One-Pot Synthesis of CoSex -rGO Composite Powders by Spray Pyrolysis and Their Application as Anode Material for Sodium-Ion Batteries.
One-Pot Synthesis of CoSex -rGO Composite Powders by Spray Pyrolysis and Their Application as Anode Material for Sodium-Ion Batteries.
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DOI：
10.1002/chem.201504398
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
Gi Dae Park;Y. Kang
中科院分区：
文献类型：
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作者：
Gi Dae Park;Y. Kang
采用一锅法制备了金属硒化物/还原氧化石墨烯（rGO）复合粉体，并将其应用于钠离子电池负极材料。研究了喷雾热分解过程中CoSe（x）-rGO复合粉末的形成机理。通过在800 °C下喷雾热解制备的褶皱结构的CoSe（x）-rGO复合粉末具有主要由Co0.85Se和少量CoSe 2相组成的晶体结构。用于对比的裸CoSe（x）粉末具有球形和中空结构。CoSe（x）-rGO复合物和裸CoSe（x）粉末在0.3A g（-1）的恒定电流密度下在第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复合粉末对于重复钠离子充电和放电过程的高结构稳定性导致上级钠离子存储性能。
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.