Construction of MnCo-BTC@C Microspheres by Annealing a Bimetal-Organic Framework with Enhanced Lithium Storage

作者：Zheng, Wen; Fang, Yaobing; Li, Li; Yuan, Wenhui^*

来源：Energy and Fuels, 2022, 36(15): 8471-8479.

DOI：10.1021/acs.energyfuels.2c01489

• HIGH-PERFORMANCE ANODE
• ENERGY-STORAGE
• ELECTROCHEMICAL PERFORMANCE
• ION BATTERIES
• HIGH-CAPACITY
• CARBON
• CHEMISTRY
• GRAPHENE
• MOF
• COMPOSITES

Because of their changeable structure and diversity of morphology, metal-organic frameworks (MOFs) have sparked great interest as anodes for Li-ion batteries (LIBs). However, the poor electrical conductivity of MOFs has limited their application in LIBs. Herein, a carbon-coated microspheric MnCo-BTC (MC-BTC@C) with a diameter of approximately 1.4 mu m has been prepared by annealing a bimetal-organic framework. The MC-BTC@C microsphere anode retains a high capacity of 1176.4 mAh g(-1) at 200 mA g(-1) after 100 cycles and exhibits a good rate performance (315 mAh g(-1) at 4000 mA g(-1)). Notably, a high capacity of 654 mAh g(-1) is maintained after 300 cycles at 1000 mA g(-1). In addition, electrochemical impedance spectroscopy (EIS) has been applied to investigate the electrochemical behavior of MC-BTC@C and MC-BTC, revealing that the MC-BTC@C microsphere shows faster Li+ transport kinetics. Consequently, this research provides a new avenue for the ingenious design of MOFs with carbon coating for the LIB anode.