A Highly Reversible, Dendrite‐Free Lithium Metal Anode Enabled by a Lithium‐Fluoride‐Enriched Interphase

• DOI: 10.1002/adma.201906427
• Publication Date: 2020-02-14T14:33:26Z
• Authors: Chunyu Cui; Chongyin Yang; Nico Eidson; Ji Chen; Fudong Han; Long Chen; Chao Luo; Peng‐Fei Wang; Xiulin Fan; Chunsheng Wang
• Keywords: Lithium fluoride; Interphase; Dendrite (mathematics); Lithium metal; Stripping (fiber); Lithium borate

Metallic lithium is the most competitive anode material for next-generation (Li)-ion batteries. However, one of its major issues Li dendrite growth and detachment, which not only causes safety issues, but also continuously consumes electrolyte Li, leading to low coulombic efficiency (CE) short cycle life metal Herein, metallic suppressed by forming a fluoride (LiF)-enriched solid interphase (SEI) through lithiation surface-fluorinated mesocarbon microbeads (MCMB-F) anodes. The robust LiF-enriched SEI with high interfacial energy effectively promotes planar on surface meanwhile prevents vertical penetration into from dendrites. At discharge capacity 1.2 mAh cm-2 , CE >99.2% plating/stripping in FEC-based achieved within 25 cycles. Coupling pre-lithiated MCMB-F (Li@MCMB-F) commercial LiFePO4 cathode at positive/negative (P/N) ratio 1:1, //Li@MCMB-F cells can be charged/discharged areal 2.4 110 times negligible decay 0.01% per cycle.