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A kind of soft and hard carbon composite porous negative electrode material for sodium ion battery and preparation method thereof

A technology for sodium ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability and reversibility of rate performance, and achieve improved rate performance, simple preparation methods, and accelerated electrons. The effect of conduction

Active Publication Date: 2022-06-24
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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  • A kind of soft and hard carbon composite porous negative electrode material for sodium ion battery and preparation method thereof
  • A kind of soft and hard carbon composite porous negative electrode material for sodium ion battery and preparation method thereof
  • A kind of 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] 60 mL of ethanolic solution of dimethylimidazole (containing 930 mg of dimethylimidazole) was added dropwise to 60 mL of ethanolic solution of cobalt nitrate (containing 100 mg of cobalt nitrate), and after rapid stirring at room temperature for 30 min, the precursor (ZIF) was obtained. -67) solution. 5g of polyvinyl alcohol was added to the precursor solution, refluxed at 85°C for 2h to form a gel, cooled naturally, freeze-dried at -60°C for 12h, and then placed in an inert gas atmosphere at 1000°C for 4h heat treatment to obtain a sodium-ion battery. Soft and hard carbon composite porous anode material. 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 the pure soft and h...

Embodiment 2

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

[0041] 60 mL of an ethanolic solution of dimethylimidazole (containing 930 mg of dimethylimidazole) was added dropwise to 60 mL of an ethanolic solution of cobalt nitrate (containing 100 mg of cobalt nitrate). The mixed solution was left standing for 24 hours, centrifuged, washed and dried to obtain the precursor ZIF-67. Then the precursor ZIF-67 was placed in a magnetic boat, heated to 600°C at a heating rate of 5°C / min, kept in a nitrogen atmosphere for 4 hours, and then soaked in 35% hydrochloric acid for 3 hours after natural cooling to remove The residual Co element on the sample is finally washed with deionized water, suction filtered, 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 peaks (002) and (101). ...

Embodiment 3

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

[0046] Dissolve 5 g of polyvinyl alcohol in 10 mL of deionized water, stir it ultrasonically for 30 min to make it evenly dispersed, and then transfer it to a single-neck round-bottomed 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 The precursor was placed in a magnetic boat, heated to 1000°C at a heating rate of 2°C / min, kept for 4h in a nitrogen atmosphere, and naturally cooled to obtain a hard carbon anode material for sodium ion batteries.

[0047] Depend on figure 1 It can be seen that the X-ray diffraction (XRD) pattern of the hard carbon anode material prepared in Example 3 shows that the hard carbon exhibits two broad diffraction peaks, indicating an amorphous structure, and the 2θ is the crystal corresponding to the peak at 22.9°. The lattice spacing of 0.4 nm, which is larger than that of soft carbon (>0.35 nm), favors ...

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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 regulated and prepared by cobalt nitrate, dimethylimidazole and polyvinyl alcohol. Its preparation method is: adding the ethanol solution of dimethylimidazole dropwise to the ethanol solution of cobalt nitrate, stirring at room temperature until the solution of precursor ZIF-67 is formed; then adding polyvinyl alcohol to the solution, and then refluxing Until the gel is formed, it is naturally cooled, freeze-dried, and then placed in an inert gas atmosphere at 700-1100° C. for 2-5 hours to obtain the negative electrode material. The composite negative electrode material prepared by the invention combines the advantages of the excellent electrical conductivity of the soft carbon and the high capacity of the hard carbon, effectively improves the stability of the battery, and improves the cycle performance and coulombic efficiency of the sodium ion battery. The raw material used in the method has stable components, simple process operation, high repeatability, and is beneficial to industrialized production.

Description

technical field [0001] The invention relates to a soft and hard carbon composite porous negative electrode material for sodium ion batteries 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, and have played an important role in smart grids, electric vehicles, personal electronic devices, and other fields. However, due to the scarcity and high safety of lithium resources, people are still looking for better alternatives [Nano Lett., 2012, 12, 3783.]. In contrast, sodium resources are cheaper 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 device...

Claims

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Application Information

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Patent Type & Authority Patents(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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