Preparation of high-capacity molybdenum selenide-chlorella derived carbon less-layer compound battery cathode material

A composite material, battery negative electrode technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor conductivity of molybdenum selenide, poor long-term cycle stability, easy structure collapse, etc., to reduce water body The effect of pollution, improving electron conductivity, suppressing agglomeration

Active Publication Date: 2019-05-10
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the volume expansion of molybdenum selenide during the process of intercalating sodium, the structure is easy to collapse, resulting in capacity decay, poor long-term cycle stability, and poor conductivity of molybdenum selenide.

Method used

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  • Preparation of high-capacity molybdenum selenide-chlorella derived carbon less-layer compound battery cathode material
  • Preparation of high-capacity molybdenum selenide-chlorella derived carbon less-layer compound battery cathode material
  • Preparation of high-capacity molybdenum selenide-chlorella derived carbon less-layer compound battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Weigh 2 g of chlorella and 6 g of phosphomolybdic acid into 0.4 L of distilled water, stir rapidly for 12 hours, centrifuge once with water and dry in an oven at 60 °C;

[0031] 2) Grind the brown-green massive solid obtained in step 1) to powder, then weigh the brown-green solid powder and selenium powder with a mass ratio of 1:2 and place them in different corundum boats, and place them in Ar 95% / H 2 Calcined at 600°C for 2 hours in a 5% atmosphere tube furnace to collect a black solid sample, which is a few-layer molybdenum selenide-chlorella-derived carbon composite;

[0032] Obtained by XRD experiment figure 1 The XRD pattern of the few-layer molybdenum selenide-chlorella-derived carbon complex, by figure 1 It can be seen that the prepared material is molybdenum selenide, and its diffraction peak position matches the standard spectrum of molybdenum selenide (JCPDS, 17-0887). It can be seen from the figure that the diffraction peak is very broad, indicating th...

Embodiment 2

[0035] 1) Weigh 2 g of chlorella and 8 g of sodium molybdate into 0.6 L of distilled water, stir rapidly for 6 h, centrifuge once with water and dry in an oven at 80 °C;

[0036] 2) Grind the brown-green blocky solid obtained in step 1) to powder, then weigh the brown-green solid powder and selenium powder with a mass ratio of 1:3 and place them in different corundum boats, and place them in Ar 95% / H 2 Calcined at 500°C for 2 hours in a 5% atmosphere tube furnace to collect a black solid sample, which is a few-layer molybdenum selenide-chlorella-derived carbon composite;

[0037] The few-layer molybdenum selenide-chlorella-derived carbon composite prepared in this example: conductive agent super P carbon: binder CMC is mixed and ground according to the mass percentage of 80 : 10 : 10, and then evenly coated on the copper foil for work Electrode, metal sodium sheet as counter electrode and reference electrode, 1 mol / L NaClO 4 / PC+EC Assembled coin cells for the electrolyte; a...

Embodiment 3

[0039] 1) Weigh 2 g of chlorella and 6 g of phosphomolybdic acid into 0.4 L of distilled water, stir rapidly for 12 hours, centrifuge once with water and dry in an oven at 70 °C;

[0040] 2) Grind the brown-green blocky solid obtained in step 1) to powder, then weigh the brown-green solid powder and selenium powder with a mass ratio of 1:2 and place them in different corundum boats, and place them in Ar 95% / H 2 Calcined in a 5% atmosphere tube furnace at 700°C for 3 hours, collected a black solid sample, which was a few-layer molybdenum selenide-chlorella-derived carbon composite;

[0041] The few-layer molybdenum selenide-chlorella-derived carbon composite prepared in this example: conductive agent super P carbon: binder CMC is mixed and ground according to the mass percentage of 80 : 10 : 10, and then evenly coated on the copper foil for work Electrode, metal sodium sheet as counter electrode and reference electrode, 1 mol / L NaClO 4 / PC+EC Assembled coin cells for the elec...

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Abstract

The invention belongs to the field of sodium ion battery materials, and particularly relates preparation of a high-capacity molybdenum selenide-chlorella derived carbon less-layer compound battery cathode material. The preparation comprises the steps of: firstly adding chlorella and a molybdenum source in distilled water; carrying out stirring at a room temperature for a certain time and then carrying out centrifugal drying; and further carrying out calcination and selenylation to obtain a less-layer molybdenum selenide-chlorella derived carbon compound. Results show that the sodium ion battery cathode material has excellent electrochemical property. The molybdenum selenide in the material is a less-layer structure (1-4 layers) and the distance between adjacent layers is about 0.66 nm, sothat the volume expansion in the charging / discharging process can be effectively buffered; and the chlorella derived carbon has in-situ N and P heteroatim doping, so that the less-layer molybdenum selenide structure can be effectively fixed and then the sodium storage performance is improved. The preparation is simple in process, strong in operability, wide in raw material source, low in cost andsuitable for large-scale production, and accords with environment requirements.

Description

technical field [0001] The invention belongs to the field of sodium ion battery materials, and in particular relates to the preparation of a high-capacity molybdenum selenide-chlorella-derived carbon few-layer composite battery negative electrode material. Background technique [0002] With the rapid development of society, people's demand for energy for sustainable development is increasing, so rechargeable batteries are favored by people. Lithium-ion batteries have high energy density and have been widely used in various fields of our lives, from many portable electronic devices to electric vehicles. However, lithium resources are unevenly distributed and scarce on the earth, which limits its further development. Sodium, which is in the same main group as lithium, is similar to lithium in physical and chemical properties, and has a wide range of sources and low price. Therefore, sodium-ion batteries are expected to replace lithium-ion batteries in our daily life. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCY02E60/10
Inventor 曾令兴康碧玉罗奋强许丽洪刘淑婷李彦辰钱庆荣陈庆华黄宝铨肖荔人
Owner FUJIAN NORMAL UNIV
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