A Novel Organic “Polyurea” Thin Film for Ultralong‐Life Lithium‐Metal Anodes via Molecular‐Layer Deposition

• DOI: 10.1002/adma.201806541
• Publication Date: 2018-12-05T08:16:26Z
• Authors: Yipeng Sun; Yang Zhao; Jiwei Wang; Jianneng Liang; Changhong Wang; Qian Sun; Xiaoting Lin; Keegan R. Adair; Jing Luo; Dawei Wang; Ruying Li; Mei Cai; Tsun‐Kong Sham; Xueliang Sun
• Keywords: Polyurea; Lithium metal; Deposition; Layer by layer

Metallic Li is considered as one of the most promising anode materials for next-generation batteries due to its high theoretical capacity and low electrochemical potential. However, commercialization has been impeded by severe safety issues associated with Li-dendrite growth. Non-uniform Li-ion flux on Li-metal surface formation unstable solid electrolyte interphase (SEI) during plating/stripping process lead growth dendritic mossy structures that deteriorate cycling performance can cause short-circuits. Herein, an ultrathin polymer film "polyurea" artificial SEI layer anodes via molecular-layer deposition (MLD) reported. Abundant polar groups in polyurea redistribute a uniform process. As result, efficiently suppressed life span significantly prolonged (three times longer than bare at current density 3 mA cm-2 ). Moreover, detailed interfacial chemistry metal are studied comprehensively. This work provides deep insights into design coatings progress toward realizing batteries.