Inter-layer-calated Thin Li Metal Electrode with Improved Battery Capacity Retention and Dendrite Suppression.
basic_science · Level V
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- Record sourced from PubMed, PMID 32182074.
- Also identified by DOI 10.1021/acs.nanolett.0c00201.
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Abstract
An inter-layer-calated thin Li metal (ILC-Li) electrode using nondelaminated 2D Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene stacks (15 μm) coated on a thin Li host (30 μm) was developed. The excellent electrical conductivity and expanded interlayer space of the MXene provide a fast e<sup>-</sup>/Li<sup>+</sup> transport while the layer limits the Li growth along the perpendicular direction, thus largely mitigating the dendrite growth. The highly reversible Li deposition/extraction greatly reduces the dead lithium and electrolyte consumption by forming a thin solid-electrolyte-interphase (SEI) layer. A small overpotential of less than 135 mV in symmetric cells was achieved after >1050 cycles at 10 mA cm<sup>-2</sup> and 10 mAh cm<sup>-2</sup>. In a full cell, the battery exhibited an improved capacity retention when compared with Li foil, particularly with lean electrolyte of 2.5 μL mAh<sup>-1</sup>, thus leading to a high energy density up to 366.6 Wh/kg. The current approach is manufacture scalable, which displays promising potentials in lithium ion batteries.