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C-coated Co-MOF hollow nanobelt for negative electrode material of potassium ion battery and preparation method and application

A battery negative electrode and potassium ion technology, applied in nanotechnology for materials and surface science, battery electrodes, secondary battery manufacturing, etc., can solve the problems of lithium scarcity and high cost hindering the development of LIBs, and achieve easy operation, The effect of reducing resistance and simple process

Active Publication Date: 2019-05-28
深圳万知达科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the scarcity and high cost of lithium severely hinder the further development of LIBs in the future

Method used

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  • C-coated Co-MOF hollow nanobelt for negative electrode material of potassium ion battery and preparation method and application
  • C-coated Co-MOF hollow nanobelt for negative electrode material of potassium ion battery and preparation method and application
  • C-coated Co-MOF hollow nanobelt for negative electrode material of potassium ion battery and preparation method and application

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preparation example Construction

[0035] As shown in the figure, a method for preparing a Co-MOF hollow nanobelt coated with a cathode material C for a potassium ion battery of the present invention includes the following steps:

[0036] S1. Under magnetic stirring, dissolve cobalt nitrate in methanol to obtain solution A, where the mass ratio of cobalt nitrate to methanol is (12.5-15):1;

[0037] S2. Under magnetic stirring, dissolve methylimidazole in solution A to obtain solution B, and the mass ratio of methylimidazole to cobalt nitrate is 1: (0.88-2);

[0038] S3. Stir solution B at room temperature for 24 hours to obtain product C;

[0039] S4. Centrifugal separation of product C at 10000-15000 rpm, repeated washing with deionized water and ethanol 3 times, and drying at 60-80°C for 12-24 hours to obtain precursor D;

[0040] S5. Anneal the precursor D in an argon atmosphere at a temperature of 400-600°C for 1 to 6 hours to obtain the precursor carbon-coated Co;

[0041] S6. Dissolve the precursor carbon-coated Co ...

Embodiment 1

[0052] (1) Under magnetic stirring, dissolve 291 mg of cobalt nitrate in 20 mL of methanol to obtain solution A;

[0053] (2) Under magnetic stirring, dissolve 582 mg of methyl imidazole in solution A to obtain solution B;

[0054] (3) Stir the B solution at room temperature for 24 hours to obtain product C;

[0055] (4) Centrifugal separation of C solution at 10000rpm, repeated washing with deionized water and ethanol 3 times, and drying at 60℃12 to obtain precursor D;

[0056] (5) Annealing the synthesized product D in an argon atmosphere at 400°C for 1 hour to obtain carbon-coated Co;

[0057] (6) Take the carbon-coated Co and dissolve it in 15 mL of ethanol and ultrasound for 30 minutes to obtain solution E;

[0058] (7) Weigh 0.8g PVP and fully dissolve it in 5mL DMF to obtain solution F;

[0059] (8) Under magnetic stirring, add solution E to solution F and stir for 24h at room temperature;

[0060] (9). Take 3 mL of mixed solution G with a syringe, spin it at a certain voltage and f...

Embodiment 2

[0063] ((1) Under magnetic stirring, dissolve 291 mg of cobalt nitrate in 20 mL of methanol to obtain solution A;

[0064] (2) Under magnetic stirring, dissolve 400 mg of methyl imidazole in solution A to obtain solution B;

[0065] (3) Stir the B solution at room temperature for 24 hours to obtain product C;

[0066] (4) Centrifugal separation of solution C at 10000 rpm, repeated washing with deionized water and ethanol for 3 times, and drying at 60°C for 12-24 hours to obtain precursor D;

[0067] (5) Annealing the synthesized product D in an argon atmosphere at 300°C for 3 hours to obtain carbon-coated Co;

[0068] (6) Take the carbon-coated Co and dissolve it in 15 mL of ethanol and ultrasound for 45 minutes to obtain solution E;

[0069] (7) Weigh 0.8g PVP and fully dissolve it in 5mL DMF to obtain solution F;

[0070] (8) Under magnetic stirring, add solution E to solution F and stir for 24h at room temperature;

[0071] (9). Take 3 mL of mixed solution G with a syringe, spin it at a...

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Abstract

The invention provides a C-coated Co-MOF hollow nanobelt for a negative electrode material of a potassium ion battery and a preparation method and an application. The preparation method comprises thefollowing steps: S1, dissolving precursor carbon-coated Co in ethanol, and carrying out ultrasonic treatment to obtain solution E, wherein the mass ratio of precursor carbon-coated Co to ethanol is (125-1,250): 1; S2, dissolving PVP fully in DMF to obtain solution F, wherein the mass ratio of PVP to DMF is (500-1,000): 1; S3, adding the solution E to the solution F, and performing uniform stirringat room temperature to obtain mixed solution G, wherein the volume ratio of the solution E to the solution F is 1: (0.5-1.5); S4, spinning the mixed solution G, and collecting a substance as a product H; S5, carbonizing the product H in an argon atmosphere to obtain the C-coated Co-MOF hollow nanobelt. The C-coated Co-MOF hollow nanobelt structure is employed as the negative electrode material ofthe potassium ion battery, thereby improving the conductivity, the cycle performance and the specific capacity of the battery.

Description

Technical field [0001] The invention belongs to the technical field of secondary power battery materials, and specifically relates to a preparation method and application of a potassium ion battery negative electrode material C-coated Co-MOF hollow nanobelt. Background technique [0002] Now, green and rechargeable secondary batteries, especially lithium-ion batteries (LIBs), have been widely used in portable electronics and electric vehicles because of their high energy and power density. However, the scarcity and high cost of lithium seriously hinder the further development of LIBs in the future. In recent years, potassium ion batteries (KIBs) are regaining more attention because of the abundant potassium resources on the earth. K + The redox potential of / K (-2.93V vs. NHE) is close to that of redox Li + / Li(-3.04V and NHE), lower than Na + / Na(-2.71V and NHE), make KIBs have higher potential and safer voltage. [0003] Carbon materials have long been used in many chemistry an...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M4/62H01M10/054H01M10/04B82Y30/00B82Y40/00
CPCY02E60/10Y02P70/50
Inventor 锁国权李丹杨艳玲冯雷侯小江叶晓慧张荔
Owner 深圳万知达科技有限公司