Conductive polymer coated Prussian blue sodium ion battery positive electrode material and preparation method thereof

A conductive polymer, sodium-ion battery technology, applied in the fields of energy materials and electrochemistry, can solve problems such as poor cycle performance and poor rate performance, achieve good rate performance and cycle stability, and be easy to large-scale industrial production. , the effect of improving conductivity

Inactive Publication Date: 2019-09-10
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the technical problems of poor cycle performance and poor rate performance of the above-mentioned Prussian blue analogues, the present invention intends to coat the surface of the Prussian blue analogues through surface modification, and intends to select suitable materials fo

Method used

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  • Conductive polymer coated Prussian blue sodium ion battery positive electrode material and preparation method thereof
  • Conductive polymer coated Prussian blue sodium ion battery positive electrode material and preparation method thereof
  • Conductive polymer coated Prussian blue sodium ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0050] In this embodiment, the Prussian blue analog MnHCFe is prepared by the same method as that of Comparative Example 1, and the conductive polymer-coated Prussian blue sodium-ion battery cathode material is obtained by in-situ polymerization of the conductive polymer monomer on the surface. The specific steps are:

[0051] 1) Add 200 mg of MnHCFe and 10 μL of EDOT in Comparative Example 1 into 40 mL of deionized water, ultrasonically disperse and stir to obtain cloudy liquid C, and keep at 25 °C;

[0052] 2) Dissolve 20 mg ammonium persulfate in 10 mL deionized water to form solution D;

[0053] 3) Add solution D to turbid solution C under stirring state, and continue stirring for 10 hours after the dropwise addition;

[0054] 4) The precipitate obtained in step 3) was centrifuged at 8000 r / min, washed 3 times with deionized water and 2 times with absolute ethanol, and dried in vacuum at 110°C for 24 h to obtain conductive polymer-coated Prussian blue MnHCFe@PEDOT-10, a c...

Embodiment 2

[0060] In this embodiment, the Prussian blue analog MnHCFe is prepared by the same method as that of Comparative Example 1, and the conductive polymer-coated Prussian blue sodium-ion battery cathode material is obtained by in-situ polymerization of the conductive polymer monomer on the surface. The specific steps are:

[0061] 1) Add 200 mg of MnHCFe and 20 μL of EDOT in Comparative Example 1 into 40 mL of deionized water, ultrasonically disperse and stir to obtain cloudy liquid C, and keep at 25 °C;

[0062] 2) Dissolve 40 mg ammonium persulfate in 10 mL deionized water to form solution D;

[0063] 3) Add solution D to turbid solution C under stirring state, and continue stirring for 10 hours after the dropwise addition;

[0064] 4) The precipitate obtained in step 3) was centrifuged at 8000 r / min, washed 3 times with deionized water and 2 times with absolute ethanol, and dried in vacuum at 110°C for 24 h to obtain conductive polymer-coated Prussian blue MnHCFe@PEDOT-20, a c...

Embodiment 4

[0070] In this embodiment, the Prussian blue analog MnHCFe is prepared by the same method as that of Comparative Example 1, and the conductive polymer-coated Prussian blue sodium-ion battery cathode material is obtained by in-situ polymerization of the conductive polymer monomer on the surface. The specific steps are:

[0071] 1) Add 200 mg of MnHCFe and 50 μL of EDOT in Comparative Example 1 into 40 mL of deionized water, ultrasonically disperse and stir to obtain cloudy liquid C, and keep at 25 °C;

[0072] 2) Dissolve 100 mg ammonium persulfate in 10 mL deionized water to form solution D;

[0073] 3) Add solution D to turbid solution C under stirring state, and continue stirring for 10 hours after the dropwise addition;

[0074] 4) The precipitate obtained in step 3) was centrifuged at 8000 r / min, washed 3 times with deionized water and 2 times with absolute ethanol, and dried in vacuum at 110°C for 24 h to obtain conductive polymer-coated Prussian blue MnHCFe@PEDOT-50 is ...

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Abstract

The invention discloses a conductive polymer coated Prussian blue sodium ion battery positive electrode material and a preparation method thereof. The conductive polymer coated Prussian blue sodium ion battery positive electrode material comprises an inner core layer and an outer coating layer; the inner core layer is a Prussian blue analogue; and the outer coating layer is made of a conductive polymer. The conductive polymer is polymerized in situ on the surface of the Prussian blue analogue, so that a core-shell structure with a bulk phase material being the Prussian blue analogue and the surface coated with the conductive polymer is realized, the ionic conductivity and the electron conductivity of the material are improved, meanwhile the cycling stability and the rate performance of thematerial are also improved, and a new way is provided for large-scale application of the Prussian blue analogue to a sodium ion battery.

Description

technical field [0001] The invention relates to a Prussian blue-like sodium-ion battery cathode material and a preparation method thereof, belonging to the fields of energy materials and electrochemistry. Background technique [0002] Lithium-ion batteries have shown broad application prospects in portable electronic devices and electric vehicles due to their advantages such as high specific capacity, high power density, stable discharge, and environmental friendliness. However, the reserves of lithium resources in the earth's crust are limited, and the price of lithium raw materials continues to rise, hindering the sustainable development of lithium-ion batteries. In addition to having a similar working principle to lithium-ion batteries, sodium-ion batteries also have the advantages of abundant resources and low cost, and are considered to be an ideal choice for next-generation energy storage power sources. At present, the anode materials for sodium-ion batteries that hav...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M4/62H01M10/054
CPCH01M4/366H01M4/58H01M4/602H01M4/624H01M10/054H01M2004/028Y02E60/10
Inventor 姜银珠王晓
Owner ZHEJIANG UNIV
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