Negative electrode material phosphorus-sulfur double-doped hard carbon microsphere for sodium ion battery and preparation method of negative electrode material

A sodium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve problems such as poor rate performance, capacity fading, and low discharge platform potential, and achieve good charge and discharge performance, large reversible capacity, and small capacity fading.

Inactive Publication Date: 2017-07-21
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its cycle performance is good, its rate performance is poor
The main reason is that the discharge platform potential is too low. When the current is large, due to the occurrence of polarization, the capacity of the low potential platform cannot be released, resulting in serious capacity attenuation.

Method used

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  • Negative electrode material phosphorus-sulfur double-doped hard carbon microsphere for sodium ion battery and preparation method of negative electrode material
  • Negative electrode material phosphorus-sulfur double-doped hard carbon microsphere for sodium ion battery and preparation method of negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Pour 37mL of 1 mol / L sucrose solution into a 50mL hydrothermal kettle and keep it at 190°C for 5 hours to obtain the product after hydrothermal reaction. The hydrothermal product was washed and dried, and then kept in a tube furnace at 1000°C for 5h. After cooling down, the product was evenly mixed with elemental sulfur and elemental phosphorus at a ratio of 8:4:1, then kept in a tube furnace at 400°C for 5 hours, and the final product was obtained after cooling down.

[0021] Scanning electron microscope characterization results showed that the product was a sphere with a diameter between 3-10 μm. The product was used as a working electrode, and a high-purity sodium block was used as a counter electrode to assemble a simulated battery. The electrolyte is 1MNaClO 4 +EC / DEC (the volume ratio of EC to DEC is 1 / 1), and the battery assembly is carried out in an argon-filled dry box. The charging and discharging of the battery is carried out on the Land battery test syste...

Embodiment 2

[0023] Pour 40 mL of 0.5 mol / L sucrose solution into a 50 mL hydrothermal kettle and keep it at 190°C for 3 h to obtain the product after hydrothermal reaction. The hydrothermal product was washed and dried, and then kept in a tube furnace at 1000 °C for 5 h. After cooling down, the product was evenly mixed with elemental sulfur and elemental phosphorus at a ratio of 4:2:1, and then kept in a tube furnace at 400 °C for 3 h, and the final product was obtained after cooling down.

[0024] Scanning electron microscope characterization results showed that the product was a sphere with a diameter between 3-10 μm. The product was used as the working electrode, and the high-purity sodium block was used as the counter electrode to assemble a simulated battery. The electrolyte is 1M NaClO 4 +EC / DEC (the volume ratio of EC to DEC is 1 / 1), and the battery assembly is carried out in an argon-filled dry box. The charging and discharging of the battery is carried out on the Land battery ...

Embodiment 3

[0026] Pour 37mL of 1 mol / L sucrose solution into a 50mL hydrothermal kettle and keep it at 180°C for 5 hours to obtain the product after hydrothermal reaction. The hydrothermal product was washed and dried, and then kept in a tube furnace at 1000 °C for 5 h. After cooling down, the product was uniformly mixed with elemental sulfur and elemental phosphorus at a ratio of 4:1:1, and then kept in a tube furnace at 400 °C for 7 h, and the final product was obtained after cooling down.

[0027] Scanning electron microscope characterization results showed that the product was a sphere with a diameter between 3-10 μm. The product was used as the working electrode, and the high-purity sodium block was used as the counter electrode to assemble a simulated battery. The electrolyte is 1M NaClO 4 +EC / DEC (the volume ratio of EC to DEC is 1 / 1), and the battery assembly is carried out in an argon-filled dry box. The charging and discharging of the battery is carried out on the Land batte...

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Abstract

The invention belongs to the technical field of a sodium ion battery, and particularly relates to a negative electrode material phosphorus-sulfur double-doped hard carbon microsphere for a sodium ion battery and a preparation method of the negative electrode material. The negative electrode material for the sodium ion battery is a sucrose-based hard carbon material doped with elements sulfur and phosphorus and is an irregularly-shaped microsphere body, and the diameter of the microsphere is 3-10 micrometers. The material is prepared by hydrothermal reaction and high-temperature solid-phase reaction, metal sodium is used as a counter electrode, and in the sodium ion battery packaged from the material, the reversible capacitor of the sodium ion battery is about 340mAh/g under the current density being 30mA/g, and the specific capacity still can be maintained at (170-340)mAh/g after 3,500 circles and under a large current being 600mA/g. The electrode material has the advantages of high specific capacity, good rate performance, simple preparation method and low cost in raw material, and is applicable to a power type sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a negative electrode active material which can be used as a sodium ion battery and a preparation method thereof. Background technique [0002] Energy and the environment are two major issues facing today's society. In order to achieve sustainable development and pursue a green and environmentally friendly way of life and production, it is necessary to seek and develop new energy sources, and the development of secondary batteries is considered to be one of the solutions to the problem . Lithium-ion battery systems have been widely used due to their advantages such as high energy density, high discharge voltage, low self-discharge, long cycle life, and environmental friendliness. However, the global distribution of lithium resources is uneven and the reserves are small, and its price is expensive and its use is limited. Although the energy density of sodium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/054
CPCH01M4/364H01M4/38H01M4/583H01M10/054Y02E60/10
Inventor 周永宁洪帆
Owner FUDAN UNIV
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