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CuO-coated Cu-BTC composite electrode with rod-shaped structure and preparation method thereof

A composite electrode and rod-shaped structure technology, applied in the direction of negative electrodes, structural parts, battery electrodes, etc., can solve the problems of difficult application of full batteries, low first-cycle Coulombic efficiency, and limited commercial prospects, etc., to achieve high specific capacity and improve Coulombic efficiency , High Coulombic efficiency

Pending Publication Date: 2022-02-18
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MOFs generally have extremely low first-cycle Coulombic efficiency, which greatly limits their commercial prospects.
According to literature reports, the reversible specific capacity of Cu-BTC anode material is 626.4 mAh g -1 , but the Coulombic efficiency in the first cycle is lower than 36.6% (ChemElectroChem 2020, 7, 4003–4009), which is difficult to apply to full cells

Method used

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  • CuO-coated Cu-BTC composite electrode with rod-shaped structure and preparation method thereof
  • CuO-coated Cu-BTC composite electrode with rod-shaped structure and preparation method thereof
  • CuO-coated Cu-BTC composite electrode with rod-shaped structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] A rod-shaped CuO@Cu-BTC composite electrode, Cu-BTC accounts for 86.40 wt% of the total mass of the composite electrode, CuO accounts for 13.60 wt% of the total mass of the composite electrode, and the average particle size of CuO is 6.98 nm . Its preparation method comprises the following steps:

[0023] (1) Preparation of CuO nanoparticles:

[0024] Take 0.300 mol L respectively -1 CuSO 4 ·5H 2 O and Na 2 CO 3 80 mL of aqueous solution was recorded as solutions A and B respectively, and the solutions A and B were heated to 50 °C at the same time. Under ultrasonic conditions, add solution B to solution A until all green precipitates are formed. The product was collected by centrifugation, washed three times with deionized water at 60 °C, and dried at 70 °C for 6 h. Finally, the product was decomposed in a muffle furnace preheated at 600 °C for 2 h to obtain copper oxide nanoparticles.

[0025] (2) Solution configuration:

[0026] Take 12 g H 3 Put BTC into 2...

Embodiment 2

[0030] A rod-shaped CuO@Cu-BTC composite electrode, Cu-BTC accounts for 89.25 wt% of the total mass of the composite electrode, CuO accounts for 10.75 wt% of the total mass of the composite electrode, and the average particle size of CuO is 6.92 nm . Its preparation method comprises the following steps:

[0031] (1) Preparation of CuO nanoparticles:

[0032] Take 0.8 mol L respectively -1 CuSO 4 ·5H 2 O and Na 2 CO 3 150 mL of aqueous solution, respectively recorded as solutions A and B, while heating solutions A and B to 70 °C. Under ultrasonic conditions, add solution B to solution A until all green precipitates are formed. The product was collected by centrifugation, washed three times with deionized water at 60 °C, and dried at 70 °C for 6 h. Finally, the product was decomposed in a muffle furnace preheated at 700 °C for 3 h to obtain copper oxide nanoparticles.

[0033] (2) Solution configuration:

[0034] Take 18 g H 3 Put BTC into 300 mL of ethanol and water...

Embodiment 3

[0038] A rod-shaped CuO@Cu-BTC composite electrode, Cu-BTC accounts for 91.69 wt% of the total mass of the composite electrode, CuO accounts for 8.31 wt% of the total mass of the composite electrode, and the average particle size of CuO is 4.78 nm . Its preparation method comprises the following steps:

[0039] (1) Preparation of CuO nanoparticles:

[0040] Take 0.5 mol L respectively -1 CuSO 4 ·5H 2 O and Na 2 CO 3 Aqueous solution 100 mL, respectively recorded as solution A and B, while heating solutions A and B to 60 ℃. Under ultrasonic conditions, add solution B to solution A until all green precipitates are formed. The product was collected by centrifugation, washed three times with deionized water at 60 °C, and dried at 70 °C for 6 h. Finally, the product was decomposed in a muffle furnace preheated at 600 °C for 3 h to obtain copper oxide nanoparticles.

[0041] (2) Solution configuration:

[0042] Take 15.8 g H 3 Put BTC into 200 mL of ethanol and water mix...

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Abstract

The invention discloses a CuO-coated Cu-BTC composite electrode with a rod-like structure and a preparation method thereof. The composite electrode comprises a rod-like Cu-BTC matrix and ultra-nano CuO particles doped in Cu-BTC, the average particle size of the CuO particles is 6.98 nm or less, the Cu-BTC accounts for 86.40-96.36 wt% of the total mass of the composite electrode, and the rest content of the composite electrode is the CuO particles; the preparation method of the material comprises the following steps of (1) preparing CuO particles, and dispersing copper oxide into a solvent; and (2) slowly adding the dispersion liquid into an H3BTC solution, stirring for a certain time, centrifugally separating and washing to obtain the target composite material. The CuO-coated Cu-BTC composite electrode material with the rod-shaped structure is high in specific capacity and first-circle coulombic efficiency, Cu-BTC contains rich active sites and can provide relatively high mass specific capacity in charging and discharging, and the nanoscale CuO particles can promote reversible decomposition of some inert products, so coulombic efficiency of the first few circles of the electrode material is improved, and electrochemical performance of an electrode material is improved.

Description

technical field [0001] The invention relates to a composite electrode and a preparation method thereof, in particular to a rod-shaped CuO@Cu-BTC composite electrode and a preparation method thereof. Background technique [0002] The current lithium-ion battery technology has become more and more difficult to meet the growing needs of people, and the research and development of high-energy-density lithium-ion batteries has become a research hotspot in academia and industry. The core parameters such as the energy density and cycle performance of the battery mainly depend on the electrode material. Metal-organic frameworks (MOFs) have high specific surface area, large porosity, high stability, diverse structures, adjustable channels, rich The characteristics of metal ions and organic ligands have attracted great attention in lithium battery electrodes (especially negative electrodes) in recent years, and some MOFs have shown extremely high theoretical specific capacities. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/36H01M10/0525
CPCH01M4/483H01M4/362H01M10/0525H01M2004/027Y02E60/10
Inventor 孟春凤胡品飞袁爱华周虎
Owner JIANGSU UNIV OF SCI & TECH
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