Hierarchically Porous Metal–Organic Gel Hosting Catholyte for Limiting Iodine Diffusion and Self-Discharge Control in Sustainable Aqueous Zinc–I2 Batteries,ACS Applied Materials & Interfaces

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Hierarchically Porous Metal–Organic Gel Hosting Catholyte for Limiting Iodine Diffusion and Self-Discharge Control in Sustainable Aqueous Zinc–I2 Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-05-03 , DOI: 10.1021/acsami.1c03812
Hiren K. Machhi ₁ , Keval K. Sonigara ₁ , Sanjay N. Bariya ₁ , Hemant P. Soni ₂ , Saurabh S. Soni _{1,

3}

Affiliation

Rechargeable aqueous zinc–iodine batteries (AZIBs) represent excellent zinc–iodine redox chemistry and emerged as a promising aspirant due to their high safety, low cost, ease of fabrication, and high energy density. Nevertheless, the high-dissolution-induced iodide diffusion toward the zinc anode brings the self-discharge, which governs the capacity fading and poor cycling life of the battery. Herein, a multipurpose sponge-like porous matrix of a metal–organic gel to host a substantial amount of an iodine-based catholyte and uniform distribution of iodine with controlled iodide diffusion is introduced. Limiting the iodine diffusion due to increased viscosity provides superior electrochemical performance of this promising cathode for solid-state AZIBs. As a result, AZIBs delivering high performance and long-term stability are fabricated with a capacity of 184.9 mA h g^–1 with a superior capacity retention of 95.8% even after 1500 cycles at 1 C rate. The unique concept of self-discharge protection is successfully evaluated. Prototype flexible band-aid-type AZIBs were fabricated, which delivered 166.4 mA h g^–1 capacity in the bending state, and applied to real-scale wearable applications.

中文翻译：

分层多孔金属有机凝胶承载阴极，可限制可持续的Iz-I ₂水性电池中的碘扩散和自放电控制

锌-碘水溶液可充电电池（AZIBs）具有出色的锌-碘氧化还原化学性能，并因其高安全性，低成本，易于制造和高能量密度而成为有前途的吸引者。然而，由高溶解度引起的碘化物向锌阳极的扩散会带来自放电，这会控制电池的容量衰减和较差的循环寿命。在此，介绍了一种多用途的金属有机凝胶状海绵状多孔基质，可容纳大量的基于碘的阴极电解液，并在碘化物扩散受控的情况下使碘均匀分布。由于粘度增加而限制了碘的扩散，为固态AZIB提供了该有前途的阴极优异的电化学性能。因此，即使在1 C速率下经过1500次循环之后，^–1仍具有95.8％的出色容量保持率。自放电保护的独特概念已得到成功评估。原型柔性创可贴式AZIB被制造出来，在弯曲状态下可提供166.4 mA hg ^–1的容量，并应用于实际的可穿戴应用。

更新日期：2021-05-12

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