Shape Anisotropy: Anisotropy in Shape and Ligand‐Conjugation of Hybrid Nanoparticulates Manipulates the Mode of Bio–Nano Interaction and Its Outcome (Adv. Funct. Mater. 31/2017)

Solid-state lithium-oxygen (Li-O 2 ) batteries are considered as the next-generation solution for high-safety energy storage systems to overcome the persistent problems associated with liquid battery systems. However, the absence of stable solid-state electrolytes (SSEs) and the design complexity of functional solid-state cathode (SSC) remains a fundamental challenge. Here, a high-performance solid-state Li-O 2 battery is presented with Li-ion-conducted UiO-67 (UiO-67-Li) as SSEs and UiO-67-Li@reduced graphene oxide (rGO) aerogel integrated structure as SSC. The UiO-67-Li SSEs reveal exceptional conductivity (0.64 mS cm −1 at 25 °C) along with high chemical/electrochemical robustness. Furthermore, the prepared UiO-67-Li@rGO aerogel exhibits continuous and abundant Li + /e − transfer and O 2 diffusion channels. Benefiting from the unique chemical properties of the UiO-67-Li SSEs layer, the solid-state Li-O 2 battery achieves suppression of anode dendrite formation, resistance to air-corrosion, and presence of multiple low-impedance wetting interfaces including anode/electrolyte and electrolyte/cathode. This ingenious arrangement endows the solid-state Li-O 2 battery with low overpotential (0.8 V), superior rate capability, and stable cycling life (up to 115 cycles). This novel design and exciting result will open up one avenue for the development of MOF-based SSEs and cathodes for high-performance solid-state Li-O 2 batteries and other solid-state energy-storage devices.

Section: Resultsmentioning

confidence: 99%

Metal–Organic Frameworks Derived Electrolytes Build Multiple Wetting Interfaces for Integrated Solid‐State Lithium–Oxygen Battery

Wang

Chi

et al. 2022

“…Owing to the promising performance of OER, transition metal (TM) oxides have attracted more and more attention, including spinel oxides (AB 2 O 4 ), perovskite oxides, [ 8 ] layered double hydroxides (LDHs), [ 9 ] and so on. Especially, AB 2 O 4 is regarded as a potential candidate for OER to replace precious metals due to their outstanding catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Filling Octahedral Interstices by Building Geometrical Defects to Construct Active Sites for Boosting the Oxygen Evolution Reaction on NiFe₂O₄

Peng

Huang

et al. 2022

Owing to the faster kinetics and outstanding catalytic performance, spinel oxides are regarded as a potential non‐precious metal electrocatalyst for oxygen evolution reaction (OER). Regulation of the geometrical structures of the spinel oxides is one of the most effective approaches for enhancing their OER performance. However, more wide and deep investigations remain because of the structural complexity of spinel oxides, for example, how to fill the unoccupied octahedral interstices to construct a large number of active sites for boosting the OER. Herein, iron foam (IF) supported NiFe2O4 nanocubes with high occupancy at octahedral sites (HOoct‐NFO NC/IF) are synthesized by hydrothermal method followed by anchoring and annealing. Detailed structural characterizations indicate that the foreign Fe cations can be filled into the octahedral interstices along the geometrical defects channel of transition metal cations coordinated with six oxygen anions (TMO6) by etching TMO6 units with an anchoring agent. As a result of the increasing of TMO5 sites with better activity and tuning of the electronic structures, the as‐fabricated HOoct‐NFO NC/IF electrocatalysts exhibit excellent performance for OER with overpotentials of 260 and 310 mV to reach 10 and 400 mA cm−2, respectively. Meanwhile, the catalysts show faster kinetics and superior stability.

“…Compared with the mixed ionogel electrolyte, the heterostructure ionogel electrolytes showed a stable voltage profile without dramatical capacity decay during the long‐term cycling benefiting from the constrained and overlapped EW (Figure 10c). Fan's group proposed an asymmetric HSE constructed by metal‐organic framework (MOF) with a high‐polarity structure and an abundance of surface functional groups [ 66 ] (Figure 10d). By rationally designing a 3D polymer network with a MOF layer and in situ polymerization process, such HSE could not only regulate uniform Li + deposition by MOF layer but reduce the interfacial resistance between electrolyte and electrodes.…”

Section: Application and Design Strategies Of Hsementioning

confidence: 99%

Vertically Heterostructured Solid Electrolytes for Lithium Metal Batteries

Tang

et al. 2022

Solid‐state electrolytes (SSEs) have been regarded as the most attractive candidate for safe and high‐energy lithium (Li) batteries of the next generation. However, the inability of current SSEs to keep up with the performance requirements of batteries is significantly affected by complex factors, especially ionic conductivity, mechanochemical properties, and coupled ion/electron reaction at the electrified interfaces. Strategies in solid electrolyte chemistries and technologies are put forward to overcome these challenges while widening the breadth of possible applications. Among them, vertically heterostructured solid‐state electrolytes (HSE) are constructed as a most promising strategy, which can take advantage of individual SSE layers together and rationalize the stability and compatibility of electrodes. This review comprehensively summarizes the specific features of the HSE based on the current knowledge of SSE failure modes. Additionally, a detailed review of the recent progress on the HSE design in terms of organic polymer electrolytes and inorganic electrolytes is generated. Finally, the advantages and drawbacks of the design strategies are discussed. New perspectives about HSE are proposed as well.