Electrolyte-Swellable SEI-Compatible Polymer Nanolayer for Long Cycle Life Li Metal Battery Anode
발표자
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초록
내용
The Li metal anode is notoriously unstable and reactive to electrolytes, forming brittle SEI layers with uneven distribution, exacerbating Li dendrites that ultimately limit the battery life. Here, this work passivates Li metal with electrolyte-swellable polymer nanolayers deposited monolithically by the iCVD method to reinforce and stabilize the native SEI layers. The 100 nm iCVD pDMAMS layer is swelled by 264% under a carbonate electrolyte, establishing the electrolyte-filled soft scaffold for Li+ transport. Notably, the solvogel accommodates homogeneous Li2O-free and Li2CO3-rich native SEI layers, providing a record-high Li+ transference number of 0.95 and ionic conductivity of 6.54 mS/cm. The developed pDMAMS-Li anodes extend the cycle life by 600% in LiNMCO full cells. The underlying mechanism is elucidated by depth profile analysis of the pDMAMS layer, providing new insights to manage the interface of liquid electrolyte and Li metal by bifunctional solvogel.