Preparation method and application of complex sodium ion battery negative material

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large volume expansion and poor conductivity, and achieve the effects of inhibiting volume expansion, improving electronic conductivity, and having a wide range of sources.

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

However, tin selenide and stannous selenide have huge volume expansion (expansion rate close to 300%) when storing sodium, and their conductivity is poor. The conventional modification method is to improve its conductivity and partially inhibit its huge volume expansion

Method used

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  • Preparation method and application of complex sodium ion battery negative material
  • Preparation method and application of complex sodium ion battery negative material
  • Preparation method and application of complex sodium ion battery negative material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Weigh 4g of chlorella and 2g of stannous chloride and add them into 0.4L of deionized water, stir for 12 hours, centrifuge, wash the precipitate and dry it in an oven at 60°C;

[0034] 2) the light green solid gained in step 1) is ground to powder, mixed with the selenium powder of 12g, in H 2 / Ar (5% / 95%) atmosphere tube furnace, calcined at 400°C for 4 hours, and collected black solid samples, which were tin selenide-stannous selenide-chlorella-derived carbon composites;

[0035] Carry out XRD to the tin selenide-stannous selenide-chlorella derived carbon complex prepared above, obtain the XRD pattern of tin selenide-stannous selenide-chlorella derived carbon complex, as figure 1 shown. From figure 1 It can be seen that the synthesized material is a mixed phase of tin selenide-snselenide two phases, and its diffraction peak position is consistent with the standard spectrum of tin selenide-snselenide (JCPDS, 089-3197; JCPDS, 048-1224) match.

[0036] The above-p...

Embodiment 2

[0039] 1) Weigh 4g of chlorella and 4g of tin chloride and add them into 0.5L of deionized water, stir for 12 hours, centrifuge, wash the precipitate and dry it in an oven at 60°C;

[0040] 2) the light green solid gained in step 1) is ground to powder, mixed with the selenium powder of 20g, in H 2 / Ar (5% / 95%) atmosphere tube furnace, calcined at 700°C for 4 hours, and collected black solid samples, which were tin selenide-stannous selenide-chlorella-derived carbon complexes;

[0041] The tin selenide-stannous selenide-chlorella-derived carbon composite prepared in this example: the conductive agent super P carbon: the binder CMC is mixed and ground according to the mass percentage of 80:10:10 and evenly coated on the copper foil The top is used as the working electrode, the metal sodium sheet is the counter electrode and the reference electrode, and 1mol / L NaPF 6 / DIGLYME assembles button cells from the electrolyte; all assemblies are performed in an inert atmosphere glove ...

Embodiment 3

[0043] 1) Weigh 10g of chlorella and 5g of stannous sulfate into 0.8L of deionized water, stir for 24 hours, centrifuge, wash the precipitate and dry it in an oven at 80°C;

[0044] 2) step 1) gained light green solid is ground to powder, mixes with the selenium powder of 60g, in H 2 / Ar (5% / 95%) atmosphere tube furnace, calcined at 600° C. for 5 hours, and collected black solid samples, which were tin selenide-stannous selenide-chlorella-derived carbon complexes;

[0045] The tin selenide-stannous selenide-chlorella-derived carbon composite prepared in this example: the conductive agent super P carbon: the binder CMC is mixed and ground according to the mass percentage of 80:10:10 and evenly coated on the copper foil The top is used as the working electrode, the metal sodium sheet is the counter electrode and the reference electrode, and 1mol / L NaPF 6 / DIGLYME assembles button cells from the electrolyte; all assemblies are performed in an inert atmosphere glove box.

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Abstract

The invention relates to a preparation method and application of a complex sodium ion battery negative material. The preparation method comprises the following steps: weighing 1-2 parts of chlorella and 1 parts of tin salt to add into deionized water according to raw material part by mass ratio, magnetically stirring and centrifuging, washing precipitate, and drying in an oven to obtain a laurel-green solid sample; grinding the solid sample as powder, mixing with 4-12 parts of selenium powder, placing in an alundum boat to calcining, thereby obtaining stannic selenide-stannous selenide-chlorella derived carbon compound; mixing and grinding the stannic selenide-stannous selenide-chlorella derived carbon compound, the conductive agent super P-carbon, and adhesive CMC, coating on the copper foil to assemble as a button cell. Through the determination, after circularly charging/discharging for 600 times at the voltage of 0.01-3.0V and the large current density of 1A/g, the specific capacity is stabilized at 300 mAh/g and more, the capacity retention ration reaches up to 85.7%; the preparation method disclosed by the invention is extensive in raw material source, low in cost, capable ofproducing in large scale and conforms to an environment requirement.

Description

technical field [0001] The invention belongs to the field of sodium-ion battery materials, and in particular relates to a preparation method and application of a composite sodium-ion battery negative electrode material composed of tin selenide-stannous selenide-chlorella with long cycle life characteristics. Background technique [0002] In the secondary energy storage system, lithium-ion batteries have received widespread attention and developed rapidly, and can be seen everywhere in our lives (portable electronic products, communication equipment, electric vehicles, etc.). However, considering the limited resources of metallic lithium, the consumption of a large amount of lithium has made lithium resources increasingly scarce, and relying solely on lithium-ion batteries can no longer meet human needs for the future. The same metal sodium, which has similar physical and chemical properties to lithium, has more abundant reserves and a similar energy storage mechanism. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/054
CPCY02E60/10
Inventor 曾令兴刘俊彬夏新曙许丽洪钱庆荣陈庆华黄宝铨肖荔人
Owner FUJIAN NORMAL UNIV
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