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Soft and hard carbon composite porous negative electrode material for sodium-ion battery and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability, reversibility of rate performance, etc., to improve rate performance, facilitate deintercalation, and large ratio The effect of capacity

Active Publication Date: 2020-06-16
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, soft carbon and hard carbon anode materials also have poor cycle stability, rate performance, reversibility, etc.

Method used

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  • Soft and hard carbon composite porous negative electrode material for sodium-ion battery and preparation method thereof
  • Soft and hard carbon composite porous negative electrode material for sodium-ion battery and preparation method thereof
  • Soft and hard carbon composite porous negative electrode material for sodium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of a soft and hard carbon composite porous negative electrode material for sodium ion batteries

[0032] The ethanol solution of 60mL of dimethylimidazole (containing 930mg of dimethylimidazole) was added dropwise to the ethanol solution of 60mL of cobalt nitrate (containing 100mg of cobalt nitrate), and after stirring rapidly at room temperature for 30min, the precursor (ZIF -67) solution. Add 5g of polyvinyl alcohol to the precursor solution, reflux at 85°C for 2h to form a gel, cool naturally, freeze-dry at -60°C for 12h, and then heat-treat at 1000°C for 4h in an inert gas atmosphere to obtain a sodium-ion battery. Soft and hard carbon composite porous anode materials. Depend on figure 1 It can be seen that the X-ray diffraction (XRD) pattern of the soft and hard carbon composite porous negative electrode material prepared in Example 1 shows that the peak shape of the composite material is between pure soft and hard carbon, indicating that the degree o...

Embodiment 2

[0040] Preparation of a soft carbon negative electrode material for sodium ion batteries

[0041] 60 mL of ethanol solution of dimethylimidazole (containing 930 mg of dimethylimidazole) was added dropwise to 60 mL of ethanol solution of cobalt nitrate (containing 100 mg of cobalt nitrate). After the mixed solution was left to stand for 24 hours, it was centrifuged, washed and dried to obtain the precursor ZIF-67. Then put the precursor ZIF-67 in a magnetic boat, raise the temperature to 600°C at a rate of 5°C / min, keep it in a nitrogen atmosphere for 4h, and soak it in 35% hydrochloric acid for 3h after natural cooling to remove The Co simple substance remaining on the sample was finally washed with deionized water, filtered with suction, and dried to obtain a soft carbon negative electrode material.

[0042] Depend on figure 1 It can be seen that the X-ray diffraction (XRD) pattern of the soft carbon negative electrode material prepared in Example 2 shows two diffraction pe...

Embodiment 3

[0045] Preparation of a hard carbon negative electrode material for sodium ion batteries

[0046] Dissolve 5 g of polyvinyl alcohol in 10 mL of deionized water, stir ultrasonically for 30 min to disperse evenly, then transfer to a single-necked round-bottom flask, reflux and stir at 85 °C for 5 h to form a gel, cool, centrifuge, and freeze-dry at -60 °C for 12 h to obtain Precursor, put the precursor in a magnetic boat, raise the temperature to 1000°C at a heating rate of 2°C / min, keep it warm for 4h in a nitrogen atmosphere, and obtain a hard carbon negative electrode material for a sodium-ion battery after natural cooling.

[0047] Depend on figure 1 It can be seen that the X-ray diffraction (XRD) pattern of the hard carbon negative electrode material prepared in Example 3 shows that the hard carbon presents two broad diffraction peaks, indicating an amorphous structure, and 2θ is the crystal corresponding to the peak at 22.9°. The lattice spacing is 0.4 nm, which is larger...

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Abstract

The invention discloses a soft and hard carbon composite porous negative electrode material for a sodium-ion battery and a preparation method thereof. The soft and hard carbon composite porous negative electrode material is prepared by regulating and controlling cobalt nitrate, dimethylimidazole and polyvinyl alcohol. The preparation method comprises the steps of dropwise adding an ethanol solution of dimethylimidazole into an ethanol solution of cobalt nitrate, and stirring at room temperature to form a precursor ZIF-67 solution; and adding polyvinyl alcohol into the solution, refluxing to form gel, naturally cooling, freeze-drying, and placing in an inert gas atmosphere at 700 to 1100 DEG C for 2 to 5 hours to obtain the negative electrode material. The composite negative electrode material prepared by the invention combines the advantages of excellent conductivity of soft carbon and high capacity of hard carbon, so that the stability of the battery is effectively improved, and the cycle performance and coulombic efficiency of the sodium-ion battery are improved. The method has the advantages of stable raw material components, simple process operation and high repeatability, andis beneficial to industrial production.

Description

technical field [0001] The invention relates to a soft and hard carbon composite porous negative electrode material for a sodium ion battery and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] In recent years, rechargeable lithium-ion batteries (LIBs) have become the mainstream of electrochemical energy storage devices due to their high energy density and long service life, playing an important role in smart grids, electric vehicles, and personal electronic devices. However, due to the scarcity and high safety of lithium resources, people are still looking for better substitutes [Nano Lett., 2012, 12, 3783.]. In contrast, sodium resources are less expensive, and rechargeable sodium-ion batteries (SIBs) have similar chemical / electrochemical properties to established lithium-ion batteries, so they can replace lithium-ion batteries (LIBs) and lead-acid batteries. For large-scale energy storage equipment [J. Electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/054
CPCH01M4/362H01M4/625H01M10/054Y02E60/10
Inventor 薛艳春张俊豪郭兴梅蔡星伟万小晗陈家乐
Owner JIANGSU UNIV OF SCI & TECH
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