石墨烯/Si/SiO x 纳米复合材料的制备及储锂性能研究

doi:10.19799/j.cnki.2095-4239.2023.0206

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (9): 2752-2759.doi: 10.19799/j.cnki.2095-4239.2023.0206

石墨烯/Si/SiO _x 纳米复合材料的制备及储锂性能研究

李悦¹^,²^,³(), 王博¹^,²(), 吴楠¹^,³

^1.唐山学院新材料与化学工程学院，河北唐山 063000
^2.燕山大学，亚稳材料制备技术与科学国家重点实验室，河北秦皇岛 066004
^3.唐山市水环境生态修复技术重点实验室，河北唐山 063000

收稿日期:2023-04-04 修回日期:2023-04-27 出版日期:2023-09-05 发布日期:2023-09-16
通讯作者: 王博 E-mail:gemingzhuanwa@126.com;wangbo@buaa.edu.cn
作者简介:李悦（1980—），男，硕士，高级实验师，研究方向为无机非金属材料，E-mail：gemingzhuanwa@126.com；
基金资助:
唐山市科技计划项目(22130208H);亚稳材料制备技术与科学国家重点实验室国家重点实验室开放课题(202103)

Preparation and lithium storage performance of graphene/Si/SiO _x nanocomposites

Yue LI¹^,²^,³(), Bo WANG¹^,²(), Nan WU¹^,³

^1.Department of New Materials and Chemical Engineering, Tangshan University, Tangshan 063000, Hebei, China
^2.State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
^3.Tangshan Key Laboratory of Water Ecological Restoration Technology, Tangshan 063000, Hebei, China

Received:2023-04-04 Revised:2023-04-27 Online:2023-09-05 Published:2023-09-16
Contact: Bo WANG E-mail:gemingzhuanwa@126.com;wangbo@buaa.edu.cn

摘要/Abstract

摘要：

本文以三乙氧基硅烷为原料，在氧化石墨烯悬浮液中采用原位溶胶-凝胶反应和随后的H₂/Ar气氛下热还原反应制备了石墨烯/Si/SiO _x (G//Si/SiO _x )纳米复合材料。G//Si/SiO _x 纳米复合材料中，粒径约20 nm的Si纳米粒子分布到非晶SiO _x 基体中组成粒径为100～200 nm的Si/SiO _x 纳米球随机分布在二维石墨烯片表面和层间。G//Si/SiO _x 电极独特的纳米结构能够提供快速的电子传递通道和有效缓解循环过程中Si纳米粒子体积变化，促使电极具有良好的电化学储锂性能。作为锂离子电池负极材料，G//Si/SiO _x 电极在电流密度200 mA/g下呈现出722.45 mAh/g的高初始可逆容量，300个循环后，可逆容量高达853.76 mAh/g，以及优异的倍率性能。

关键词: 锂离子电池, 石墨烯, 硅, 负极, 溶胶-凝胶反应

Abstract:

In this work, the graphene/Si/SiO _x nanocomposites (G//Si/SiO _x ) nanocomposites were synthesized. The synthesis process was done via a facile in situ sol-gel reaction of triethoxysilanein and graphene oxide suspension and a subsequent thermal reduction reaction under H₂/Ar atmospheres. The Si/SiO _x nanospheres with a 100-200 nm size were randomly distributed between two-dimensional graphene sheets in G/Si/SiO _x nanocomposites, in which crystalline Si nanodots with an approximate size of 20 nm were integrated into the amorphous SiO _x matrix. The unique G/Si/SiO _x nanostructure could provide a synergistic effect for electron transport within the electrode, accommodating the Si nanocrystals' volume variation during cycling and leading to excellent electrochemical performance. Benefiting from the unique structural features, the resulting G/Si/SiO _x electrode delivered exceptional rate performance and a high reversible specific capacity of 722.45 mAh/g at a current density of 200 mA/g, which remained at 853.76 mAh/g after 300 cycles.

Key words: lithium ion battery, graphene, silicon, anode, sol-gel reaction

中图分类号:

O 643.3

李悦, 王博, 吴楠. 石墨烯/Si/SiO _x 纳米复合材料的制备及储锂性能研究[J]. 储能科学与技术, 2023, 12(9): 2752-2759.

Yue LI, Bo WANG, Nan WU. Preparation and lithium storage performance of graphene/Si/SiO _x nanocomposites[J]. Energy Storage Science and Technology, 2023, 12(9): 2752-2759.

图/表 5

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图5

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石墨烯/Si/SiO _x 纳米复合材料的制备及储锂性能研究

Preparation and lithium storage performance of graphene/Si/SiO _x nanocomposites

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石墨烯/Si/SiO x 纳米复合材料的制备及储锂性能研究

Preparation and lithium storage performance of graphene/Si/SiO x nanocomposites

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石墨烯/Si/SiO _x 纳米复合材料的制备及储锂性能研究

Preparation and lithium storage performance of graphene/Si/SiO _x nanocomposites