阳极
电解质
材料科学
合金
极化(电化学)
化学工程
电极
快离子导体
电流密度
无定形固体
纳米技术
冶金
化学
结晶学
物理
工程类
物理化学
量子力学
作者
Yifeng Cheng,Menghao Li,Xuming Yang,Xinzhen Lu,Duojie Wu,Qing Zhang,Yuanmin Zhu,Meng Gu
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-12-01
卷期号:22 (23): 9614-9620
被引量:18
标识
DOI:10.1021/acs.nanolett.2c03718
摘要
Rechargeable solid-state Na metal batteries (SSNMB) can offer high operational safety and energy density. However, poor solid–solid contact between the electrodes and the electrolyte can dramatically increase interfacial resistance and Na dendrite formation, even at low current rates. Therefore, we developed a carbon-fiber-supported liquid Na–K alloy anode that ensures close anode–electrolyte contact, enabling superior cycle stability and rate capability. We then demonstrated the first cryogenic transmission electron microscopy (cryo-TEM) characterization of an SSNMB, capturing the evolution of solid–electrolyte interphase (SEI) and revealing both crystalline and amorphous phases, which could facilitate ion transport and prevent continuous side reactions. By enhancing contact between the Na–K alloy and solid-state electrolyte, these symmetric cells are capable of cycling for over 800 h without notable increased polarization and enable an unprecedented critical current density (CCD) at 40 mA cm–2. Our liquid Na–K alloy approach offers a promising strategic avenue toward commercial SSNMBs.
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