Chen Xi, Shang Mingwei, Niu Junjie
Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States.
Nano Lett. 2020 Apr 8;20(4):2639-2646. doi: 10.1021/acs.nanolett.0c00201. Epub 2020 Mar 19.
An inter-layer-calated thin Li metal (ILC-Li) electrode using nondelaminated 2D TiCT 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/Li 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 and 10 mAh cm. 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, 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.
开发了一种层间插层薄锂金属（ILC-Li）电极，该电极使用涂覆在薄锂主体（30μm）上的未分层二维TiCT MXene堆叠（15μm）。MXene优异的导电性和扩展的层间空间提供了快速的电子/锂传输，而层则限制了锂沿垂直方向的生长，从而大大减轻了枝晶生长。高度可逆的锂沉积/脱出通过形成薄的固体电解质界面（SEI）层，大大减少了死锂和电解质消耗。在10 mA cm和10 mAh cm的条件下进行>1050次循环后，对称电池实现了小于135 mV的小过电位。在全电池中，与锂箔相比，该电池表现出更好的容量保持率，特别是在2.5μL mAh的贫电解质情况下，从而导致高达366.6 Wh/kg的高能量密度。目前的方法具有可扩展制造性，在锂离子电池中显示出广阔的应用前景。
