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A 3D Lithiophilic Mo 2 N‐Modified Carbon Nanofiber Architecture for Dendrite‐Free Lithium‐Metal Anodes in a Full Cell
Author(s) -
Luo Liu,
Li Jianyu,
Yaghoobnejad Asl Hooman,
Manthiram Arumugam
Publication year - 2019
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.201904537
Subject(s) - materials science , faraday efficiency , overpotential , nucleation , dendrite (mathematics) , anode , carbon nanofiber , chemical engineering , nanofiber , lithium (medication) , electrolyte , carbon fibers , cathode , nanotechnology , electrode , composite material , electrochemistry , carbon nanotube , organic chemistry , medicine , chemistry , geometry , mathematics , engineering , endocrinology , composite number
Abstract The pursuit for high‐energy‐density batteries has inspired the resurgence of metallic lithium (Li) as a promising anode, yet its practical viability is restricted by the uncontrollable Li dendrite growth and huge volume changes during repeated cycling. Herein, a new 3D framework configured with Mo 2 N‐mofidied carbon nanofiber (CNF) architecture is established as a Li host via a facile fabrication method. The lithiophilic Mo 2 N acts as a homogeneously pre‐planted seed with ultralow Li nucleation overpotential, thus spatially guiding a uniform Li nucleation and deposition in the matrix. The conductive CNF skeleton effectively homogenizes the current distribution and Li‐ion flux, further suppressing Li‐dendrite formation. As a result, the 3D hybrid Mo 2 N@CNF structure facilitates a dendrite‐free morphology with greatly alleviated volume expansion, delivering a significantly improved Coulombic efficiency of ≈99.2% over 150 cycles at 4 mA cm −2 . Symmetric cells with Mo 2 N@CNF substrates stably operate over 1500 h at 6 mA cm −2 for 6 mA h cm −2 . Furthermore, full cells paired with LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NMC811) cathodes in conventional carbonate electrolytes achieve a remarkable capacity retention of 90% over 150 cycles. This work sheds new light on the facile design of 3D lithiophilic hosts for dendrite‐free lithium‐metal anodes.