原位洞察“盐包水”电解质基水性锌电池的界面动力学,Small Methods

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原位洞察“盐包水”电解质基水性锌电池的界面动力学
Small Methods ( IF 10.7 ) Pub Date : 2023-04-25 , DOI: 10.1002/smtd.202300392
Jiao Wang _{1,

2} , Jian-Xin Tian _{1,

2} , Gui-Xian Liu _{1,

2} , Zhen-Zhen Shen _{1,

2} , Rui Wen _{1,

2}

Affiliation

盐包水 (WIS) 电解质被认为是最有前途的水系锌电池 (AZB) 系统之一，因为它具有近 100% 的库仑效率，无枝晶电镀/剥离。然而，对界面机制的理解仍然难以捉摸，这对于进一步提高电池性能至关重要。在此，通过原位原子力显微镜和原位光学显微镜监测固体电解质界面（SEI）形成和随后的镀锌/剥离的界面过程。WIS 系统中均匀致密的富含 LiF 的 SEI 的实时形成可以诱导均匀的六方 Zn 沉积，并在 (002) 晶面中优先取向生长，显示出优异的电镀/剥离可逆性。相比之下，SEI 形成于 1 m双（三氟甲基磺酰基）亚胺锌 (Zn(TFSI) ₂ ) 不均匀且富含惰性 ZnO，在重复的沉积/溶解循环中不利地触发枝晶生长和连续的“死”锌积累。这项工作深入了解了 AZB 中 SEI 演变与 Zn 沉积行为之间的关系，可能会激发对先进可充电水性多价离子电池的固/液界面的合理组成设计和结构优化的更多研究。

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In Situ Insight into the Interfacial Dynamics in “Water-in-Salt” Electrolyte-Based Aqueous Zinc Batteries

Water-in-salt (WIS) electrolyte is considered as one of most promising systems for aqueous zinc batteries (AZBs) due to its dendrite-free plating/stripping with nearly 100% Coulombic efficiency. However, the understanding of the interfacial mechanisms remains elusive, which is crucial for further improvements in battery performance. Herein, the interfacial processes of solid electrolyte interphase (SEI) formation and subsequent Zn plating/stripping are monitored by in situ atomic force microscopy and in situ optical microscopy. The live formation of uniform and compact LiF-rich SEI in WIS systems could induce the uniform hexagonal Zn deposition with preferential orientation growth in the (002) crystal plane, showing excellent plating/stripping reversibility. In contrast, the SEI formed in 1 m zinc bis(trifluoromethylsulfonyl)imide (Zn(TFSI)₂) is uneven and rich in inert ZnO, adversely triggering the dendrite propagation and successive “dead” Zn accumulation in repeated deposition/dissolution cycles. This work provides an in-depth understanding of the relationship between SEI evolution and Zn-deposited behaviors in AZBs, possibly stimulating more research on rational composition design and structural optimization of solid/liquid interface for advanced rechargeable aqueous multivalent-ion batteries.

更新日期：2023-04-25

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