MXene Aerogel Scaffolds for High‐Rate Lithium Metal Anodes

Abstract

Li metal is considered to be an ultimate anode for metal batteries owing to its extremely high theoretical capacity and lowest potential. However, numerous issues such as short lifespan and infinite volume expansion caused by the dendrite growth during Li plating/stripping hinder its practical usage. These challenges become more grievous under high current densities. Herein, 3D porous MXene aerogels are proposed as scaffolds for high-rate Li metal anodes using Ti C as an example. With high metallic electron conductivity, fast Li ion transport capability, and abundant Li nucleation sites, such scaffolds could deliver high cycling stability and low overpotential at current density up to 10 mA cm . High rate performance is also demonstrated in full cells with LiFePO as cathodes. This work provides a new type of scaffolds for Li metal anodes and paves the way for the application of non-graphene 2D materials toward high energy density Li metal batteries.

A Sodiophilic Interphase‐Mediated, Dendrite‐Free Anode with Ultrahigh Specific Capacity for Sodium‐Metal Batteries

“…The thin Na@ O f ‐CNT enables a reversible specific capacity as high as 1078 mAh g −1 (areal load of 10 mAh cm −2 ), which approaches the theoretical value of pure Na (1166 mAh g −1 ). This high specific capacity is even comparable to those of recently reported Li metal anodes, demonstrating promising potential for the practical usage . Notably, under this ultra‐high specific capacity, the Na@ O f ‐CNT can stably cycle for ≥2700 h (5 mA cm −2 ).…”

Hydrous RuO2‐Decorated MXene Coordinating with Silver Nanowire Inks Enabling Fully Printed Micro‐Supercapacitors with Extraordinary Volumetric Performance

“…Transmission electron microscopy (TEM) images of thin, transparent MXene nanosheets are illustrated in Figure 2a, with the corresponding selected area electron diffraction (SAED) pattern depicting a well-defined hexagonal crystal symmetry structure, aligning with previously reported data. [36,37] Further information can be garnered from the electron microscopy images of the RuO 2 ·xH 2 O@MXene nanocomposite. [36,37] Further information can be garnered from the electron microscopy images of the RuO 2 ·xH 2 O@MXene nanocomposite.…”

Constructing Co3O4 Nanowires on Carbon Fiber Film as a Lithiophilic Host for Stable Lithium Metal Anodes

“…In addition, the short circuit phenomenon of bare Li symmetrical cell occurs quickly after the cyclic time of 72 hours, which is caused by the serve dendrite growth in such high areal cycle capacity. For evaluating the electrochemical performance level of this manuscript, the parameters including current density, areal capacity, and cycling lifespan of symmetric cells are compared with other reported papers, as shown in Figure S9. It can be clearly seen that this work presents superior electrochemical behaviors, particularly in the high current density and high areal capacity.…”