Wang Jue, Wang Bin, Liu Zhaomeng, Fan Ling, Zhang Qingfeng, Ding Hongbo, Wang Longlu, Yang Hongguan, Yu Xinzhi, Lu Bingan
School of Physics and Electronics State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 P. R. China.
Physics and Electronic Engineering Department Xinxiang University Xinxiang 453003 P. R. China.
Adv Sci (Weinh). 2019 Jun 18;6(17):1900904. doi: 10.1002/advs.201900904. eCollection 2019 Sep 4.
Potassium-ion batteries (KIBs) are one of the most appealing alternatives to lithium-ion batteries, particularly attractive in large-scale energy storage devices considering the more sufficient and lower cost supply of potassium resources in comparison with lithium. To achieve more competitive KIBs, it is necessary to search for anode materials with a high performance. Herein, the bimetallic oxide SbMoO, with the presence of reduced graphene oxide, is reported as a high-performance anode material for KIBs in this study, achieving discharge capacities as high as 402 mAh g at 100 mA g and 381 mAh g at 200 mA g, and reserving a capacity of 247 mAh g after 100 cycles at a current density of 500 mA g. Meanwhile, the potassiation/depotassiation mechanism of this material is probed in-depth through the electrochemical characterization, operando X-ray diffraction, transmission electron microscope, and density functional theory calculation, successfully unraveling the nature of the high-performance anode and the functions of Sb and Mo in SbMoO. More importantly, the phase development and bond breaking sequence of SbMoO are successfully identified, which is meaningful for the fundamental study of metal-oxide based electrode materials for KIBs.
钾离子电池（KIBs）是锂离子电池最具吸引力的替代品之一，考虑到与锂相比钾资源供应更充足且成本更低，在大规模储能设备中尤其具有吸引力。为了实现更具竞争力的钾离子电池，有必要寻找高性能的负极材料。在此，本研究报道了一种含有还原氧化石墨烯的双金属氧化物SbMoO，作为钾离子电池的高性能负极材料，在100 mA g时放电容量高达402 mAh g，在200 mA g时为381 mAh g，在500 mA g的电流密度下循环100次后仍保留247 mAh g的容量。同时，通过电化学表征、原位X射线衍射、透射电子显微镜和密度泛函理论计算深入探究了该材料的钾化/脱钾化机制，成功揭示了高性能负极的本质以及Sb和Mo在SbMoO中的作用。更重要的是，成功确定了SbMoO的相演变和键断裂顺序，这对于基于金属氧化物的钾离子电池电极材料的基础研究具有重要意义。
