当前位置: X-MOL 学术Nanoscale › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Pseudocapacitance-boosted ultrafast Na storage in a pie-like FeS@C nanohybrid as an advanced anode material for sodium-ion full batteries†
Nanoscale ( IF 5.8 ) Pub Date : 2018-04-12 00:00:00 , DOI: 10.1039/c7nr09674g
Bao-Hua Hou 1, 2, 3, 4, 5 , Ying-Ying Wang 1, 2, 3, 4, 5 , Jin-Zhi Guo 1, 2, 3, 4, 5 , Qiu-Li Ning 1, 2, 3, 4, 5 , Xiao-Tong Xi 1, 2, 3, 4, 5 , Wei-Lin Pang 1, 2, 3, 4, 5 , An-Min Cao 6, 7, 8, 9, 10 , Xinlong Wang 1, 2, 3, 4, 5 , Jing-Ping Zhang 1, 2, 3, 4, 5 , Xing-Long Wu 1, 2, 3, 4, 5
Affiliation  

In order to develop promising anode materials for sodium-ion batteries (SIBs), a novel pie-like FeS@C (P-FeS@C) nanohybrid, in which all ultrasmall FeS nanocrystals (NCs) are completely embedded into the carbon network and sealed by a protective carbon shell, has been prepared. The unique pie-like structure can effectively speed up the kinetics of electrode reactions, while the carbon shell stabilizes the FeS NCs inside. Studies show that the electrochemical reaction processes of P-FeS@C electrodes are dominated by the pseudocapacitive behavior, leading to an ultrafast Na+-insertion/extraction reaction. Hence, the prepared P-FeS@C nanohybrid exhibits superior Na-storage properties especially high rate capability in half cells. For example, it can deliver reversible capacities of 555.1 mA h g−1 at 0.2 A g−1 over 150 cycles and about 60.4 mA h g−1 at 80 A g−1 (an ultrahigh current density even higher than that of the capacitor test). Furthermore, an advanced P-FeS@C//Na3V2(PO4)2O2F full cell has been assembled out, which delivers a stable specific capacity of 441.2 mA h g−1 after 80 cycles at 0.5 A g−1 with a capacity retention of 91.8%.

中文翻译:

伪电容增强的超快Na储存在类似饼状的FeS @ C纳米杂化物中,作为钠离子充满电池的高级阳极材料

为了开发用于钠离子电池(SIB)的有前途的负极材料,一种新型的饼状FeS @ C(P-FeS @ C)纳米杂化物,其中所有超小FeS纳米晶体(NC)都完全嵌入碳网络中,并且已经准备好通过保护性碳壳密封。独特的饼状结构可有效加快电极反应的动力学,而碳壳可稳定内部的FeS NC。研究表明,P-FeS @ C电极的电化学反应过程受拟电容行为的支配,从而导致超快的Na +插入/萃取反应。因此,制备的P-FeS @ C纳米杂化物表现出优异的Na储存性能,特别是在半电池中具有高倍率能力。例如,它可以提供555.1 mA hg -1的可逆容量在0.2 A克-1超过150个循环和大约60.4毫安汞柱-1在80 A G -1(超高电流密度甚至高于电容器测试的)。此外,一种先进的P-的FeS @ C_ //的Na 3 V 2(PO 42 ö 2 F完全细胞已经被组装出,它提供了441.2毫安Hg的稳定比容量-1在0.5 A克80次循环后- 1个,容量保持率达到91.8%。
更新日期:2018-04-12
down
wechat
bug