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Preparation method for sodium base double-ion battery on the basis of carbon fiber negative electrode material

A carbon fiber material and negative electrode material technology, which is applied in the field of sodium-based dual-ion batteries, can solve the problems that cannot be used as sodium-ion batteries and sodium-based dual-ion batteries, and cannot achieve effective de-intercalation, etc., and achieves simple and feasible experimental operation process. repeatable effect

Inactive Publication Date: 2019-06-18
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, when graphite is used as an anode material for Na-ion batteries, Na + effective de-embedding
Therefore, general graphite materials cannot be used as anode materials for sodium-ion batteries and sodium-based dual-ion batteries. It is of great significance to find suitable anode materials for dual-ion batteries to construct sodium-based dual-ion batteries with high energy density and high cycle life.

Method used

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  • Preparation method for sodium base double-ion battery on the basis of carbon fiber negative electrode material
  • Preparation method for sodium base double-ion battery on the basis of carbon fiber negative electrode material
  • Preparation method for sodium base double-ion battery on the basis of carbon fiber negative electrode material

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Embodiment 1

[0031] Measure 10mL DMF (N, N-dimethylformamide) into a beaker, weigh 1.25g PAN (polyaniline) and add it slowly, stir until transparent and viscous, then place it in a 10mL syringe for electrospinning , Spinning parameters: Positive pressure: 15~16 kV, receiving distance: 17cm, injection speed: 0.3mm min -1 . After the spinning is completed, it is placed in an oven for 70 o C drying, followed by air at 230 o C annealed for 3 h with a heating rate of 2 o C min -1 , followed by placing the sample in nitrogen at 720 o C annealing 1h, heating rate is 2 o C min -1 . The obtained sample is the carbon fiber material. figure 1 It is the SEM picture of carbon fiber material. It can be seen that the diameter of this carbon fiber is about 200~300 nm, and the carbon fibers are interlaced to form a network structure. figure 2 It is the XRD pattern of carbon fiber material, it can be confirmed that it has a typical amorphous structure. Carbon fiber powder and PVDF (polyvinyliden...

Embodiment 2

[0033] Measure 10mL of DMF (N, N-dimethylformamide) into a beaker, weigh 1.25g of PAN (polyaniline) and add it slowly, stir until transparent and viscous, then place in a 10mL syringe for electrospinning , Spinning parameters: Positive pressure: 15~16 kV, receiving distance: 17cm, injection speed: 0.3 mm min -1 . After the spinning is completed, it is placed in an oven for 70 o C drying, followed by air at 230 oC annealed for 3 h with a heating rate of 2 o Cmin -1 , followed by placing the sample in nitrogen at 720 o C annealing 2h, heating rate is 2 o Cmin -1 . The obtained sample is the carbon fiber material. like Figure 9 In order to prepare the SEM image of the carbon fiber material, when at 720 o After C annealing for 2h, the carbon fiber material appeared to be disconnected. Assemble it with a graphite positive electrode to form a sodium-based dual-ion battery. The mass ratio of positive and negative active materials is 3:1, and the voltage window is 1-4.8 V ...

Embodiment 3

[0035] Measure 10mL of DMF (N, N-dimethylformamide) into a beaker, weigh 1.25g of PAN (polyaniline) and add it slowly, stir until transparent and viscous, then place in a 10mL syringe for electrospinning , Spinning parameters: Positive pressure: 15~16 kV, receiving distance: 17cm, injection speed: 0.3 mm min -1 . After the spinning is completed, it is placed in an oven for 70 o C drying, followed by air at 230 o C annealed for 3 h with a heating rate of 2 o Cmin -1 , followed by placing the sample in nitrogen at 550 o C annealed for 2 h with a heating rate of 2 o C min -1 . The obtained sample is the carbon fiber material. like Figure 11 In order to prepare the SEM image of the carbon fiber material, when at 550 o The morphology of the carbon fiber material remains intact after C annealing for 2 h. Assemble it with a graphite positive electrode to form a sodium-based dual-ion battery. The mass ratio of positive and negative active materials is 3:1, and the voltage ...

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Abstract

A sodium-ion battery serves as a powerful replacer for a current lithium ion battery and has the advantages of low cost and stable electrochemical performance. But the output voltage (3.5Vvs Na / Na+) of a traditional sodium-ion battery is low, so that the power density and the energy density of the traditional sodium-ion battery are low so as to greatly restrict the large-scale application of the traditional sodium-ion battery. Due to the wide voltage window, the low cost, the high safety and the high energy density of a sodium base double-ion battery, the sodium-ion battery is paid more attention by researchers currently. Through an electrostatic spinning technology, a carbon fiber material is obtained, and the carbon fiber material serves as the anode material of the sodium base double-ion battery. Meanwhile, spherical graphite serves as the cathode material of the sodium base double-ion battery to assemble the sodium base double-ion battery. The carbon fiber / graphite double-ion battery has stable electrochemical performance, discharge voltage is almost 4V, and the energy density can be 160Wh kg<-1>.

Description

technical field [0001] The invention relates to a sodium-based dual-ion battery based on a carbon fiber negative electrode material, belonging to the field of dual-ion batteries. Background technique [0002] As a powerful substitute for current lithium-ion batteries, sodium-ion batteries have the advantages of low cost and stable electrochemical performance. However, the output voltage of conventional Na-ion batteries is low (<3.5 V vs Na / Na + ), resulting in low power density and energy density, which greatly limits its large-scale application. Recently, sodium-based double-ion batteries have attracted researchers' attention due to their wide voltage window, low cost, high safety, and high energy density. Sodium-based dual-ion batteries generally use sodium-ion battery electrolytes, and graphite is usually used as the cathode material. Since graphite has a typical layered structure, when the voltage is higher than 4 V, the PF in the electrolyte 6 - Capable of achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/058
CPCY02E60/10Y02P70/50
Inventor 高林王祖静杨学林
Owner CHINA THREE GORGES UNIV