Stable Lithium Anodes Enabled by the Hardening and High Li<sup>+</sup> Flux Interlayer
Shaozhen Huang, Kun Li, An Wang, Siru He, Zhangdi Xie, Huimiao Li, Zhibin Wu, Yuejiao Chen, Libao Chen
Abstract
The commercial use of lithium metal batteries is greatly limited by dendrite formation and slow Li + transport at the anode–electrolyte interface. Herein, the constructed high-modulus polymer interlayer suppressed the Li dendrite formation, leading to dense deposition and enhanced Li + transport. Meanwhile, this formed robust organic solid–electrolyte interphase inhibited the side reactions occurring at the anode–electrolyte interface while promoting a high Li + flux. By constructing the polymer interlayer, the Li@P3DDT||Li@P3DDT symmetric cells demonstrated an impressive stability lifespan of over 3400 h at 1 mA/cm 2 and 1 mAh/cm 2 . The LFP||Li@P3DDT full cells exhibit a remarkable capacity retention of 85.0% over 300 cycles at 4 C. Furthermore, the 50 μm Li@P3DDT||LiCoO 2 pouch cell with 380 Wh kg –1 maintained over 99.9% retention of capacity over 60 cycles at 0.5 C. The research paves the way for the advancement of stable lithium anodes.