阳极
枝晶(数学)
水溶液
铁电性
材料科学
离子
化学工程
无机化学
化学
光电子学
有机化学
电介质
电极
物理化学
几何学
数学
工程类
作者
Hyeonghun Park,WooJun Seol,Geumyong Park,Gopinathan Anoop,Jihun Kim,Tomas Tamulevičius,Sigitas Tamulevičius,S. H. Joo,Seungbum Hong,Ji Young Jo,Hyeong-Jin Kim
标识
DOI:10.1016/j.apsusc.2024.159982
摘要
Zn anodes are highly promising aqueous battery materials due to their abundant sources, environmental friendliness, and high theoretical capacity of 820 mAh g−1. Nevertheless, Zn undergoes dendritic growth and side reactions in mildly acidic electrolytes, leading to shorter cycling lifetimes. Herein, a layer of poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) was spin-coated onto a Zn anode to address this issue. The coated layer physically and electrically blocked contact between the Zn surface and the electrolyte due to its hydrophobic nature. Additionally, the ferroelectric properties of crystalline P(VDF-TrFE) (c-P(VDF-TrFE)) facilitated mass transport and homogenized the electric field, resulting in consistent plating and stripping of Zn ions beneath the film. As a result, the c-P(VDF-TrFE) coating on the Zn symmetric cell led to a stable overpotential (<40 mV) and long cycling lifetimes of more than 350 h (1 mA cm−2, 0.5 mAh cm−2). Even with current conditions of 5 mA cm−2 and 0.5 mAh cm−2, the c-P(VDF-TrFE)-coated Zn symmetric cell demonstrated stable operation for over 600 h. Furthermore, a Zn||MnO2 full cell exhibited high capacity retention after 1000 cycles.
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