使用可批量生产的分离器通过纤维定向离子迁移实现超稳定锌阳极,Advanced Functional Materials

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使用可批量生产的分离器通过纤维定向离子迁移实现超稳定锌阳极
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-11-28 , DOI: 10.1002/adfm.202209301
Lu Yao ₁ , Chenxin Hou ₁ , Mingqiang Liu ₂ , Haibiao Chen ₃ , Qinghe Zhao ₁ , Yan Zhao ₁ , Yuetao Wang ₁ , Lele Liu ₁ , Zu‐Wei Yin ₁ , Jimin Qiu ₁ , Shunning Li ₁ , Runzhi Qin ₁ , Feng Pan ₁

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由于固有的安全性和低成本，水系锌离子电池（AZB）是下一代储能的有前途的候选者。然而，AZB 目前受到锌枝晶生长和不良副反应的困扰，导致循环稳定性差和过早失效。为了抑制Zn的不可控生长，基于聚丙烯腈/氧化石墨烯（简称PG）复合纳米纤维开发了一种独特的隔膜，该隔膜含有丰富的亲锌官能团以调节Zn ²⁺离子在隔膜中的迁移和分布。结果表明，PG 上的氰基配体不仅促进了溶剂化 Zn ^2+的脱水沉积前的离子，但也形成快速通道以实现沉积点的均匀散射。受益于这些特性，PG 隔膜提供了 7.69 mS cm ^{-1的高离子电导率和 0.74 的 Zn}²⁺ 转移数。带 PG 隔膜的 Zn||Zn 对称电池可实现超过 13000 小时的超稳定循环寿命。Zn||Zn _0.27 V ₂ O _{5带PG隔膜的全电池在2 A g}^-1 的高电流密度下经过2800次循环后仍保持原始容量的71.5% 。本研究为设计多功能隔膜以克服 AZB 中锌金属阳极的限制提供了未来的研究方向。

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Ultra-Stable Zn Anode Enabled by Fiber-Directed Ion Migration Using Mass-Producible Separator

Aqueous zinc-ion battery (AZB) is a promising candidate for next-generation energy storage owing to inherent safety and low cost. However, AZBs are currently plagued by Zn dendrite growth and undesirable side-reactions, leading to poor cycling stability and premature failure. To restrain the uncontrollable Zn growth, a unique separator is developed based on polyacrylonitrile/graphene oxide (abbreviated as PG) composite nanofibers, which contain abundance of zincophilicity functional groups to regulate the migration and distribution of Zn²⁺ ions in the separator. It is demonstrated that the cyano ligands on PG not only facilitate the dehydration of solvated Zn²⁺ ions prior to deposition, but also form fast lanes to enable homogenous scattering of deposition spots. Benefiting from these features, the PG separator offers a high ionic conductivity of 7.69 mS cm^-1 and a transference number of 0.74 for Zn²⁺. The Zn||Zn symmetrical cells with PG separators achieve an ultra-stable cycle life over 13 000 h. Zn||Zn_0.27V₂O₅ full batteries with PG separators retain 71.5% of the original capacity after 2800 cycles at a high current density of 2 A g^-1. This study offers future research directions toward the design of multifunctional separators to overcome the limits of Zn metal anode in AZBs.

更新日期：2022-11-28

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