Antisolvent addition has been widely studied in crystallization in the pharmaceutical industries by breaking the solvation balance of the original solution. Here we report as imilar antisolvent strategy to boost Zn reversibility via regulation of the electrolyte on amolecular level. By adding for example methanol into ZnSO 4 electrolyte,t he free water and coordinated water in Zn 2+ solvation sheath gradually interact with the antisolvent, whichm inimizes water activity and weakens Zn 2+ solvation. Concomitantly,d endrite-free Zn deposition occurs via change in the deposition orientation, as evidenced by in situ optical microscopy. Zn reversibility is significantly boosted in antisolvent electrolyte of 50 %m ethanol by volume (Anti-M-50 %) even under harsh environments of À20 8 8Ca nd 60 8 8C. Additionally,t he suppressed side reactions and dendrite-free Zn plating/stripping in Anti-M-50 %e lectrolyte significantly enhance performance of Zn/ polyaniline coin and pouchcells.Wedemonstrate this low-cost strategy can be readily generalized to other solvents,indicating its practical universality.R esults will be of immediate interest and benefit to ar ange of researchers in electrochemistry and energy storage.

Restacked MoS(2) with enlarged c lattice parameter and surface area was prepared by exfoliation and restacking process, exhibiting high reversible lithium storage capacity and superior rate capability as anode material for lithium ion batteries.

Rechargeable aqueous Zn‐ion batteries promise high capacity, low cost, high safety, and sustainability for large‐scale energy storage. The Zn metal anode, however, suffers from the dendrite growth and side reactions that are mainly due to the absence of an appropriate solid electrolyte interphase (SEI) layer. Herein, the in situ formation of a dense, stable, and highly Zn2+‐conductive SEI layer (hopeite) in aqueous Zn chemistry is demonstrated, by introducing Zn(H2PO4)2 salt into the electrolyte. The hopeite SEI (≈140 nm thickness) enables uniform and rapid Zn‐ion transport kinetics for dendrite‐free Zn deposition, and restrains the side reactions via isolating active Zn from the bulk electrolyte. Under practical testing conditions with an ultrathin Zn anode (10 µm), a low negative/positive capacity ratio (≈2.3), and a lean electrolyte (9 µL mAh−1), the Zn/V2O5 full cell retains 94.4% of its original capacity after 500 cycles. This work provides a simple yet practical solution to high‐performance aqueous battery technology via building in situ SEI layers.

No abstract

Rechargeable aqueous zinc-ion batteries (RZIBs) provide a promising complementarity to the existing lithium-ion batteries due to their low cost, non-toxicity and intrinsic safety. However, Zn anodes suffer from zinc dendrite growth and electrolyte corrosion, resulting in poor reversibility. Here, we develop an ultrathin, fluorinated two-dimensional porous covalent organic framework (FCOF) film as a protective layer on the Zn surface. The strong interaction between fluorine (F) in FCOF and Zn reduces the surface energy of the Zn (002) crystal plane, enabling the preferred growth of (002) planes during the electrodeposition process. As a result, Zn deposits show horizontally arranged platelet morphology with (002) orientations preferred. Furthermore, F-containing nanochannels facilitate ion transport and prevent electrolyte penetration for improving corrosion resistance. The FCOF@Zn symmetric cells achieve stability for over 750 h at an ultrahigh current density of 40 mA cm−2. The high-areal-capacity full cells demonstrate hundreds of cycles under high Zn utilization conditions.

Schwefelgefüllte Kügelchen: Ein neuartiger Kohlenstoff‐Schwefel‐Nanokomposit enthält Schwefel innerhalb von doppelschaligen, „weichen“ Kohlenstoff‐Hohlkugeln (siehe Bild) mit großer Oberfläche und Porosität. Dieses Material zeigt eine herausragende elektrochemische Leistungsfähigkeit als Kathodenmaterial für Lithium‐Schwefel‐Batterien.

Solid-electrolyte interphase (SEI) is highly designable to restrain Zn dendrite growth and side reactions between Zn anode and water in rechargeable aqueous zinc-ion batteries (RAZBs), but it remains a challenge....

One of the limitations to the widespread use of hydrogen as an energy carrier is its storage in a safe and compact form. Herein, recent developments in effective high-capacity hydrogen storage materials are reviewed, with a special emphasis on light compounds, including those based on organic porous structures, boron, nitrogen, and aluminum. These elements and their related compounds hold the promise of high, reversible, and practical hydrogen storage capacity for mobile applications, including vehicles and portable power equipment, but also for the large scale and distributed storage of energy for stationary applications. Current understanding of the fundamental principles that govern the interaction of hydrogen with these light compounds is summarized, as well as basic strategies to meet practical targets of hydrogen uptake and release. The limitation of these strategies and current understanding is also discussed and new directions proposed.