Rational design of MoS2-reduced graphene oxide sponges as free-standing anodes for sodium-ion batteries
Rational design of MoS2-reduced graphene oxide sponges as free-standing anodes for sodium-ion batteries
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MoS2还原氧化石墨烯海绵作为钠离子电池自支撑阳极的合理设计
DOI：
10.1016/j.cej.2017.09.088
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发表时间：
2018
影响因子：
15.1
通讯作者：
Mai Wenjie
中科院分区：
文献类型：
--
作者：
Li Jinliang;Qin Wei;Xie Junpeng;Lin Rui;Wang Zilong;Pan Likun;Mai Wenjie
目前，寻找高容量、低成本、独立的钠离子电池电极是储能领域面临的主要挑战之一。在这项工作中，我们通过四硫钼酸铵-氧化石墨烯混合溶液的简单冷冻干燥和随后的N2/H2atmosphere热处理，合理地设计了mos2还原氧化石墨烯（MS-RGO）海绵，并将这些海绵用作sib的独立阳极。MS-RGO海绵具有有利于电荷传输的多孔结构，具有优异的电化学性能。在100 mA g−1的电流密度下，经过50次循环后，独立海绵电极的最大可逆比容量为372.0 mAh g−1（0.49 mAh cm−2）。即使在1a g−1的高电流密度下，在345次循环后仍能保持192.2 mAh g−1（0.25 mAh cm−2）的容量。结果表明，MS-RGO海绵是一种很有前途的可充电sib独立电极材料。
Currently, the search for high capacity, low cost and free-standing electrodes for sodium-ion batteries (SIBs) is one of the major challenges in energy storage field. In this work, we rationally design MoS2-reduced graphene oxide (MS-RGO) sponges via a simple freeze-drying of ammonium tetrathiomolybdate-graphene oxide mixed solution and a subsequent thermal treatment in N2/H2atmosphere, and employ these sponges as free-standing anodes for SIBs. The MS-RGO sponges exhibit a porous conducive structure that can facilitate the charge transport and thus show an excellent electrochemical performance. The free-standing sponge electrodes display a maximal reversible specific capacity of 372.0 mAh g−1(0.49 mAh cm−2) at a current density of 100 mA g−1after 50 cycles. Even at a high current density of 1 A g−1, a capacity of 192.2 mAh g−1(0.25 mAh cm−2) is maintained after 345 cycles. The results show that MS-RGO sponges are promising free-standing electrode materials for rechargeable SIBs.