Park Gi Dae, Kang Yun Chan
Department of Materials Science and Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul, 136-713, Korea.
Chemistry. 2016 Mar 14;22(12):4140-6. doi: 10.1002/chem.201504398. Epub 2016 Feb 11.
A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium-ion batteries was developed. The detailed mechanism of formation of the CoSe(x)-rGO composite powders that were selected as the first target material in the spray pyrolysis process was studied. The crumple-structured CoSe(x)-rGO composite powders prepared by spray pyrolysis at 800 °C had a crystal structure consisting mainly of Co0.85 Se with a minor phase of CoSe2. The bare CoSe(x) powders prepared for comparison had a spherical shape and hollow structure. The discharge capacities of the CoSe(x)-rGO composite and bare CoSe(x) powders in the 50th cycle at a constant current density of 0.3 A g(-1) were 420 and 215 mA h g(-1), respectively, and their capacity retentions measured from the second cycle were 80 and 46%, respectively. The high structural stability of the CoSe(x)-rGO composite powders for repeated sodium-ion charge and discharge processes resulted in superior sodium-ion storage properties compared to those of the bare CoSe(x) powders.
开发了一种简单的一锅法合成金属硒化物/还原氧化石墨烯（rGO）复合粉末，用于作为钠离子电池的负极材料。研究了在喷雾热解过程中被选为第一目标材料的CoSe(x)-rGO复合粉末的详细形成机理。通过在800℃下喷雾热解制备的皱折结构CoSe(x)-rGO复合粉末具有主要由Co0.85Se组成的晶体结构，还有少量的CoSe2相。为作比较而制备的裸CoSe(x)粉末呈球形且具有中空结构。在0.3 A g(-1)的恒定电流密度下，CoSe(x)-rGO复合材料和裸CoSe(x)粉末在第50次循环中的放电容量分别为420和215 mA h g(-1)，并且从第二次循环开始测量的它们的容量保持率分别为80%和46%。与裸CoSe(x)粉末相比，CoSe(x)-rGO复合粉末在钠离子反复充电和放电过程中具有高结构稳定性，从而具有优异的钠离子存储性能。
