Single-Ion Conducting Double-Network Hydrogel Electrolytes for Long Cycling Zinc-Ion Batteries
Single-Ion Conducting Double-Network Hydrogel Electrolytes for Long Cycling Zinc-Ion Batteries
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DOI：
10.1021/acsami.1c05941
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发表时间：
2021-06-24
影响因子：
9.5
通讯作者：
Xin, John H.
中科院分区：
文献类型：
--
作者：
Chan, Cheuk Ying;Wang, Ziqi;Xin, John H.
作为锂离子电池的替代品之一，锌离子电池（ZIB）由于其良好的安全性、环保性和低成本而受到研究人员的广泛关注。然而，由于Zn的不均匀沉积和寄生副反应，导致容量衰减甚至短路，水性ZIB离实际应用还有一步之遥。为了解决这些问题，在这里，我们介绍了一个单一的锌离子导电水凝胶电解质（SIHE），P（ICZn-AAm），合成的iota卡拉胶（IC）和丙烯酰胺（AAm）。SIHE通过固定在IC聚合物主链上的丰富的硫酸盐表现出单一的Zn 2+导电性，提供0.93的高Zn 2+迁移数。它还表现出出色的离子电导率为2.15 × 10（-3）S cm（-1）在室温下。在电极-电解质界面处的增强的相容性通过稳定的Zn剥离/电镀性能沿着均匀且光滑的Zn沉积层来验证。研究还发现，由于电解液中缺乏游离阴离子，锌阳极的钝化可以被有效地阻止。用Zn-V_2 O_5电池进一步研究了SIHE的实际性能，其在2C下150次循环的稳定容量为271.6mAh·g（-1），在5C下500次循环的稳定容量为127.5mAh·g（-1）。
As one of the promising alternatives of lithium-ion batteries, zinc-ion batteries (ZIBs) have received growing interest from researchers due to their good safety, eco-friendliness, and low cost. Nevertheless, aqueous ZIBs are still a step away from practical applications due to the nonuniform deposition of Zn and parasitic side reactions, which cause capacity fading and even short circuit. To tackle these problems, here we introduce a single-Zn-ion conducting hydrogel electrolyte (SIHE), P(ICZn-AAm), synthesized with iota carrageenan (IC) and acrylamide (AAm). The SIHE manifests single Zn2+ conductivity via the abundant sulfates fixed on the IC polymer backbone, delivering a high Zn2+ transference number of 0.93. It also exhibits outstanding ionic conductivity of 2.15 x 10(-3) S cm(-1) at room temperature. The enhanced compatibility at the electrode-electrolyte interface was verified by the stable Zn striping/plating performance along with a homogenous and smooth Zn deposition layer. It is also found that the passivation of the Zn anode can be effectively prohibited due to the lack of free anions in the electrolyte. The practical performance of the SIHE is further investigated with Zn-V2O5 batteries, which showed a stable capacity of 271.6 mA h g(-1) over 150 cycles at 2 C and 127.5 mA h g(-1) over 500 cycles at 5 C.