Germanium based sulfides are potentially attractive as anode material for sodium ion batteries but rarely investigated. Herein, we firstly investigated Na^＋storage properties of pristine Cu2GeS3（PCGS） and found an ...Germanium based sulfides are potentially attractive as anode material for sodium ion batteries but rarely investigated. Herein, we firstly investigated Na^＋storage properties of pristine Cu2GeS3（PCGS） and found an effective strategy to improve its performance by a single lithiation/delithiation cycle obtaining ultrafine nanoparticle copper germanium sulfide（NCGS）. The lithiation/delithiation process leads to the formation of a stable Li-containing solid electrolyte interphase film and a significant improvement of sodiation kinetics. Therefore, the NCGS anode delivers favorable capacity retention and better rate capability compared with that of a PCGS whether in the half cell or in the full cell,showing great promise for energy storage application.展开更多
基金National Natural Science Foundation of China (51502319)Shandong Provincial Natural Science Foundation (BS2015CL014)the Think-Tank Mutual Fund of Qingdao Energy Storage Industry Scientific Research and Qingdao Key Lab of Solar Energy Utilization and Energy Storage Technology
文摘Germanium based sulfides are potentially attractive as anode material for sodium ion batteries but rarely investigated. Herein, we firstly investigated Na^＋storage properties of pristine Cu2GeS3（PCGS） and found an effective strategy to improve its performance by a single lithiation/delithiation cycle obtaining ultrafine nanoparticle copper germanium sulfide（NCGS）. The lithiation/delithiation process leads to the formation of a stable Li-containing solid electrolyte interphase film and a significant improvement of sodiation kinetics. Therefore, the NCGS anode delivers favorable capacity retention and better rate capability compared with that of a PCGS whether in the half cell or in the full cell,showing great promise for energy storage application.
