Constructing fast-ion-conductive disordered interphase for high-performance zinc-ion and zinc-iodine batteries

The issues of Zn dendrite and severe Zn2+ transport destabilization in the electrode/electrolyte interface have been the main obstacles to the commercialization of aqueous Zn-based batteries. Here, a disordered zinc silicate ( ZSO) artificial solid electrolyte interphase with high Zn2+ conductivity (9.29 mS center dot cm(-1)) is proposed to address these dilemmas. The disordered ZSO interphase possesses sufficient tunnels for fast Zn2+ transport and highly reversible Zn plating/stripping, which can redistribute the Zn2+ flux and guide uniform Zn deposition to achieve a dendrite-free Zn metal anode. As a proof of concept in zinc-ion batteries, the Zn@ZSO//NH4V4O10 battery delivers a capacity of 336.8mAh center dot g(-1) at 0.2 A center dot g(-1), with a capacity retention of 90.1% at 5 A center dot g(-1) over 1,000 cycles. As for the Zn@ZSO//I-2 battery, by inhibiting I-3(-) diffusion, 97.98% of capacity is retained after shelving for 60 h. This work provides enlightenment into interface designing and iodide diffusion suppression to accelerate the commercialization of high- performance zinc-based batteries.

Automated summary

This study proposes a disordered zinc silicate (ZSO) artificial solid electrolyte interphase with high Zn2+ conductivity to overcome the challenges in aqueous Zn-based batteries. The disordered ZSO interphase enables fast Zn2+ transport and reversible Zn plating/stripping, leading to dendrite-free Zn metal anode. The Zn@ZSO//NH4V4O10 battery shows a capacity retention of 90.1% over 1,000 cycles, while the Zn@ZSO//I-2 battery retains 97.98% of capacity after 60 hours of shelving.