锌离子化海泡石涂层锌负极的制备与性能
Preparation and Properties of Zinc Anode with Zinc Ionized Sepiolite Coating
蒋瑞 1陈泰强1
作者信息
- 1. 上海理工大学 材料与化学学院,上海 200093
- 折叠
摘要
采用酸活化和离子交换法制备了一种锌离子化海泡石(Zn-Sep),将其涂覆在锌负极表面作为人工固体电解质界面(SEI)层,使用XRD、IR和SEM等手段对Zn-Sep的结构与形貌进行表征.结果表明,Zn-Sep涂层不仅能减少锌负极表面副反应的发生,而且由于其均匀分布的锌离子传输孔道和高的锌离子迁移数(t(Zn2+)=0.55),能够通过均匀、快速的锌离子迁移实现无枝晶锌负极.Zn-Sep@Zn 对称电池在 1 mA/cm2 和1 mAh/cm2 的条件下具有极低的过电势(21 mV)并能够稳定循环超过 300 h,即使在 5 mA/cm2 的大电流条件下,也能维持较低的过电势正常工作.与NVO正极组装的Zn-Sep@Zn|NVO全电池在 0.5 A/g条件下循环 150 圈后仍能保持出色的循环稳定性.
Abstract
Zinc ionized sepiolite(Zn-Sep)was prepared via acid activation and ion exchange method,and coated onto the surface of zinc anode as an artificial solid electrolyte interphase(SEI)layer.The structure and morphology of Zn-Sep were characterized by XRD,IR and SEM.The results showed that Zn-Sep coating not only reduced the occurrence of side reactions on zinc anode,but also facilitated uniform and rapid zinc ion migration through its evenly distributed zinc ion transport channels and high zinc-ion transference number(t(Zn2+)= 0.55),enabling dendrite-free zinc anodes.Zn-Sep@Zn symmetric cells exhibited low overpotentials(21 mV)at 1 mA/cm2 and 1 mAh/cm2 and could cycle stably for over 300 hours,even under high current conditions of 5 mA/cm2,Zn-Sep@Zn maintained low overpotential and worked normally.Zn-Sep@Zn|NVO full cells assembled with NVO cathodes exhibited excellent cycling stability after 150 cycles at 0.5 A/g.
关键词
锌离子电池/海泡石/改性/锌负极/涂层Key words
zinc ion battery/sepiolite/modification/zinc anode/coating引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据