Self‐Stabilized and Strongly Adhesive Supramolecular Polymer Protective Layer Enables Ultrahigh‐Rate and Large‐Capacity Lithium‐Metal Anode
Self‐Stabilized and Strongly Adhesive Supramolecular Polymer Protective Layer Enables Ultrahigh‐Rate and Large‐Capacity Lithium‐Metal Anode
复制标题
自稳定和强粘合超分子聚合物保护层使超高倍率和大容量锂金属负极成为可能
DOI：
10.1002/anie.201913351
复制
发表时间：
2020
影响因子：
--
通讯作者：
Xunhui Xiong
中科院分区：
文献类型：
--
作者：
Gang Wang;Chao Chen;Yunhua Chen;Xiongwu Kang;Junhua Hu;Fei Wang;Yong Liu;Xunhui Xiong
构建固体电解质界面（SEI）是克服锂（Li）金属阳极的不良可逆性的高效方法。本文通过简单滴涂法制备了一种由聚环氧乙烷（PEO）侧链和脲基嘧啶酮（UPy）四氢键组成的具有粘接性和自愈合性的超分子共聚物作为锂阳极的保护层。原位形成的LiPEO-UPy SEI层的保护性能由于UPy基团与Li金属之间的自发反应产生的强结合和改善的稳定性而显著增强。一个无规（约70 nm）的LiPEO-UPy层可以有助于稳定和无枝晶循环在10 mAh cm-2的高面积容量在5 mA cm-2的1000小时。这种涂层与有前途的电化学性能一起为开发无枝晶金属阳极提供了新的策略。
Constructing a solid electrolyte interface (SEI) is a highly effective approach to overcome the poor reversibility of lithium (Li) metal anodes. Herein, an adhesive and self-healable supramolecular copolymer, comprising of pendant poly(ethylene oxide) (PEO) segments and ureido-pyrimidinone (UPy) quadruple-hydrogen-bonding moieties, is developed as a protection layer of Li anode by a simple drop-coating. The protection performance of in-situ-formed LiPEO-UPy SEI layer is significantly enhanced owing to the strong binding and improved stability arising from a spontaneous reaction between UPy groups and Li metal. An ultrathin (approximately 70 nm) LiPEO-UPy layer can contribute to stable and dendrite-free cycling at a high areal capacity of 10 mAh cm-2 at 5 mA cm-2 for 1000 h. This coating together with the promising electrochemical performance offers a new strategy for the development of dendrite-free metal anodes.