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Synthesis method and application of hard carbon coated sodium ion battery nano composite material

A nanocomposite material, sodium-ion battery technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of poor battery cycle and rate performance, low conductivity, etc., and achieve convenient operation. , the effect of mild reaction conditions and high reversible capacity

Pending Publication Date: 2022-04-08
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a synthesis method and application of a hard carbon-coated sodium-ion battery nanocomposite material to solve the problem of pure NaTi 2 (PO 4 ) 3 Material Na + Disadvantages of low conductivity, poor battery cycle and rate performance

Method used

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  • Synthesis method and application of hard carbon coated sodium ion battery nano composite material
  • Synthesis method and application of hard carbon coated sodium ion battery nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 0.005mol of LiNO 3 , 0.095mol NaNO 3 , 0.3mol of NH 4 h 2 PO 4 Dissolve in deionized water respectively, mix and stir.

[0035] (2) Take 0.205mol of Ti(OC 4 h 9 ) 4 Add an appropriate amount of ethanol drop by drop using a rubber dropper and stir.

[0036] (3) Add the solution in (2) to step (1) dropwise.

[0037] (4) Weigh 0.005mol of sodium lignosulfonate, add to step (3) and stir at 65°C for 120min.

[0038] (5) Transfer the mixture in step (4) to a hydrothermal reaction kettle and keep it at 120°C for 36h.

[0039] (6) Take out the mixture in step (5), put it into a beaker, dry it in an oven at 70°C, and then grind it into powder to obtain a precursor.

[0040] (7) Under the protection of argon atmosphere, the precursor obtained in step (6) was kept at 350°C for 240 minutes, continued to heat up to 650°C, kept at 600 minutes, and naturally cooled to room temperature to obtain Li 1-X NaxTi 2 (PO 4 ) 3 / NaTi 2 (PO 4 ) 3 nanocomposites.

[0...

Embodiment 2

[0049] (1) Weigh 0.005mol of LiNO 3 , 0.095mol NaNO 3 , 0.3mol of NH 4 h 2 PO 4 Dissolve in deionized water respectively, mix and stir.

[0050] (2) Take 0.205mol of Ti(OC 4 h 9 ) 4 Add an appropriate amount of ethanol drop by drop using a rubber dropper and stir.

[0051] (3) Add the solution in (2) to step (1) dropwise.

[0052] (4) Weigh 0.005mol of sodium lignosulfonate, add to step (3) and stir at 65°C for 120min.

[0053] (5) Transfer the mixture in step (4) to a hydrothermal reaction kettle and keep it at 120°C for 36h.

[0054] (6) Take out the mixture in step (5), put it into a beaker, dry it in an oven at 70°C, and then grind it into powder to obtain a precursor.

[0055] (7) Under the protection of argon atmosphere, the precursor obtained in step (6) is kept at 350°C for 240min, then heated to 750°C, kept at 600min, and naturally cooled to room temperature to obtain Li 1-X NaxTi 2 (PO 4 ) 3 / NaTi 2 (PO 4 ) 3 composite material.

[0056] figure 1 L...

Embodiment 3

[0064] (1) Weigh 0.005mol of LiNO 3 , 0.095mol NaNO 3 , 0.3mol of NH 4 h 2 PO 4 Dissolve in deionized water respectively, mix and stir.

[0065] (2) Take 0.205mol of Ti(OC 4 h 9 ) 4 Add an appropriate amount of ethanol drop by drop using a rubber dropper and stir.

[0066] (3) Add the solution in (2) to step (1) dropwise.

[0067] (4) Weigh 0.005mol of sodium lignosulfonate, add to step (3) and stir at 65°C for 120min.

[0068] (5) Transfer the mixture in step (4) to a hydrothermal reaction kettle and keep it at 120°C for 36h.

[0069] (6) Take out the mixture in step (5), put it into a beaker, dry it in an oven at 70°C, and then grind it into powder to obtain a precursor.

[0070] (7) Under the protection of argon atmosphere, the precursor obtained in step (6) was kept at 350°C for 240 minutes, then heated to 850°C, kept at 600 minutes, and naturally cooled to room temperature to obtain Li 1-X NaxTi 2 (PO 4 ) 3 / NaTi 2 (PO 4 ) 3 composite material.

[0071] ...

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Abstract

The invention relates to a synthesis method and application of a hard carbon coated sodium ion battery nano composite material, and belongs to the field of sodium battery materials. According to the technical scheme, the preparation method comprises the following steps: weighing LiNO3, NaNO3 and NH4H2PO4 according to a stoichiometric ratio, respectively dissolving the LiNO3, the NaNO3 and the NH4H2PO4 in deionized water, and mixing; ti (OC4H9) 4 is taken according to the stoichiometric ratio and added into a proper amount of ethyl alcohol to be stirred; adding an ethanol solution into the mixed solution of the Li salt and the Na salt, and mixing; adding a proper amount of carbon source and stirring; transferring the mixture into a hydrothermal reaction kettle for heat preservation; drying the mixture in an oven at 70 DEG C, and grinding the mixture into powder to obtain a precursor; and carrying out heat preservation on the precursor for a certain time under gas protection, then heating to high temperature treatment, carrying out heat preservation for a certain time, and naturally cooling to room temperature to obtain the nano composite material. The sodium-ion battery negative electrode material prepared by the method is high in reversible capacity and good in rate cycle performance.

Description

technical field [0001] The invention relates to a synthesis method and application of a hard carbon-coated sodium ion battery nanocomposite material, belonging to the field of sodium battery materials. Background technique [0002] Due to the scarcity of lithium resources and the increasing demand for lithium batteries year by year, the price of lithium has risen rapidly. People have to seek new alternatives, and sodium-ion batteries have entered people's field of vision because of their low cost and abundant sodium resources. [0003] Since the radius of Na is larger than that of Li, it is particularly critical to find suitable Na energy storage electrodes with large interstitial spaces. NaTi with NASICON structure 2 (PO 4 ) 3 Large theoretical capacity and excellent safety performance, but pure NaTi 2 (PO 4 ) 3 Material Na + Low conductivity leads to poor battery cycle and rate performance, and the main solutions at present are to reduce crystal size, dope metal i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054C01B25/45B82Y30/00
CPCY02E60/10
Inventor 吴洪露薛娟娟周会王勇
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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