Details

Autor(en) / Beteiligte

• Zhou, Yangen
• Zhang, Xiao
• Ding, Yu
• Bae, Jiwoong
• Guo, Xuelin
• Zhao, Yu
• Yu, Guihua

Titel

Redistributing Li‐Ion Flux by Parallelly Aligned Holey Nanosheets for Dendrite‐Free Li Metal Anodes

Ist Teil von

• Advanced materials (Weinheim), 2020-09, Vol.32 (38), p.e2003920-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• 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. Parallelly aligned holey 2D materials on a lithium metal anode are designed to redistribute the nonuniform Li‐ion flux both in the electrolyte and in the solid‐electrolyte interphase, as well as to provide fast Li‐ion transport. The protected Li anode achieves ultralong lifetime with low overpotential at a high rate with high capacity.