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Preparation method of ZIF-67 and ZIF-67 derivative cobalt selenide/carbon electrode material

A technology of ZIF-67 and cobalt selenide, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of accelerating the commercialization and industrialization of MOF-based negative electrode materials, toxic solvents, low yield, etc., and achieve accelerated commercialization and industrialization, improve conductivity, and accelerate the effect of efficient transfer

Active Publication Date: 2021-11-30
国网镇江综合能源服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on controlling the shape of MOFs nanocrystals is not as perfect as that of metal nanoparticles; at present, many MOFs synthesis have problems such as low timeliness, low yield, and toxic solvents; Commercialization and industrialization of materials is critical

Method used

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  • Preparation method of ZIF-67 and ZIF-67 derivative cobalt selenide/carbon electrode material
  • Preparation method of ZIF-67 and ZIF-67 derivative cobalt selenide/carbon electrode material
  • Preparation method of ZIF-67 and ZIF-67 derivative cobalt selenide/carbon electrode material

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Experimental program
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Effect test

Embodiment 1

[0036] First, KOH and 2-methylimidazole were added to deionized water successively, and after ultrasonication for 5 minutes and magnetic stirring for 10 minutes, a mixed solution A was obtained; then Co(NO 3 ) 2 ·6H 2O was dissolved in deionized water to prepare solution B. Under the condition of stirring, solution B was added into solution A, and after stirring for 6 hours, the polyhedral ZIF-67 powder was centrifuged, washed and dried. The reaction temperature was 12°C. 2-Methylimidazole and Co(NO 3 ) 2 ·6H 2 The molar ratio of O is about 8:1, and the molar concentration of KOH in the reaction solution is 3mol L -1 .

[0037] Depend on figure 1 It can be seen that the XRD spectrum of the prepared ZIF-67 material shows that the position of the characteristic peak of the material is consistent with that of the standard peak of ZIF-67, indicating that the synthesized product is ZIF-67.

[0038] Depend on figure 2 It can be seen that the SEM image of the prepared ZIF-...

Embodiment 2

[0041] The difference from Example 1 is that the concentration of KOH is 0.1mol L -1 . Figure 4 The SEM image in shows that when the concentration of KOH is 0.1mol L -1 , the morphology of the obtained product is still dominated by two-dimensional leaf-like structures, but the thickness of the sheets prepared by this method is larger than that of the reported aqueous solution; in addition, a three-dimensional carambola-like structure is also found in the picture , indicating that with the addition of KOH, the morphology of the product tends to change from a two-dimensional structure to a three-dimensional structure.

Embodiment 3

[0043] The difference from Example 1 is that the concentration of KOH is 1mol L -1 . Such as Figure 5 As shown, SEM shows that the obtained material is mainly three-dimensional granular structure with only a small amount of two-dimensional structure. Compared with Example 2, it can be seen that 2mol L -1 KOH further induced the ZIF-67 crystal to change from two-dimensional growth to three-dimensional growth. It can be seen that the addition of high concentration of KOH can accelerate the change of crystal growth direction.

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Abstract

The invention discloses a preparation method of ZIF-67 and a ZIF-67 derivative cobalt selenide / carbon electrode material, which comprises the following steps: dissolving 2-methylimidazole and KOH in deionized water to obtain a transparent solution, adding a Co(NO3)2.6H2O solution into the transparent solution, and stirring to obtain ZIF-67 powder, wherein the amount-of-substance ratio of the 2-methylimidazole to the Co(NO3)2.6H2O is 8:1, and the amount-of-substance concentration of the KOH is 0.1 to 3 mol L <-1>; and carbonizing the polyhedral ZIF-67 precursor, and preparing the cobalt selenide / carbon composite material by adopting different selenylation methods. According to the invention, the ZIF-67 with different morphologies is synthesized in an aqueous solution under the assistance of KOH for the first time, and the derived cobalt selenide / carbon composite material shows excellent lithium storage performance. The method has the characteristics of green solvent, simple process, short reaction time, high yield and controllable product morphology.

Description

technical field [0001] The invention relates to a preparation method of ZIF-67 and its derived cobalt selenide / carbon electrode material, belonging to the technical field of new materials. Background technique [0002] With the ever-increasing energy consumption, the rapid development of portable electronic products and electric vehicles, the pursuit of advanced rechargeable energy storage materials / devices with high efficiency and durability has become increasingly intense. As a new generation of energy storage devices, lithium-ion batteries have great development potential in the field of energy storage. It is of great significance to explore anode materials with high specific capacity and stability. In recent years, transition metal selenides based on electrochemical conversion reactions have attracted extensive attention due to their high reversible capacities. However, transition metal selenides suffer from poor cycle performance and rate capability due to large volum...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/052H01M10/42
CPCH01M4/58H01M4/625H01M4/628H01M10/052H01M10/4235H01M2004/027Y02E60/10
Inventor 闻韬朱学勇张俊豪薛艳春沈克军顾执明杨茹王鑫
Owner 国网镇江综合能源服务有限公司
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