Lou Xiaobing, Ning Yanqun, Li Chao, Shen Ming, Hu Bei, Hu Xiaoshi, Hu Bingwen
State Key Laboratory of Precision Spectroscopy, Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science , East China Normal University , Shanghai 200062 , China.
Inorg Chem. 2018 Mar 19;57(6):3126-3132. doi: 10.1021/acs.inorgchem.7b02939. Epub 2018 Feb 27.
Our previous work suggested that more carboxylate groups might lead to higher energy density for metal-organic frameworks. In this study, we synthesized a layered metal-organic framework (MOF) Ni-BHC by use of 1,2,3,4,5,6-benzenehexacarboxylic acid. After evacuation by thermal treatment, this MOF was employed as an anode for lithium storage. For its rich lithiation sites as well as layered fast-kinetics structure, it delivers a superior reversible capacity of 1261.3 mA h g at 100 mA g, far exceeding the performance of previously reported MOF-based anode materials. Density functional theory calculation and O soft X-ray absorption spectroscopy suggest that the luxuriant carboxylate-metal units play an important part in the electrochemical process.
我们之前的工作表明，更多的羧酸根基团可能会导致金属有机框架具有更高的能量密度。在本研究中，我们使用1,2,3,4,5,6-苯六甲酸合成了一种层状金属有机框架（MOF）Ni-BHC。经过热处理抽空后，这种MOF被用作锂存储的阳极。由于其丰富的锂化位点以及层状快速动力学结构，它在100 mA g下具有1261.3 mA h g的优异可逆容量，远远超过了先前报道的基于MOF的阳极材料的性能。密度泛函理论计算和O软X射线吸收光谱表明，丰富的羧酸根-金属单元在电化学过程中起着重要作用。
