No abstract

Our synthesized ball-cutting Na-FeHCF nanocubes by controlling the stirring speed as a cathode material for ammonium ion storage exhibit high capacity, excellent rate capability, and unparalleled cycling stability.

An acetylene black modified gel polymer electrolyte was prepared to simultaneously solve the problems of shuttle effect and lithium dendrite growth for high-performance Li–S batteries.

Lithium-metal anodes with high theoretical capacity and ultralow redox potential are regarded as a "holy grail" of the nextgeneration energy-storage industry. Nevertheless, Li inevitably reacts with conventional liquid electrolytes, resulting in uneven electrodeposition, unstable solid electrolyte interphase, and Li dendrite formation that all together lead to a decrease in active lithium, poor battery performance, and catastrophic safety hazards. Here, we report a unique nonporous gel polymer electrolyte (NP-GPE) with a uniform and dense structure, exhibiting an excellent combination of mechanical strength, thermal stability, and high ionic conductivity. The nonporous structure contributed to a uniform distribution of lithium ions for dendrite-free lithium deposition, and Li/NP-GPE/Li symmetric cells can maintain an extremely low and stable polarization after cycling at a high current density of 10 mA cm −2 . This work provides an insight that the NP-GPE can be considered as a candidate for practical applications for lithium-metal anodes.

A compact gel membrane (GM) with certain flexibility is facilely fabricated after a casted PEO/PVDF blend film is swelled by a LiPF 6 -based liquid electrolyte. The GM exhibits a suitable lithium ionic conductivity (0.28 mS cm À 1 at r.t., room temperature), a remarkable lithium-ion transference number (0.52 at r.t.), and high mechanical strength (19.0 MPa) in dry or wet state. Owing to the special comprehensive performance of the GM, dendritefree reversible lithium plating/stripping (up to 500 h) at a current density of 0.5 mA cm À 2 and a capacity of 0.25 mAh cm À 2 is achieved for Li metal anodes at r.t.. The suppression of lithium dendrite of the obtained GM is further demonstrated in Li/GM/LiFePO 4 cells with a high discharge capacity (142 mAh g À 1 at r.t. and 160 mAh g À 1 at 50°C) and a superior cycling stability. This research provides a new strategy for developing lithium metal batteries with high stability and long cycle life.