Campéon Benoît D L, Wang Chen, Nishina Yuta
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kita-Ku, Okayama 700-8530, Japan.
Nanoscale. 2020 Nov 5;12(42):21780-21787. doi: 10.1039/d0nr05682k.
This study examines the synthesis and electrochemical performance of three-dimensional graphene for Li-ion batteries and Na-ion batteries. The in situ formation of iron hydroxide nanoparticles (Fe(OH)x NPs) of various weights on the surface of graphene oxide, followed by thermal treatment at elevated temperature and washing using hydrochloric acid, furnished 3D graphene. The characterization studies confirmed the prevention of graphene layer stacking by over 90% compared with thermal treatment without Fe(OH)x. The electrochemical performance of the 3D graphene was evaluated as a counter electrode for lithium metal and sodium metal in a half-cell configuration. This material showed good performances with a charging capacity of 507 mA h g-1 at 372 mA g-1 in Li-ion batteries and 252 mA h g-1 at 100 mA g-1 in Na-ion batteries, which is 1.4 and 1.9 times higher, respectively, than the graphene prepared without Fe(OH)x templates.
本研究考察了用于锂离子电池和钠离子电池的三维石墨烯的合成及电化学性能。通过在氧化石墨烯表面原位形成不同重量的氢氧化铁纳米颗粒（Fe(OH)x NPs），随后在高温下进行热处理并用盐酸洗涤，制备出了三维石墨烯。表征研究证实，与未使用Fe(OH)x进行热处理相比，石墨烯层的堆叠被抑制了90%以上。在半电池配置中，评估了三维石墨烯作为锂金属和钠金属对电极的电化学性能。这种材料表现出良好的性能，在锂离子电池中，在372 mA g-1的电流密度下充电容量为507 mA h g-1，在钠离子电池中，在100 mA g-1的电流密度下充电容量为252 mA h g-1，分别比未使用Fe(OH)x模板制备的石墨烯高1.4倍和1.9倍。
