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Preparation method of composite sodium ion battery negative electrode material with long-lifetime and few layer

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, poor stability, and low specific capacity of molybdenum disulfide, improve electronic conductivity and facilitate penetration. Diffusion, the effect of increasing electrical conductivity

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

AI Technical Summary

Problems solved by technology

[0003] The traditional commercial lithium-ion battery anode material graphite has low specific capacity and poor stability in sodium-ion batteries, while molybdenum disulfide has a special layered structure and has a high specific capacity in sodium-ion batteries
However, sodium ions have a larger atomic radius than lithium ions, resulting in greater volume expansion during charge and discharge, resulting in material pulverization and structural collapse, affecting the stability of the material, and molybdenum disulfide itself has poor conductivity.

Method used

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  • Preparation method of composite sodium ion battery negative electrode material with long-lifetime and few layer
  • Preparation method of composite sodium ion battery negative electrode material with long-lifetime and few layer
  • Preparation method of composite sodium ion battery negative electrode material with long-lifetime and few layer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Weigh 2g of chlorella and 5g of phosphomolybdic acid into 0.4L of distilled water, stir for 12h, centrifuge once and place in an oven at 60℃ for drying;

[0035] 2) After mixing the dark green block solid obtained in step 1) with 2 times the mass of sulfur powder, the mixture is heated at Ar 95%\H 2 Calcined in a 5% atmosphere tube furnace at 600°C for 2 hours, and collect a black solid sample, which is a low-layer molybdenum disulfide-chlorella-derived carbon composite material;

[0036] Obtained by XRD experiment figure 1 The XRD pattern of the few-layer molybdenum disulfide-Chlorella-derived carbon composite material, by figure 1 It can be seen that the synthesized material is molybdenum disulfide, and its diffraction peak position matches the standard pattern of molybdenum disulfide (JCPDS, 089-5112). And it has a wide diffraction peak, which means that the synthesized molybdenum disulfide has an ultra-small particle size. It is worth noting that the diffraction peak...

Embodiment 2

[0039] 1) Weigh 2g of chlorella and 8g of ammonium molybdate into 0.4L of distilled water, stir for 12h, centrifuge once and place in an oven at 80℃ for drying;

[0040] 2) After mixing the dark green block solid obtained in step 1) with 2 times the mass of sulfur powder, the mixture is heated at Ar 95%\H 2 Calcined in a 5% atmosphere tube furnace at 700°C for 2 hours, and collect a black solid sample, which is a low-layer molybdenum disulfide-chlorella-derived carbon composite material;

[0041] The few-layer molybdenum disulfide-chlorella-derived carbon composite material prepared by this embodiment: conductive agent super P carbon: binder CMC according to the mass percentage 80:10:10, mixed and ground, and evenly coated on the copper foil for work Electrode, metal sodium sheet is counter electrode and reference electrode, 1mol / L NaClO 4 / PC+EC is the electrolyte solution assembled into button cell; all assembly is carried out in an inert atmosphere glove box.

Embodiment 3

[0043] 1) Weigh 2g of chlorella and 5g of phosphomolybdic acid into 0.4L of distilled water, stir for 12h, centrifuge once and place in an oven at 60℃ for drying;

[0044] 2) After mixing the dark green block solid obtained in step 1) with 2 times the mass of sulfur powder, the mixture is heated at Ar 95%\H 2 Calcined in a 5% atmosphere tube furnace at 500°C for 2 hours, and collect a black solid sample, which is a low-layer molybdenum disulfide-chlorella-derived carbon composite material;

[0045] The few-layer molybdenum disulfide-chlorella-derived carbon composite material prepared by this embodiment: conductive agent super P carbon: binder CMC according to the mass percentage 80:10:10, mixed and ground, and evenly coated on the copper foil for work Electrode, metal sodium sheet is counter electrode and reference electrode, 1mol / L NaClO 4 / PC+EC is the electrolyte solution assembled into button cell; all assembly is carried out in an inert atmosphere glove box.

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Abstract

The invention belongs to the technical field of a sodium ion battery material, and particularly relates to preparation of a composite sodium battery negative electrode material with a molybdenum disulfide-chlorella derived few carbon layer having large-current and long-lifetime characteristic. Molybdenum disulfide in the material has a few-layer structure with 1-4 layers and has ultrasmall nanometer gain size (5-10 nanometers); and chlorella derived carbon is amorphous carbon and is provided with rich N and P heteroatom doping. The technical scheme comprises the following steps of adding chlorella and a molybdenum source into an aqueous solution, performing centrifugal drying after stirring for a certain time, and preparing the molybdenum disulfide-chlorella derived carbon composite layerwith the few-layer structure by calcination and vulcanization. A result shows that the sodium ion battery negative electrode material has the sodium storage characteristic of large current and long lifetime; and the preparation process is simple and is high in operability, wide in raw material source and low in cost, mass production can be achieved, and the environmental requirement is met.

Description

Technical field [0001] The invention belongs to the technical field of sodium ion battery materials, and in particular relates to the preparation of a molybdenum disulfide-chlorella-derived carbon few-layer composite sodium ion battery negative electrode material with high current and long life characteristics. Background technique [0002] In the secondary battery energy storage system, lithium-ion batteries have developed rapidly in recent years and have been widely used in our lives, such as various portable electronic products, communication equipment, electric vehicles, etc., are inseparable from the application of lithium-ion batteries. However, metal lithium resources are limited, and the consumption of a large amount of lithium has made lithium resources increasingly scarce. Metal sodium and lithium are elements of the same family and have similar charge-discharge properties and physical and chemical properties. On the other hand, metal sodium has far more reserves on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/054
CPCY02E60/10
Inventor 曾令兴罗奋强程涵陈婷陈晓燕钱庆荣陈庆华黄宝铨肖荔人
Owner FUJIAN NORMAL UNIV
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