A facile and versatile strategy towards high-performance Si anodes for Li-ion capacitors: Concomitant conductive network construction and dual-interfacial engineering
A facile and versatile strategy towards high-performance Si anodes for Li-ion capacitors: Concomitant conductive network construction and dual-interfacial engineering
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用于锂离子电容器的高性能硅阳极的简便且通用的策略：伴随的导电网络构建和双界面工程
DOI：
10.1016/j.nanoen.2019.06.020
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发表时间：
2019-09-01
期刊：
影响因子：
17.6
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Shao, Rong;Niu, Jin;Wang, Feng
在这项工作中，我们展示了一种高效和通用的策略，使用低成本的生物质和商业上可获得的硅纳米颗粒作为前驱体，通过传统的浆料涂层和低温热解来合成硅基阳极。由于量身定做和合理的设计，含有大量杂原子的明胶衍生碳不仅起到促进电子/离子转移的“导电骨架”的作用，而且通过“双界面键合”同时适应硅的膨胀并将硅固定在集电体上。在不添加粘结剂和导电剂的情况下，获得的硅基负极具有高的初始柱状效率(85.3%)、高的重量比容量(0.2Ag(-1)时的3160mAhg(-1))、大的面积容量(0.18 mAg(-2)时的2.81mAhcm(-2)，接近商业LiB的要求)、良好的倍率性能(5Ag(-1)时的1613mAhg(-1))和循环性能。因此，使用硅基阳极组装的锂离子电容器具有高能量密度(213Wh kg(-1))、高功率密度(22.3kW kg(-1))、低放电率和长寿命。这种可扩展的合成方法与高性能相结合，使这种硅基阳极具有很好的实际应用前景。
In this work, we demonstrate an efficiency and versatile strategy for the synthesis of Si-based anodes using low-cost biomass and commercially available Si nanoparticles as precursors via conventional slurry coating and low-temperature pyrolysis. Due to the tailored and rational design, gelatin-derived carbon with numerous heteroatoms not only acts as a "conductive skeleton" to enhance the electron/ion transfer but also simultaneously accommodate the Si expansion and immobilize the Si on the current collector via "dual-interfacial bonding". Without additional binder and conductive agents, the obtained Si-based anode exhibits high initial columbic efficiency (85.3%), high gravimetric capacity (3160 mAh g(-1) at 0.2 A g(-1)), large areal capacity (2.81 mAh cm(-2) at 0.18 mA cm(-2), approaching the commercial LIB requirement), good rate capability (1613 mAh g(-1) at 5 A g(-1)) and cycling performance. Consequently, an assembled Li-ion capacitor utilizing the Si-based anode exhibits high energy density (213 Wh kg(-1)), high power density (22.3 kW kg(-1)), low discharge rate and long lifetime. The scalable synthetic method combined with high performance making this Si-based anode promising for practical applications.