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ZIF-67@Se@MnO2: A Novel Co-MOF-Based Composite Cathode for Lithium–Selenium Batteries
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-01-17 , DOI: 10.1021/acs.jpcc.8b10598
Wenkai Ye 1 , Weiyang Li 1 , Ke Wang 1 , Weihao Yin 1 , Wenwen Chai 1 , Yi Qu 1 , Yichuan Rui 1 , Bohejin Tang 1
Affiliation  

In this study, metal organic frameworks (MOFs) are prepared as a support to tether active selenium through melt-diffused method, in which MnO2 nanoparticles are loaded on the surface of a Co-MOF (ZIF-67) through simple postmodification means. Selenium is uniformly dispersed on the surface of ZIF-67, and MnO2 nanoparticles (∼5 nm in diameter) are coated on the surface of Se. As an analogue of sandwich, the MOF@Se@metal-oxide structure can inhibit the shuttle effect and dissolution of polyselenides in the electrolyte, which is confirmed by the cyclic voltammetry, galvanostatic discharge/charge, and electrochemical impedance tests. In addition, the cathode displays an excellent electrochemical performance. Especially, the discharge capacity of the ZIF-67@Se@MnO2 cathode is 329 mA h g–1 after 100 cycles at 1C (C = 675 mA g–1) with the high capacity retention of 83.7%. Furthermore, the ZIF-67@Se@MnO2 cathode displays stable capacities of 273 and 232 mA h g–1 after 100 cycles at 2C and 5C, respectively.

中文翻译:

ZIF-67 @ Se @ MnO 2:一种用于锂-硒电池的新型基于Co-MOF的复合阴极

在这项研究中,金属有机骨架(MOFs)通过熔融扩散法制备,以支持系链活性硒,其中MnO 2纳米颗粒通过简单的后改性方法负载在Co-MOF(ZIF-67)的表面上。硒均匀地分散在ZIF-67的表面上,MnO 2纳米颗粒(直径约5 nm)被涂覆在Se的表面上。作为三明治的类似物,MOF @ Se @金属氧化物结构可以抑制穿梭效应和聚硒化物在电解质中的溶解,这已通过循环伏安法,恒电流放电/充电和电化学阻抗测试得到了证实。另外,阴极显示出优异的电化学性能。特别是ZIF-67 @ Se @ MnO 2的放电容量在1C(C = 675 mA g –1)循环100次后,阴极为329 mA hg –1,高容量保持率为83.7%。此外,ZIF-67 @ Se @ MnO 2阴极分别在2C和5C下循环100次后,显示出273和232 mA hg –1的稳定容量。
更新日期:2019-01-18
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