Department of Materials Science and Engineering, Korea University , Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea.
Department of Chemical Engineering, Konkuk University , 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Republic of Korea.
ACS Appl Mater Interfaces. 2016 Aug 24;8(33):21343-9. doi: 10.1021/acsami.6b05758. Epub 2016 Aug 11.
Transition-metal telluride materials are studied as the anode materials for Na-ion batteries (NIBs). The FeTe2-reduced graphene oxide (rGO) hybrid powders (first target material) are prepared via spray pyrolysis and subsequent tellurization. The H2Te gas treatment transforms the Fe3O4-rGO powders to FeTe2-rGO hybrid powders with FeTe2 nanocrystals (various sizes <100 nm) embedded within the rGO. The FeTe2-rGO hybrid powders contain 5 wt % rGO. The Na-ion storage mechanism for FeTe2 in NIBs is described by FeTe2 + 4Na(+) + 4e(-)↔Fe + 2Na2Te. The FeTe2-rGO hybrid discharge process forms metallic Fe nanocrystals and Na2Te by a conversion reaction of FeTe2 with Na ions. The discharge capacities of the FeTe2-rGO hybrid powders for the first and 80th cycles are 493 and 293 mA h g(-1), respectively. The discharge capacities of the bare FeTe2 powders for the first and 80th cycles are 462 and 83 mA h g(-1), respectively. The FeTe2-rGO hybrid powders have superior Na-ion storage properties compared to bare FeTe2 powders owing to their high structural stability and electrical conductivity.
过渡金属碲化物材料被研究作为钠离子电池（NIBs）的阳极材料。通过喷雾热解和随后的碲化作用制备了 FeTe2-还原氧化石墨烯（rGO）杂化粉末（第一目标材料）。H2Te 气体处理将 Fe3O4-rGO 粉末转化为 FeTe2-rGO 杂化粉末，其中嵌入 rGO 中的 FeTe2 纳米晶体（各种尺寸 <100nm）。FeTe2-rGO 杂化粉末含有 5wt%rGO。FeTe2 在 NIBs 中的钠离子存储机制通过 FeTe2 + 4Na(+) + 4e(-)↔Fe + 2Na2Te 来描述。FeTe2-rGO 杂化放电过程通过 FeTe2 与 Na 离子的转化反应形成金属 Fe 纳米晶体和 Na2Te。FeTe2-rGO 杂化粉末在前 80 个循环中的放电容量分别为 493 和 293 mA h g(-1)。裸 FeTe2 粉末在前 80 个循环中的放电容量分别为 462 和 83 mA h g(-1)。与裸 FeTe2 粉末相比，FeTe2-rGO 杂化粉末具有更高的钠离子存储性能，这归因于其高结构稳定性和电导率。
