Cluster‐Bridging‐Coordinated Bimetallic Metal−Organic Framework as High‐Performance Anode Material for Lithium‐Ion Storage

Abstract

Metal−organic frameworks (MOFs) are potential electrode materials for energy storage owing to abundance of active sites, structural versatility, and well‐organized porous framework. Herein, a cluster‐bridging‐coordinated bimetallic Co4(μ4‐O)[Ir(ppy‐COO)3]2 MOF (Co4‐Ir MOF) with high conductivity and desirable porosity is proposed as promising anode materials for Li+ storage. The Co4‐Ir MOF consists of Co4(μ4‐O) clusters bridge‐coordinated by Ir(ppy‐COOH)3, leading to electrical conductivity four orders of magnitude higher than that of conventional insulating MOFs and Li+ diffusion coefficient two orders of magnitude higher than that of graphite, thus boosting rate capability. The laminated stacking structure and ordered porous framework of Co4‐Ir MOF ensure rapid Li+ transport and storage without large volume variation. As a result, Co4‐Ir MOF anodes deliver high capacity of 1202 mAh g−1, outstanding rate performance (515 mAh g−1 at 3000 mA g−1), and good cycling stability (average capacity decay of 0.041% per cycle for 1000 cycles). Soft‐packed full batteries assembled with Co4‐Ir MOF anodes and LiNi0.5Co0.2Mn0.3O2 cathodes exhibit good stability and flexibility. Moreover, Co4‐Ir MOF anode with fast kinetics is applied in hybrid lithium‐ion capacitor, demonstrating good compatibility with capacitor‐type cathode. This work suggests great potential to rationally design MOF materials with intriguing structures and performances for sustainable energy storage applications.

Room‐Temperature Sodium–Sulfur Batteries: Rules for Catalyst Selection and Electrode Design

“…The low specific capacities of the S/CNFs/Na at high current densities of 5 and 10 A g -1 may be attributed to the slow sodium diffusion kinetic, which would be illustrated by the galvanostatic intermittent titration technique (GITT) and electrochemical impedance spectroscopy measurements. [56,57] The typical voltage plateau keeps stable at different rates, indicating the high electronic conductivity and structural integrity of the S/MoN@CNFs cathode and the Na/MoN@CNFs anode (Figure 6c). The long cycle stability of the S/MoN@CNFs|Na/MoN@CNFs full cell was further investigated at a high current density of 2 A g -1 (Figure 6d).…”

A metal–organic framework-modified separator enables long cycling lithium-ion capacitors with asymmetric electrolyte design

“…These features render MOF-based nanomaterials great potential in electrochemical systems. [43][44][45] Based on this inspiration, the separator was modied with a ZIF-7 interlayer (Fig. 1) via a simple blade-casting process.…”

Self‐Assembly Construction of Carbon Nanotube Network‐Threaded Tetrathiafulvalene‐Bridging Covalent Organic Framework Composite Anodes for High‐Performance Hybrid Lithium‐Ion Capacitors

“…The outstanding energy density, power density, and lifespan of the TTF-COF/CNT||AC HLICs are competitive among the state-of-the-art HLICs in the previous literature (Table S1, Supporting Information). [13][14][15][16][17][18][19][20][21] Electrochemical impedance spectroscopy (EIS) studies were conducted to understand the cycling process of TTF-COF/CNT||AC HLICs (Figure 6f ). As illustrated in the equivalent circuit (Figure S12, Supporting Information), R 0 is the internal resistance, R SEI denotes the resistance for ion conducting in the SEI film, and R ct represents the charge transfer resistance.…”

“…Hybrid lithium-ion capacitors (HLICs), composed of battery-type anodes and capacitor-type cathodes, have the potential to bridge the gap between high-energydensity batteries and high-power-density capacitors by combining the merits of these two systems. [1][2][3][4] Over the past few years, a variety of active materials with pseudocapacitive behaviors, such as transition metal oxides (TiO 2 , [5] V 2 O 5 , [6] and Nb 2 O 5 [7] ), sulfides (FeS 2 [8] ) and nitrides (VN [9] ), carbonaceous materials, [10][11][12] and metal/covalent organic frameworks (MOFs [13][14][15][16][17][18][19] /COFs [20,21] ), have been proposed as promising anode materials for HLICs. However, the imbalances of the electrochemical kinetics and lifespans between the battery-type anodes and capacitor-type cathodes seriously hamper the further development of HLICs.…”