Premium
Redistributing Li‐Ion Flux by Parallelly Aligned Holey Nanosheets for Dendrite‐Free Li Metal Anodes
Author(s) -
Zhou Yangen,
Zhang Xiao,
Ding Yu,
Bae Jiwoong,
Guo Xuelin,
Zhao Yu,
Yu Guihua
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202003920
Subject(s) - materials science , anode , electrolyte , faraday efficiency , stripping (fiber) , cathode , plating (geology) , chemical engineering , current density , metal , dendrite (mathematics) , ion , inorganic chemistry , electrode , composite material , metallurgy , chemistry , physics , geometry , mathematics , engineering , quantum mechanics , geophysics , geology
Li metal is the most ideal anode material to assemble rechargeable batteries with high energy density. However, nonuniform Li‐ion flux during repeated Li plating and stripping leads to continuous Li dendrite growth and dead Li formation, which causes safety risks and short lifetime and thus impedes the commercialization of Li metal batteries. Here, parallelly aligned holey nanosheets on a Li metal anode are reported to simultaneously redistribute the Li‐ion flux in the electrolyte and in the solid‐electrolyte interphase, which allows uniform Li‐ion distribution as well as fast Li‐ion diffusion for reversible Li plating and stripping. With holey MgO nanosheets as an example, the protected Li anodes achieve Coulombic efficiency of ≈99% and ultralong‐term reversible Li plating/stripping over 2500 h at a high current density of 10 mA cm −2 . A full‐cell battery, using the protected anode, a 4 V Li‐ion cathode, and a commercial carbonate electrolyte, shows capacity retention of 90.9% after 500 cycles.