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A 3D Lithiophilic Mo2N–Modified Carbon Nanofiber Architecture for Dendrite–Free Lithium–Metal Anodes in a Full Cell

Journal Article · · Advanced Materials
 [1];  [2];  [2];  [2]
  1. Univ. of Texas, Austin, TX (United States); University of Texas at Austin
  2. Univ. of Texas, Austin, TX (United States)
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 Mo2N-mofidied carbon nanofiber (CNF) architecture is established as a Li host via a facile fabrication method. The lithiophilic Mo2N 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 Mo2N@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 Mo2N@CNF substrates stably operate over 1500 h at 6 mA cm–2 for 6 mA h cm–2. Furthermore, full cells paired with LiNi0.8Co0.1Mn0.1O2 (NMC811) cathodes in conventional carbonate electrolytes achieve a remarkable capacity retention of 90% over 150 cycles. Finally, this work sheds new light on the facile design of 3D lithiophilic hosts for dendrite-free lithium-metal anodes.
Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); Welch Foundation
Grant/Contract Number:
EE0007762
OSTI ID:
2217329
Alternate ID(s):
OSTI ID: 1569490
OSTI ID: 1799351
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 48 Vol. 31; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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