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Preparation method of sodium-ion battery negative electrode material

A technology for sodium ion batteries and negative electrode materials, applied in the field of material chemistry, can solve the problems of low discharge specific capacity and poor cycle stability of sodium ion batteries, and achieve the effects of improving structural stability, reducing loss and alleviating volume expansion.

Active Publication Date: 2020-03-27
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a kind of preparation method of sodium ion battery negative electrode material in order to overcome the discharge specific capacity of sodium ion battery is not high, poor cycle stability, the technical scheme that the present invention adopts to solve this technical problem is as follows:

Method used

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  • Preparation method of sodium-ion battery negative electrode material
  • Preparation method of sodium-ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The first step is to prepare Ni-BTC material:

[0021] Mix 20mL deionized water, 20mL absolute ethanol, 20mL N, N dimethylformamide according to volume ratio 1:1:1, add 0.6g nickel nitrate, 0.4g trimesic acid, 2.5g polyvinylpyrrolidone, stir 0.5h, ultrasonic 0.5h. After the completion, it was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle, and kept at 180°C for 18 hours. After the reaction was completed, the product was collected, washed with methanol three times, and then dried to obtain a Ni-BTC material.

[0022] The second step is to prepare NiSe / NiO material:

[0023] Mix 0.8g of Ni-BTC prepared in the first step with 0.3g of elemental selenium powder and grind evenly, place in a tube furnace, raise the temperature to 400°C at a heating rate of 2°C / min under an argon atmosphere, and keep it for 5h. After cooling with the furnace, the NiSe / NiO material is obtained.

Embodiment 2

[0025] The first step is to prepare Ni-BTC material:

[0026] Mix 15mL deionized water, 15mL absolute ethanol, 15mL N, N dimethylformamide according to volume ratio 1:1:1, add 0.5g nickel nitrate, 0.3g trimesic acid, 2g polyvinylpyrrolidone, stir for 0.5 h, ultrasonic 0.5h. After the completion, it was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and kept at 160 degrees Celsius for 12 hours. After the reaction was completed, the product was collected, washed with methanol three times, and then dried to obtain a Ni-BTC material.

[0027] The second step is to prepare NiSe / NiO material:

[0028] Mix 0.5g of the Ni-BTC material prepared in the first step with 0.2g of elemental selenium powder and grind it evenly, place it in a tube furnace, raise the temperature to 300°C at a rate of 1°C / min under an argon atmosphere, and keep it for 3h , and then cooled to obtain the NiSe / NiO material

Embodiment 3

[0030] The first step is to prepare Ni-BTC material:

[0031] Mix 30mL of deionized water, 30mL of absolute ethanol, and 30mL of N,N dimethylformamide according to the volume ratio of 1:1:3, add 1g of nickel nitrate, 0.6g of trimesic acid, and 3g of polyvinylpyrrolidone, and stir for 1h. After ultrasonication for 1 h, the product was transferred to a polytetrafluoroethylene-lined stainless steel reactor, kept at 200°C for 24 h, the product was collected, washed with methanol three times, and then dried to obtain Ni-BTC material.

[0032] The second step is to prepare NiSe / NiO material:

[0033] Mix 1 g of the Ni-BTC material prepared in the first step with 0.5 g of elemental selenium powder and grind it evenly, place it in a tube furnace, raise the temperature to 500 °C at a heating rate of 5 °C / min under an argon atmosphere, and keep it for 6 hours. After cooling, the NiSe / NiO material is obtained.

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Abstract

The invention relates to a sodium-ion battery negative electrode material preparation method, which comprises: preparing a nickel-based metal organic framework (Ni-BTC), and preparing a nickel selenide / nickel oxide (NiSe / NiO) composite sodium ion battery negative electrode material by using the nickel-based metal organic framework. Nickel selenide provides high capacity and conductivity, nickel oxide can effectively capture polyselenide generated in the charging and discharging process, loss of active substances is reduced, the hollow sphere structure can effectively relieve volume expansion generated in the charging and discharging process of the sodium ion battery, and the structural stability of the electrode is improved.

Description

technical field [0001] The invention relates to a preparation method of a high-capacity sodium-ion battery negative electrode material, in particular to a method for preparing a nickel-based metal-organic framework (Ni-BTC) and then using it to prepare nickel selenide / nickel oxide (NiSe / NiO) The invention belongs to the field of materials chemistry. Background technique [0002] Among many energy storage devices, lithium-ion batteries have rapidly become an important power source for portable electronic devices due to their high energy density and long cycle life. However, for large-scale energy storage, such as electric vehicles and related applications such as power grids, lithium-ion batteries are facing great challenges, mainly because lithium reserves are very limited (only 0.002% in the earth's crust), making lithium-ion batteries expensive , which largely restricts the large-scale application of lithium-ion batteries. Therefore, the development of new energy storage...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/58H01M10/054
CPCH01M4/523H01M4/581H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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