Trimetallic MOF-Derived Cu_0.39Zn_0.14Co_2.47O₄–CuO Interwoven with Carbon Nanotubes on Copper Foam for Superior Lithium Storage with Boosted Kinetics

Abstract

Transition metal oxides (TMOs), identified as a potential candidate for high-energy anode materials for state-of-the-art lithium-ion batteries (LIBs), suffer from the inherent defects of low electronic conductivity and dramatic volume variation, hindering their practical applications. It is still a great challenge to synthesize novel TMO anodes with satisfactory lithium storage performance. Herein, trimetallic Zn–Co–Cu-zeolitic imidazolate framework is designed with carbon nanotubes (CNTs) and copper foam (CF) serving as multifunctional bridges by postsynthetic metal-ion exchange and in situ solvothermal growth. After annealing, a novel trimetallic metal–organic framework (MOF)-derived polymetallic oxide, Cu0.39Zn0.14Co2.47O4–CuO@CNTs/CF hybrid, was successfully prepared. The introduction of conductive CNTs and a three-dimensional (3D) CF substrate effectively boosts the mechanical robustness and electronic conductivity of metal oxide composites, accelerates the lithium-ion diffusion, and reduces the impedance during the lithiation/delithiation process. When it is directly tested as a conductive-agent-free and binder-free electrode in LIBs, it presents distinguished long-cycling stability and high-rate capacity via the dominant mechanism of pseudocapacitive charge storage and the “electron-shared metal-Li+ double electric layer”. The as-prepared Cu0.39Zn0.14Co2.47O4–CuO@CNTs/CF electrode delivers a high specific capacity of 1649 mAh g–1 at 0.2 A g–1 together with 1282 mAh g–1 at 5 A g–1 over 1000 cycles. The novel 3D self-supported MOF-derived polymetallic oxide synthetic strategy proposed in this work sheds light on creation of potential anode materials for next-generation LIBs.

Facile Self-Assembly Solvothermal Preparation of CuO/Cu2O/Coal-Based Reduced Graphene Oxide Nanosheet Composites as an Anode for High-Performance Lithium-Ion Batteries

“…As seen in Figure a, CV measurements were performed with the sweeping rates increasing from 0.1 to 5 mV s –1 , the redox peaks of CCO/CRGO electrodes keeping similar during both cathodic and anodic sweeps, and the peak separations being nearly unanimous, which show that the electrode material has excellent lithium ion intercalation kinetics. According to the CV curve, i and ν correspond to the peak current and scan rate generally submitting a relationship as shown in the following equation: , where the values of a and b are adjusted parameters. The different mechanisms of the electrochemical process were dominated by the different b values.…”

Porous MOFs–Zinc Cobaltite/Carbon Composite Nanofibers for High Lithium Storage

“…The pore size distribution curve indicated that pore size was spread from micro-to mesopores. [28,29] The SSA of Z 2 was 90.61 m 2 g -1 , which was much higher than that of Z 1 (53.61 m 2 g -1 ) and Z 3 (57.84 m 2 g -1 ), indicating that the specific surface area could be optimized by adopting a suitable preparation process. The SSA of 100-Z 2 and 140-Z 2 were 23.34 and 17.58 m 2 g -1 (as shown in Figure S1b in the Supporting Information), respectively, indicating the failed growth of MOFs particles.…”

Metal–Organic Framework-Structured Porous ZnCo2O4/C Composite Nanofibers for High-Rate Lithium-Ion Batteries

“…The N 2 adsorption/desorption measurements were employed to characterize the SSA and pore size distribution. As shown in Figure b, H-ZCO/C possessed a typical IV isotherm with a hysteresis loop according to the IUPAC classification, which indicated different pore size distributions ranging from micro to mesopores . The SSA of H-ZCO/C was 148.7 m 2 ·g –1 , which was much larger than that of L-ZCO/C (22.5 m 2 ·g –1 ) and ZCO (14.2 m 2 ·g –1 ) (Figure S1).…”

“…As shown in Figure 1b, H-ZCO/C possessed a typical IV isotherm with a hysteresis loop according to the IUPAC classification, which indicated different pore size distributions ranging from micro to mesopores. 15 The SSA of H-ZCO/C was 148.7 m 2 •g −1 , which was much larger than that of L-ZCO/C (22.5 m 2 •g −1 ) and ZCO (14.2 m 2 •g −1 ) (Figure S1). Such a large SSA revealed that the MOF structure was well maintained for H-ZCO/C.…”