Zn batteries have recently become of great interest as energy storage devices. However, their lifespan is limited by irreversible processes at the Zn anodes owing to side reactions and dendrite growth in a mild pH electrolyte. Herein, an artificial ZnF 2 layer on the Zn metal anode surface is developed to address these issues. Modeling results suggest that ZnF 2 can allow insertion of Zn 2+ and offers diffusion channels for the transport to/from the Zn anode via an interstitial diffusion mechanism. The artificial layer suppresses dendrite growth by guiding the Zn plating/stripping underneath the layer, thus enhancing the electrochemical performance of the anode as demonstrated by the Zn-ZnF 2 /MnO 2 full cell. The Zn anode with this artificial layer sustains long-term cycling (more than 700 h) at an areal capacity of 0.5 mAh cm −2 , and the Zn-ZnF 2 /MnO 2 full cells achieve a capacity retention of 89% after 3000 cycles.
As the theoretical limit of intercalation material‐based lithium‐ion batteries is approached, alternative chemistries based on conversion reactions are presently considered. The conversion of sulfur is particularly appealing as it is associated with a theoretical gravimetric energy density up to 2510 Wh kg−1. In this paper, three different carbon‐iron disulfide‐sulfur (C‐FeS2‐S) composites are proposed as alternative positive electrode materials for all‐solid‐state lithium‐sulfur batteries. These are synthesized through a facile, low‐cost, single‐step ball‐milling procedure. It is found that the crystalline structure (evaluated by X‐ray diffraction) and the morphology of the composites (evaluated by scanning electron microscopy) are greatly influenced by the FeS2:S ratio. Li/LiI‐Li3PS4/C‐FeS2‐S solid‐state cells are tested under galvanostatic conditions, while differential capacity plots are used to discuss the peculiar electrochemical features of these novel materials. These cells deliver capacities as high as 1200 mAh g(FeS2+S)−1 at the intermediate loading of 1 mg cm−2 (1.2 mAh cm−2), and up to 3.55 mAh cm−2 for active material loadings as high as 5 mg cm−2 at 20 °C. Such an excellent performance, rarely reported for (sulfur/metal sulfide)‐based, all solid‐state cells, makes these composites highly promising for real application where high positive electrode loadings are required.
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