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Flake NiXP/Ni negative electrode material for sodium-ion battery and preparation method of flake NiXP/Ni negative electrode material

A sodium ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of harming human health, high cost, high temperature, etc., and achieve the effects of improving cycle life, good electrical contact performance, and alleviating volume effect

Active Publication Date: 2017-06-13
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the use of white phosphorus as a phosphorus source in the process of preparing phosphides from white phosphorus and metal elements is toxic and endangers human health.
And the method that adopts pyrolysis transition metal hypophosphite needs higher temperature, and cost is higher

Method used

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  • Flake NiXP/Ni negative electrode material for sodium-ion battery and preparation method of flake NiXP/Ni negative electrode material
  • Flake NiXP/Ni negative electrode material for sodium-ion battery and preparation method of flake NiXP/Ni negative electrode material
  • Flake NiXP/Ni negative electrode material for sodium-ion battery and preparation method of flake NiXP/Ni negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Take 0.15 g of red phosphorus, put it into a steel reaction kettle, then put it into a round nickel foam, fill it with an argon atmosphere, and seal the reaction kettle. The steel reaction kettle was put into a muffle furnace and heated to 400°C, and kept for 3 hours, then cooled to room temperature, and the nickel foam was taken out. The electrode preparation method, battery assembly and test conditions are the same as those of the comparative example. The inclusion of Ni, NiP can be confirmed by X-ray diffraction characterization 2 and Ni 5 P 4 crystals, synthesized Ni X P / Ni composite material. Electrochemical performance test shows that the first discharge capacity is 0.6mAh / cm 2 , the discharge capacity after 60 cycles is 0.2 mAh / cm 2 , The capacity retention rate was 33.3%. It shows that in the sealed state, the red phosphorus in the gas phase reacts fully with the nickel foam matrix, and the discharge capacity is significantly improved.

Embodiment 2

[0020] Example 2: Take 0.15 g of red phosphorus, put it into a steel reaction kettle, then put it into a circular nickel foam in turn, fill it with an argon atmosphere, and seal the reaction kettle. Put the steel reaction kettle into the muffle furnace and heat it to 500°C, then keep it warm for 5 hours, then cool it down to room temperature, and take out the nickel foam. The electrode preparation method, battery assembly and test conditions are the same as those of the comparative example. The inclusion of Ni, NiP can be confirmed by X-ray diffraction characterization 2 and Ni 5 P 4 crystals, synthesized Ni X P / Ni composite material. Electrochemical performance test shows that the first discharge capacity is 0.72mAh / cm 2 , the capacity after 60 cycles is 0.28 mAh / cm 2 , The capacity retention rate is 70.5%. It shows that in the airtight state, the increase of temperature and the increase of holding time promote the reaction of red phosphorus in the gas phase state and ...

Embodiment 3

[0024] Example 3: Take 0.15 g of red phosphorus and put it into a steel reaction kettle, then put it into a circular nickel foam in turn, fill it with an argon atmosphere, and seal the reaction kettle. Put the steel reaction kettle into a muffle furnace and heat it to 600°C, then keep it warm for 7 hours, then cool it down to room temperature, and take out the nickel foam. The electrode preparation method, battery assembly and test conditions are the same as those of the comparative example. The inclusion of Ni, NiP can be confirmed by X-ray diffraction characterization 2 and Ni 5 P 4 crystal, synthesized Ni X P / Ni composite material. Electrochemical performance test shows that the first discharge capacity is 0.50mAh / cm 2 , the capacity after 60 cycles is 0.15 mAh / cm 2 , The capacity retention rate is 30%. If the temperature is too high and the time is too long, the material will be agglomerated, and the electrical contact effect between the formed phosphide and the foa...

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Abstract

The invention adopts a vapor phase method. Red phosphorus is heated in a low-temperature closed space to form phosphorus steam, and is subjected to in-situ chemical reaction with commercial porous nickel foam, and then a flake NiXP / Ni composite material is formed on the surface of a nickel foam substrate. X-ray diffraction characterization proves characteristic peaks comprising simple substances Ni, NiP2 and Ni5P4. According to the method, the NiXP / Ni (X is smaller than 1.25 and greater than 0.5) composite material employing the nickel foam as the substrate is obtained. Scanning electron microscope characterization proves that a flake structure of which the mean thickness is 20nm vertically grows on the porous mesh nickel foam substrate. Through the structure, the electric contact performance is strengthened, vertical spaces of which the mean size is 10 microns are formed among the flake structures, a sodium ion diffusion channel is formed by the shape and form and the sodium ion diffusion path is shortened. An electrochemical performance test proves that the first discharge capacity is 0.72mAh / cm<2> and the capacity retention after 60 cycles is kept at 0.28mAh / cm<2>.

Description

technical field [0001] The invention relates to a sheet-shaped sodium ion battery Ni X The invention discloses a P / Ni negative electrode material and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] Since lithium-ion batteries have been successfully commercialized, lithium-ion batteries have been widely used in electronic mobile devices such as mobile phones and notebook computers, and in small electric vehicles because of their significant advantages such as long life, high capacity, and high energy density. Also received much attention. However, with the use of renewable energy such as wind and solar energy, the development of large-scale energy storage systems is urgently needed, and the disadvantages of lithium-ion batteries have gradually become apparent. The limited reserves of lithium resources make the cost higher, which limits its application in large-scale energy storage systems. [0003] Sodium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/66H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/5805H01M4/661H01M10/054Y02E60/10
Inventor 李涛梅雨杨学林吴璇
Owner CHINA THREE GORGES UNIV
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