摘要
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.
锗基硫化物作为钠离子电池负极具有潜在的吸引力,但相关报道甚少.为此,我们研究了Cu_2GeS_3(PCGS)的储钠性能,发现通过单次嵌锂/脱锂循环获得超细纳米微粒铜锗硫(NCGS)是一种改善其储钠性能的有效策略.嵌锂/脱锂过程能够在材料表面形成一层稳定的含锂固态电解质相界面膜,并提高材料的嵌钠动力学.因此,与PCGS相比,NCGS在半电池和全电池中都显示出良好的循环性能和倍率性能,在能源存储领域具有广阔的应用前景.
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
