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A kind of negative electrode material of lithium or sodium ion battery and preparation method thereof

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor battery rate performance, unfavorable industrial production, complicated preparation process, etc., and achieve excellent cycle life, low cost, The effect of prolonging the cycle life

Inactive Publication Date: 2020-12-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used method has a cumbersome preparation process, which is not conducive to industrial production, and the obtained metal particles are relatively large, which makes the rate performance of the battery poor. Therefore, it is necessary to provide a method that is easy to operate and suitable for large-scale industrial production. Preparation of new negative electrode materials for lithium (sodium) ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Weigh 2g of SnCl in proportion 2 2H 2 O and 2g of Zn(Ac) 2 2H 2 O and was added to 50ml of ethylene glycol solution, stirred for 1h to fully dissolve the two, and then 1.5g of glucose was added to the mixed solution as a carbon source to obtain a transparent mixed solution.

[0047] (2) Pour the obtained transparent mixed solution into a hydrothermal kettle, place it in a high-temperature oven and adjust the heating rate to 10°C / min, and after hydroheating at a temperature of 150°C for 3 hours, use water cooling to rapidly reduce it to room temperature.

[0048] (3) Filter and separate the obtained hydrothermal product to obtain a brown solid powder, then put the solid powder into 100ml of ethanol and sonicate for 10 minutes, repeatedly wash and filter three times, then put the solid powder into an oven to dry for 8 hours use.

[0049] (4) Finally, put the obtained solid powder into an Ar-protected high-temperature resistance furnace, maintain a heating rate of...

Embodiment 2

[0053] (1) Weigh 2g of Bi(NO) in proportion 3 ·5H 2 O and 4g of Al(NO) 3 9H 2 O and join in the ethylene glycol solution of 70ml, stir 1h to make both fully dissolved, then add 3g glucose as carbon source in the mixed solution, obtain transparent mixed solution.

[0054] (2) Pour the obtained transparent mixed solution into a hydrothermal kettle, place it in a high-temperature oven, and adjust the heating rate to 10°C / min. After hydroheating at a temperature of 160°C for 5 hours, use water cooling to rapidly reduce it to room temperature.

[0055] (3) Filter and separate the obtained hydrothermal product to obtain a brown solid powder, then put the solid powder into 100ml of ethanol and ultrasonicate for 20 minutes, repeatedly wash and filter three times, then put the solid powder into an oven to dry for 8 hours use.

[0056] (4) Finally, put the obtained solid powder into 2 In a protected high-temperature resistance furnace, maintain a heating rate of 6° C. / min, and cal...

Embodiment 3

[0060] (1) Weigh 2g of CoCl in proportion 2 ·6H 2 O and 5 g GaCl 3 and were added to 70ml of ethylene glycol solution, stirred for 1h to fully dissolve the two, and then 5g of glucose was added to the mixed solution as a carbon source to obtain a transparent mixed solution.

[0061] (2) Pour the obtained transparent mixed solution into a hydrothermal kettle, place it in a high-temperature oven and adjust the heating rate to 10°C / min, and after hydroheating at a temperature of 180°C for 5 hours, use water cooling to rapidly reduce it to room temperature.

[0062] (3) Filter and separate the obtained hydrothermal product to obtain a brown solid powder, then put the solid powder into 200ml of ethanol and ultrasonicate for 20min, wash and filter three times repeatedly, then put the solid powder into an oven to dry for 10h use.

[0063] (4) Finally, put the obtained solid powder into a high-temperature resistance furnace protected by He, maintain a heating rate of 8°C / min, and ...

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Abstract

The invention relates to a lithium or sodium ion battery anode material and a preparation method thereof. The lithium or sodium ion battery anode material takes an amorphous hollow carbon sphere as askeleton, metal elements are uniformly embedded in the carbon skeleton, and nanometal / carbon composite particles of which the particle size is 100 to 500 nm are formed; the nanometal / carbon compositeparticles are prepared from the following components in percentage by mass: 40 to 70 percent of amorphous carbon and 30 to 60 percent of metal A, wherein the particle size of the metal A is 3 to 10 nm. According to the lithium or sodium ion battery anode material disclosed by the invention, the problem of low specific capacity of a common carbon material can be solved, and meanwhile, the defect ofsevere volume change of a metal material during a charging-discharging process is also remedied; when a product designed and prepared by the method is used, better cycling stability and better rate performance are shown; the product is reasonable in structural design and simple and controllable in preparation technology, and the obtained product is good in performance and convenient for industrial production and application; the obtained product has good specific capacity, good rate performance and longer cycling service life.

Description

technical field [0001] The invention relates to the field of preparation of new energy materials, in particular to a lithium or sodium ion battery negative electrode material and a preparation method thereof. [0002] technical background [0003] Lithium-ion batteries have been widely used in portable electronic products, new energy vehicles and large-scale energy storage power station systems due to their high cycle stability and service life. At present, the negative electrode material used in commercial lithium-ion batteries is graphite. Although graphite has stable cycle performance, it is limited by its low discharge specific capacity (372mAh g -1 ). With the increasing demand for new energy batteries, the development of new electrode materials to improve battery cycle performance has become the key to the development of new lithium-ion batteries. [0004] Some metals have a lower alloying potential with lithium, forming alloy compounds (Li 4.4 Sn, Li 3 Bi, Li x Zn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 田忠良赖延清赵泽军辛鑫杨凯宗传鑫李劼
Owner CENT SOUTH UNIV