formed. Then the solution was added into a reaction kettle with a volume of 50 mL, and kept in an electric heating constant temperature blast drying oven at a temperature of 160° C. for 16 hours. Cool naturally to room temperature to form a pink precipitate in the reaction kettle, alternately centrifuge with ethanol and deionized water, and dry in an oven to obtain a cobalt oxide nanosheet precursor. Its FESEM photo as figure 1 shown.

Embodiment 2

[0032] This embodiment prepares cobalt oxide nanosheets according to the following steps

[0033] (1) Solvothermal synthesis of cobalt oxide nanosheet precursors:

[0034] Weigh 0.873g Co(NO 3 ) 2 ·6H 2 Add O to 30 mL of deionized water, stir for 30 min, add 0.54 g of urea, and stir until a solution free of solid precipitates is formed. Then the solution was added into a reaction kettle with a volume of 50 mL, and kept at a temperature of 160° C. in an electric thermostat blast drying oven for 16 hours. Cool naturally to room temperature to form a pink precipitate in the reaction kettle, alternately centrifuge with ethanol and deionized water, and dry in an oven to obtain a cobalt oxide nanosheet precursor.

[0035] (2) Synthesis of cobalt oxide nanosheets by argon annealing

[0036] Place the cobalt oxide nanosheet precursor in a burning boat, and then raise the temperature in the tube furnace to 400°C under an argon atmosphere, with a heating rate of 5°C min -1 , heat-...

Embodiment 3

[0038] In this example, cobalt oxide nanosheet precursor@polyvinylpyrrolidone layer is prepared according to the following steps:

[0039] (1) Solvothermal synthesis of cobalt oxide nanosheet precursors

[0040] Weigh 0.873g Co(NO 3 ) 2 ·6H 2Add O to 30 mL of deionized water, stir for 30 min, add 0.54 g of urea, and stir until a solution free of solid precipitates is formed. Then the solution was added into a reaction kettle with a volume of 50 mL, and kept at a temperature of 160° C. in an electric thermostat blast drying oven for 16 hours. Cool naturally to room temperature to form a pink precipitate in the reaction kettle, alternately centrifuge with ethanol and deionized water, and dry in an oven to obtain a cobalt oxide nanosheet precursor.

[0041] (2) Obtain cobalt oxide nanosheet precursor@polyvinylpyrrolidone layer in water bath

[0042] First prepare the mixed solution that deionized water and ethylene glycol volume ratio are 1:5, then add 0.5g polyvinylpyrrolid...

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Abstract

The invention discloses a nitrogen-doped carbon layer-coated cobalt oxide nanosheet and a preparation method and energy storage application thereof. The preparation method comprises the following steps: thermally synthesizing a cobalt oxide nanosheet precursor through a solvent, and then loading a polyvinylpyrrolidone coating layer which is simultaneously used as a nitrogen source and a carbon source on the surface of the cobalt oxide nanosheet precursor; finally, carrying out high-temperature calcination under the protection of an argon atmosphere, and fully utilizing in-situ carbonization and decomposition of polyvinylpyrrolidone to obtain the cobalt oxide nanosheet coated with the nitrogen-doped carbon layer. The material is simple in preparation method, low in cost, easy to control in process and capable of being produced in batches; and when the cobalt oxide nanosheet coated with the nitrogen-doped carbon layer prepared by the invention is used as a lithium ion battery negative electrode material, the cobalt oxide nanosheet has excellent specific capacity and rate capability.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrode material development, in particular to the preparation of cobalt oxide nanosheets coated with nitrogen-doped carbon layers. Background technique [0002] With the continuous updating of various electronic devices, people's attention to energy storage is increasing, which makes the development of high-performance lithium-ion batteries bound to become a trend. The excellent energy storage performance of lithium-ion batteries is mainly related to the participation of active materials. Therefore, finding anode materials with high lithium storage capacity and good safety and stability is the direction that researchers have been paying attention to. Cobalt oxide has been widely studied by researchers because of its abundant reserves, convenient preparation, and large theoretical capacity. Cobalt oxide undergoes a reversible phase transition during lithium intercalation, generating Li during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/523H01M4/62H01M4/625H01M10/0525B82Y40/00B82Y30/00Y02E60/10
Inventor 王岩查志飞吴玉程余翠平张剑芳秦永强崔接武张勇
Owner HEFEI UNIV OF TECH
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