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Nitrogen-selenium co-doped porous carbon sphere, sodium ion battery negative electrode material, and preparation methods and applications thereof

A sodium ion battery and negative electrode material technology, applied in the field of materials science, can solve the problems of reducing cycle stability, limiting material application, poor material conductivity, etc., and achieves easy large-scale industrial production, increasing active sites, and increasing contact area Effect

Pending Publication Date: 2021-03-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some articles on SIBs electrodes have been published, many materials have poor electrical conductivity and are prone to pulverization during charge and discharge, which reduces cycle stability, which limits the application of these materials.

Method used

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  • Nitrogen-selenium co-doped porous carbon sphere, sodium ion battery negative electrode material, and preparation methods and applications thereof
  • Nitrogen-selenium co-doped porous carbon sphere, sodium ion battery negative electrode material, and preparation methods and applications thereof
  • Nitrogen-selenium co-doped porous carbon sphere, sodium ion battery negative electrode material, and preparation methods and applications thereof

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preparation example Construction

[0030] A method for preparing nitrogen-selenium co-doped porous carbon spheres provided by the present invention specifically comprises the following steps:

[0031] Step S1, dissolving F127 and dopamine hydrochloride in a mixed solution of water and ethanol, stirring until the solution is clear, then adding mesitylene and stirring, and then adding ammonia water to obtain a black solution.

[0032] Step S2, mixing and stirring the black solution and ethanol at a volume ratio of 1:1-1:4, centrifuging, and taking out the lower sediment.

[0033] Step S3, calcining the precipitate at 300° C.-900° C. under an inert atmosphere, and cooling to obtain a powder, namely nitrogen-doped porous carbon spheres.

[0034] Step S4, under an inert atmosphere, place selenium powder and nitrogen-doped porous carbon spheres on both ends of the porcelain boat respectively, keep warm at 300°C-600°C for a period of time, and cool to obtain the final product, that is, black powdery nitrogen-selenium ...

Embodiment 1

[0043] The invention provides a method for preparing a negative electrode energy storage material of a sodium ion battery, which specifically includes the following steps:

[0044] Step S1, dissolve 2g of F127 and 1g of dopamine hydrochloride in 200mL of a mixed solution of water and ethanol at a ratio of 1:1, stir at 35°C for 30min until the solution is clear; then add 3mL of mesitylene and stir for 30min, then add 10mL of 25% Ammonia was stirred for 30 min, and finally a black solution was obtained.

[0045] Step S2, mix the black solution and ethanol at a volume ratio of 1:2, stir, centrifuge at 16,000 rpm for 5 min, and take out the lower sediment.

[0046] Step S3, heating the lower precipitate to 800°C for calcination under a nitrogen atmosphere at a heating rate of 3°C / min, keeping it for 2 hours, cooling to room temperature and collecting powder to obtain nitrogen-doped porous carbon spheres.

[0047] Step S4, preparing porous carbon spheres co-doped with nitrogen and...

Embodiment 2

[0053] The invention provides a method for preparing a negative electrode energy storage material of a sodium ion battery, which specifically includes the following steps:

[0054] Step S1, dissolve 3g of F127 and 1.5g of dopamine hydrochloride in 250mL of a mixed solution of water and ethanol at a ratio of 1:1, stir at 35°C for 40min until the solution is clear; then add 3ml of mesitylene and stir for 40min, then add 10ml of % ammonia water was stirred for 40min, and finally a black solution was obtained.

[0055] Step S2, mix the black solution and ethanol at a volume ratio of 1:3, stir, centrifuge at 15,000 rpm for 5 min, and take out the lower sediment.

[0056] In step S3, the lower precipitate is then heated to 800° C. for calcination under a nitrogen atmosphere at a heating rate of 3° C. / min, kept for 2 hours, and cooled to room temperature to collect powder to obtain nitrogen-doped porous carbon spheres.

[0057] Step S4, preparing porous carbon spheres co-doped with ...

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Abstract

The invention belongs to the technical field of material science, and provides a nitrogen-selenium co-doped porous carbon sphere, a sodium ion battery negative electrode material, a preparation methodand applications thereof. The method comprises the steps of dissolving F127 and dopamine hydrochloride in a mixed solution of water and ethanol to obtain a structure adopting a block copolymer F127 as a template, removing impurities through ethanol centrifugation washing to obtain the porous structure taking dopamine as a skeleton; calcining the precipitate, and carbonizing to obtain the nitrogen-doped porous carbon sphere; respectively placing the nitrogen-doped porous carbon sphere and selenium powder at the two ends of a porcelain boat, and calcining to obtain the nitrogen-selenium co-doped porous carbon sphere; and preparing the porous material into the battery negative electrode material, and applying the battery negative electrode material to a sodium ion battery to obtain the sodium ion battery. According to the present invention, selenium is deposited on a three-dimensional framework constructed by the porous carbon sphere, so that sodium ions have better cycle performance andrate capability under the porous framework, and metal selenium serving as a real commercial stable negative electrode material is pushed forwards by one step.

Description

technical field [0001] The invention belongs to the technical field of materials science, and in particular relates to a nitrogen-selenium co-doped porous carbon sphere and a negative electrode material for a sodium-ion battery, a preparation method and an application. Background technique [0002] Due to the massive increase in demand for energy storage systems, sodium-ion batteries (SIBs) are considered to be the most attractive alternatives to commercial lithium-ion batteries (LIBs) due to the wide availability and accessibility of sodium. Regrettably, low energy density, low power density, and low cycle life are still the main issues for SIBs currently pushing the entire technology forward to meet commercial benchmark requirements. In the past few years, great efforts have been made to improve the performance of SIBs, such as higher energy density and longer cycle life, by optimizing the electrode structure or electrolyte composition. Especially in the established anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/054
CPCH01M4/38H01M4/628H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 徐群杰孙唯郭康王旭闵宇霖范金辰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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