Graphene and Carbon Nanotube Dual-Decorated SiOx Composite Anode Material for Lithium-Ion Batteries
Graphene and Carbon Nanotube Dual-Decorated SiOx Composite Anode Material for Lithium-Ion Batteries
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DOI：
10.1021/acs.energyfuels.1c02967
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发表时间：
2021-11
期刊：
影响因子：
5.3
通讯作者：
Junying Zhang;Gen Yang;Jin-Ao Wang;Z. Hou;Xiaoming Zhang;Chuanbo Li
中科院分区：
文献类型：
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作者：
Junying Zhang;Gen Yang;Jin-Ao Wang;Z. Hou;Xiaoming Zhang;Chuanbo Li
在这项研究中，三维石墨烯和碳纳米管（CNT）修饰的SiOx-Gr-CNT复合材料（SiOx-Gr-CNT）的合成。采用简单的高能球磨一步法引入双碳组分。相应的SiOx-Gr-CNT复合电极表现出上级的储锂性能，因为石墨烯和CNT组分在SiOx上形成具有高导电性的柔性网络。这种网络结构有利于提高SiO_2颗粒的导电性。石墨烯和CNT组分的机械柔性具有可忽略的体积效应，这可以有效地抑制SiOx的体积膨胀，并通过将SiOx颗粒与电解质分离而有助于形成耐用的固体电解质界面膜。因此，相应的SiOx-Gr-CNT复合电极的电化学性能得到有效提高，具有1015.1 mA h g-1的大的可逆比容量，在100 mA g-1的电流密度下循环100次后仍保持在1046.6 mA h g-1，容量保持超过100%。SiOx-Gr-CNT复合电极在1 A g-1的大电流密度下循环200次，可逆比容量仍大于800 mA h g-1。本发明制备SiOx-Gr-CNT复合负极材料的方法简单，易于批量生产，具有良好的实际应用前景。
In this study, a three-dimensional graphene- and carbon nanotube (CNT)-decorated SiOxcomposite material (SiOx-Gr-CNT) was synthesized. The dual carbon components were introduced by a simple one-step method of high-energy ball milling. The corresponding SiOx-Gr-CNT composite electrode exhibited superior lithium storage performance because the graphene and CNT components form a flexible network with high conductivity decorating on SiOx. The network is beneficial for the improvement of the conductivity of SiOxparticles. The mechanical flexibility of the graphene and CNT components had a negligible volume effect, which could effectively suppress the volume expansion of SiOxand assist to form a durable solid electrolyte interphase film by separating SiOxparticles from the electrolyte. Thus, the electrochemical properties of the corresponding SiOx-Gr-CNT composite electrode were effectively enhanced with a large reversible specific capacity of 1015.1 mA h g–1, which was maintained at 1046.6 mA h g–1after cycling of 100 cycles with a capacity remaining exceeding 100% under a current density of 100 mA g–1. The SiOx-Gr-CNT composite electrode also exhibited outstanding cycling performance under a large current density of 1 A g–1with more than 800 mA h g–1reversible specific capacity even after 200 cycles. The method used for the combination of the SiOx-Gr-CNT composite anode material is simple and mass productive and thus is promising for practical application.