3D flexible Si based-composite (Si@Si3N4)/CNF electrode with enhanced cyclability and high rate capability for lithium-ion batteries
3D flexible Si based-composite (Si@Si3N4)/CNF electrode with enhanced cyclability and high rate capability for lithium-ion batteries
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DOI：
10.1016/j.nanoen.2016.08.012
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发表时间：
2016-09-01
期刊：
影响因子：
17.6
通讯作者：
Park, Kyung-Won
中科院分区：
文献类型：
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作者：
Kim, Si-Jin;Kim, Min-Cheol;Park, Kyung-Won
尽管锂离子电池（LIB）中的硅基阳极具有极高的容量，但硅基材料在循环过程中由于体积膨胀/收缩而导致结构崩溃。传统的电极结构由活性材料、集流体、导电剂和粘合剂组成，由于其他重成分，实际上显示出活性材料的负载量较低。在这项研究中，我们制备了由核（Si）-壳（Si3N4）纳米颗粒（Si@Si3N4）和碳纳米纤维（表示为Si-composite/CNF）组成的3D柔性硅复合电极。在不存在其他组分的情况下，使用硬币型电池对硅复合材料/CNF 直接用作阳极进行电化学评估。 Si复合材料/CNF在10 A g(-1)的相当高的电流密度下表现出665 m Ah g(-1)的高容量，并且在2000次循环后容量损失极低。 (C) 2016 年由爱思唯尔有限公司出版。
Despite extremely high capacity of Si-based anodes in lithium-ion batteries (LIB), Si-based materials have shown a structural collapse caused by a volumetric expansion/contraction during the cycling process. The conventional electrode structure, which consists of active materials, a current collector, a conducting agent, and a binder, actually showed a low loading of active material due to the other heavy components. In this study, we prepared a 3D flexible Si-composite electrode consisting of core (Si)-shell (Si3N4) NPs (Si@Si3N4) and carbon nanofibers (denoted as Si-composite/CNF). The Si-composite/CNF was directly utilized as an anode in the absence of the other components was electrochemically evaluated using a coin-type cell. The Si-composite/CNF showed a high capacity of 665 m Ah g(-1) at a fairly high current density of 10 A g(-1) and an extremely low capacity loss for 2000 cycles. (C) 2016 Published by Elsevier Ltd.