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Nanorod‑nanosheet interconnected li 2 co 2 (moo 4 ) 3 Materials and their preparation methods and applications

A technology of interconnection and nanosheets, applied in the field of nanomaterials and electrochemistry, can solve problems such as short cycle life, capacity fading, and easy collapse, and achieve the effects of increasing contact area, good uniformity, and excellent electrochemical performance

Active Publication Date: 2017-09-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In general, electrode materials that undergo intercalation-deintercalation reactions often exhibit short cycle life because their structures tend to collapse after repeated deformations, resulting in a large capacity fading

Method used

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  • Nanorod‑nanosheet interconnected li <sub>2</sub> co <sub>2</sub> (moo <sub>4</sub> ) <sub>3</sub> Materials and their preparation methods and applications
  • Nanorod‑nanosheet interconnected li <sub>2</sub> co <sub>2</sub> (moo <sub>4</sub> ) <sub>3</sub> Materials and their preparation methods and applications
  • Nanorod‑nanosheet interconnected li <sub>2</sub> co <sub>2</sub> (moo <sub>4</sub> ) <sub>3</sub> Materials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Nanorod-nanosheet interconnected Li 2 co 2 (MoO 4 ) 3 The preparation method of material, it comprises the steps:

[0034] 1) 5.6mmol lithium chloride monohydrate and 4.3mmol cobalt chloride hexahydrate were mixed and aged for 24 hours;

[0035] 2) Dissolve the solid powder obtained in step 1) in 30ml deionized water and stir for 1 hour to form a clear solution;

[0036] 3) Dissolving 5.4 mmol of sodium molybdate monohydrate in 20 ml of deionized water was added dropwise to the solution obtained in step 2) and stirred for 2 hours;

[0037]4) Put the solution obtained in step 3) and the pretreated nickel foam with a size of 0.4mm*20mm*50mm into the reaction kettle together, conduct a hydrothermal reaction at 120°C for 12 hours, take out the reaction kettle, and let it cool naturally to room temperature , take out the nickel foam with active substances, ultrasonically in deionized water for 5 minutes, rinse several times with deionized water and alcohol, and dry;

...

Embodiment 2

[0046] Nanorod-nanosheet interconnected Li 2 co 2 (MoO 4 ) 3 The preparation method of material, it comprises the steps:

[0047] 1) 1.0 mmol of lithium sulfate monohydrate and 1.5 mmol of cobalt chloride hexahydrate were mixed and aged for 24 hours;

[0048] 2) Dissolve the solid powder obtained in step 1) in 30ml deionized water and stir for 1 hour to form a clear solution;

[0049] 3) Dissolving 1.8mmol sodium molybdate monohydrate in 20ml deionized water was added dropwise to the solution obtained in step 2) and stirred for 2 hours;

[0050] 4) Put the clarified solution obtained in step 3) and the pretreated nickel foam with a size of 0.4mm*20mm*50mm into the reaction kettle together, and conduct a hydrothermal reaction at 100°C for 8 hours, take out the reaction kettle, and cool naturally to At room temperature, take out the nickel foam with active substances, ultrasonicate it in deionized water for 5 minutes, rinse it several times with deionized water and alcohol,...

Embodiment 3

[0055] Nanorod-nanosheet interconnected Li 2 co 2 (MoO 4 ) 3 The preparation method of material, it comprises the steps:

[0056] 1) 22.5mmol lithium chloride monohydrate and 15mmol cobalt sulfate heptahydrate were mixed and aged for 24 hours;

[0057] 2) Dissolve the solid powder obtained in step 1) in 30ml deionized water and stir for 1 hour to form a clear solution;

[0058] 3) Dissolving 27mmol sodium molybdate monohydrate in 20ml deionized water was added dropwise to the solution obtained in step 2) and stirred for 2 hours;

[0059] 4) Put the solution obtained in step 3) and the pretreated nickel foam with a size of 0.4mm*20mm*50mm into the reaction kettle together, conduct a hydrothermal reaction at 140°C for 14 hours, take out the reaction kettle, and let it cool naturally to room temperature , take out the nickel foam with active substances, ultrasonically in deionized water for 5 minutes, rinse several times with deionized water and alcohol, and dry;

[0060] 5...

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Abstract

The invention relates to an Li2Co2(MoO4)3 material with mutual connection of nanorods and nanosheets and a preparation method thereof. The Li2Co2(MoO4)3 material can be used as supercapacitor active material, and the Li2Co2(MoO4)3 nanorods grown on a substrate are used as a skeleton, and are mutually connected by the Li2Co2(MoO4)3 nanosheets to form a three-dimensional structure. The Li2Co2(MoO4)3 material has the beneficial effects that (1) the cyclic reversibility is good; the one-dimensional structure of the nanorods has good axial electron transmitting property, and the high-power electric charging and discharging can be favorably realized; by utilizing the nanosheets for connecting the nanorods, the contact area of an electrode and an electrolyte is increased, and multiple reaction sites are provided; (2) a simple hydrothermal and heat treatment combining method is adopted, and the prepared material has higher purity and excellent uniformity; (3) the technology is simple.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a Li 2 co 2 (MoO 4 ) 3 A material and a preparation method thereof, the material can be used as an active material for a supercapacitor. Background technique [0002] With the continuous development of new energy sources and the development of portable small electronic devices, exploring a new generation of energy storage devices has become an important topic for sustainable development in the 21st century. As a mainstream energy storage device, batteries can provide high energy density, but have low output power, long charge and discharge cycles, poor temperature characteristics and potential safety hazards. Traditional capacitors cannot be ideal energy storage devices due to their low energy density. In order to solve the above problems, supercapacitors, which have the advantages of both traditional capacitors and batteries, have been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/30H01G11/24H01G11/26B82Y30/00B82Y40/00
CPCY02E60/13
Inventor 麦立强赫库尔·穆隆达·卡乐乐杜春晖魏湫龙晏梦雨
Owner WUHAN UNIV OF TECH