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Published on: September 29, 2020
Copper nanowires and copper foam multifunctional bridges in zeolitic imidazolate framework-derived anode material for
Xiaoming Lin1, Jia Lin2, Chenghui Zeng3
1Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou, Guangdong 510006, PR China; School of Environment and Energy, South China University of Technology, Guangzhou, Guangdong 510006, PR China.
Abstract:
Herein, a synthetic strategy for growing trimetallic zeolitic imidazolate framework (ZIF) polyhedrons on copper foam (CF) and interweaving with copper nanowires (CNWs) is proposed. Subsequently, in situ annealing under N2 atmosphere leads to the formation of multi-doped CNWs/Cu0.39Zn0.14Co2.47O4-ZnO/CF (CNWs/CZCOZ/CF). The unique structural characteristics of CNWs/CZCOZ/CF allow it to be directly assembled as a working electrode, without additional conductive additives or binders. When it's used as the lithium-ion battery (LIB) anode, this electrode exhibits a significantly high capacity of 2305 mAh g-1 at 0.1 A g-1 after 500 cycles. More importantly, kinetic analysis on the basis of cyclic voltammograms (CVs) indicates that the pseudocapacitive effect is the primary contributor to the high lithium storage capacity and also accounts for the exceptionally high rate capacity of 713 mAh g-1 even if the current density is at a maximum of 10 A g-1. Moreover, the superior battery performance originates from their advantageous structural diversity and unique compositional features, including synergistic effects among polymetallic components and two highly conductive substrates (CNWs and CF), forming unhindered paths for fast charge transfer.
