相间
电解质
锌
金属
磷酸盐
水溶液
化学工程
阴极
材料科学
化学
电极
冶金
物理化学
有机化学
遗传学
生物
工程类
作者
Wei Wang,Shan Chen,Xuelong Liao,Rong Huang,Jialei Chen,Yaxin Wang,Fei Wang,Huan Wang
出处
期刊:Research Square - Research Square
日期:2022-10-20
标识
DOI:10.21203/rs.3.rs-2143664/v1
摘要
Abstract In situ formation of a stable solid electrolyte interphase (SEI) layer on zinc (Zn) surface is an effective solution to suppress dendrite growth. However, the fast transport of bivalent Zn-ions within the solid interlayer remains very challenging. Herein, we engineer the SEI components and enable a superior kinetic of Zn metal under harsh conditions. Trimethyl phosphate was employed as a cosolvent, which decreases the freezing point of water and spontaneously generate a gradient ZnF 2 –Zn 3 (PO 4 ) 2 interphase. Mechanistic studies reveal the outer ZnF 2 facilitates Zn 2+ desolvation and inner Zn 3 (PO 4 ) 2 serves as channels for Zn 2+ transport, contributing to long-term cycling at subzero temperatures. Impressively, the gradient SEI enables a record lifespan of symmetric Zn cells over 6000 hours (~ 8 months) at − 50 o C. Furthermore, the Zn–KVOH full cell achieves a superhigh areal capacity (9.42 mAh cm − 2 ) under a practical cycling condition (high cathode loading: 33.75 mg cm − 2 ; lean electrolyte: 6.76 µL mAh − 1 ), and delivers a capacity retention of 86.1% after 12000 cycles at − 50 o C. This work provides a feasible route for low-temperature aqueous Zn metal batteries.
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