High Lithium Storage Capacity and Long Cycling Life Fe3S4 Anodes with Reversible Solid Electrolyte Interface Films and Sandwiched Reduced Graphene Oxide Shells.
High Lithium Storage Capacity and Long Cycling Life Fe3S4 Anodes with Reversible Solid Electrolyte Interface Films and Sandwiched Reduced Graphene Oxide Shells.
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DOI：
10.1021/acsami.7b13558
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发表时间：
2017-11
影响因子：
9.5
通讯作者：
Yu‐Jiao Zhang;Jin Qu;Shu‐meng Hao;Wei-Yi Chang;Q. Ji;Zhongzhen Yu
中科院分区：
文献类型：
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作者：
Yu‐Jiao Zhang;Jin Qu;Shu‐meng Hao;Wei-Yi Chang;Q. Ji;Zhongzhen Yu
对具有高能量密度和高功率密度的锂离子电池（LIB）的需求增加需要高度可逆的电化学反应，以增强电极的可环性和能力。由于Fe3S4的固定/界限过程中固体电解质界面（SEI）膜的可逆形成/分解可能会带来比其理论值更高的能力，因此合成的FE3S4纳米颗粒是夹层的，含量减少了石墨烯（RGO）用于制造高性能Libs的高度可逆和长循环寿命材料。夹层RGO片之间的微米大小的长缝隙有效地防止了放电/电荷过程中中间相的聚集，因此由于FE纳米颗粒驱动的SEI膜的可逆形成/分解，因此增加了循环能力。此外，RGO板通过面对面模式相互连接，以构建更有效的导电网络，最大的界面氧桥键使从RGO到FE3S4的快速电子跳跃有益，从而改善了电化学反应的深度和电化学反应的深度促进Fe3S4的高度可逆晶石/界定。因此，最终的Fe3S4/RGO混合动力车在275个循环上以100 mA G-1的速度在275个周期上显示出高度可逆的电荷能力，甚至在1000 mA g的500个周期上保留了480 mA H G-1 -1，比报道的值高得多。
Increasing demands for lithium-ion batteries (LIBs) with high energy density and high power density require highly reversible electrochemical reactions to enhance the cyclability and capacities of electrodes. As the reversible formation/decomposition of the solid electrolyte interface (SEI) film during the lithiation/delithiation process of Fe3S4 could bring about a higher capacity than its theoretical value, in the present work, synthesized Fe3S4 nanoparticles are sandwich-wrapped with reduced graphene oxide (RGO) to fabricate highly reversible and long cycling life anode materials for high-performance LIBs. The micron-sized long slit between sandwiched RGO sheets effectively prevents the aggregation of intermediate phases during the discharge/charge process and thus increases cycling capacity because of the reversible formation/decomposition of the SEI film driven by Fe nanoparticles. Furthermore, the RGO sheets interconnect with each other by a face-to-face mode to construct a more efficiently conductive network, and the maximum interfacial oxygen bridge bonds benefit the fast electron hopping from RGO to Fe3S4, improving the depth of the electrochemical reactions and facilitating the highly reversible lithiation/delithiation of Fe3S4. Thus, the resultant Fe3S4/RGO hybrid shows a highly reversible charge capacity of 1324 mA h g-1 over 275 cycles at a current density of 100 mA g-1, even retains 480 mA h g-1 over 500 cycles at 1000 mA g-1, which are much higher than reported values.