Dynamic Interfacial Stability Confirmed by Microscopic Optical Operando Experiments Enables High-Retention-Rate Anode-Free Na Metal Full Cells,Advanced Science

当前位置： X-MOL 学术 › Adv. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Dynamic Interfacial Stability Confirmed by Microscopic Optical Operando Experiments Enables High-Retention-Rate Anode-Free Na Metal Full Cells
Advanced Science ( IF 14.3 ) Pub Date : 2021-05-03 , DOI: 10.1002/advs.202005006
Bingyuan Ma ₁ , Youngju Lee ₁ , Peng Bai _{1,

2}

Affiliation

Rechargeable alkali metal anodes hold the promise to significantly increase the energy density of current battery technologies. But they are plagued by dendritic growths and solid-electrolyte interphase (SEI) layers that undermine the battery safety and cycle life. Here, a non-porous ingot-type sodium (Na) metal growth with self-modulated shiny-smooth interfaces is reported for the first time. The Na metal anode can be cycled reversibly, without forming whiskers, mosses, gas bubbles, or disconnected metal particles that are usually observed in other studies. The ideal interfacial stability confirmed in the microcapillary cells is the key to enable anode-free Na metal full cells with a capacity retention rate of 99.93% per cycle, superior to available anode-free Na and Li batteries using liquid electrolytes. Contradictory to the common beliefs established around alkali metal anodes, there is no repeated SEI formation on or within the sodium anode, supported by the X-ray photoelectron spectroscopy elemental depth profile analyses, electrochemical impedance spectroscopy diagnosis, and microscopic imaging.

中文翻译：

显微光学操作实验证实动态界面稳定性可实现高保留率无阳极钠金属全电池

可充电碱金属阳极有望显着提高当前电池技术的能量密度。但它们受到枝晶生长和固体电解质界面（SEI）层的困扰，从而损害了电池的安全性和循环寿命。在这里，首次报道了具有自调制闪亮光滑界面的无孔锭型钠（Na）金属生长。 Na金属阳极可以可逆循环，不会形成其他研究中常见的晶须、苔藓、气泡或断开的金属颗粒。微毛细管电池中所证实的理想界面稳定性是使无阳极钠金属全电池每循环容量保持率为 99.93% 的关键，优于使用液体电解质的无阳极钠和锂电池。与围绕碱金属阳极建立的普遍看法相反，在 X 射线光电子能谱元素深度剖面分析、电化学阻抗谱诊断和显微成像的支持下，钠阳极上或钠阳极内不会重复形成 SEI。

更新日期：2021-06-24

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11