Spatially Controlled Lithium Deposition on Silver‐Nanocrystals‐Decorated TiO₂ Nanotube Arrays Enabling Ultrastable Lithium Metal Anode

Abstract

3D scaffolds and heterogeneous seeds are two effective ways to guide Li deposition and suppress Li dendrite growth. Herein, 3D TiO2 nanotube (TNT) arrays decorated using ultrafine silver nanocrystals (7–10 nm) through cathodic reduction deposition are first demonstrated as a confined space host for lithium metal deposition. First, TiO2 possesses intrinsic lithium affinity with large Li absorption energy, which facilitates Li capture. Then, ultrafine silver nanocrystals decoration allows the uniform and selective nucleation in nanoscale without a nucleation barrier, leading to the extraordinary formation of lithium metal importing into 3D nanotube arrays. As a result, Li metal anode deposited on such a binary architecture (TNT‐Ag‐Li) delivers a high Coulomb efficiency at around 99.4% even after 300 cycles with a capacity of 2 mA h cm−2. Remarkably, TNT‐Ag‐Li exhibits ultralow overpotential of 4 mV and long‐term cycling life over 2500 h with a capacity of 2 mAh cm–2 in Li symmetric cells. Moreover, the full battery with 3D spaced Li nanotubes anode and LiFeO4 cathode exhibits a stable and high capacity of 115 mA h g–1 at 5 C and an excellent Coulombic efficiency of ≈100% over 500 cycles.

Swallowing Lithium Dendrites in All‐Solid‐State Battery by Lithiation with Silicon Nanoparticles

“…The higher current density means more uneven Li deposition, so the lithiation of Si NPs could be easier to carry out than the lower current density, thus Li/10%Si-PEO 12 /Li cells can persist much longer than 0.2 mA cm −2 . [35] This unexpected deposition phenomenon at high current density further confirms our hypothesis of the lithiation for Si NPs. The introducing of SiO 2 or Si nanoparticles coating onto the polypropylene (PP) separator has been demonstrated an effective way to regulate the Li deposition by the lithiation reaction in liquid electrolytes, and called as "dendrite-eating" strategy.…”

Synergizing Conformal Lithiophilic Granule and Dealloyed Porous Skeleton toward Pragmatic Li Metal Anodes

“…In a broader context, the electrochemical cycling stability of D-Cu@CuSe-Li encouragingly outperforms the state-of-the-art 3D Li metal anodes regardless of the DOD value (Figure 3g). [19,[45][46][47][48][49][50] To showcase the potential application of such a host design, the D-Cu@CuSe-Li electrode was further subject to cycling measurements under a stringent working condition of 3 mA cm À2 /3 mAh cm À2 . Impressively, it delivers a fairly low and stable voltage hysteresis of %20 mV for over 300 h (Figure 3h).…”

Compositional Patterning in Carbon Implanted Titania Nanotubes

“…[9][10][11] Moreover, the decoration of NT walls with nanoparticles enables, for instance, the design of highly efficient batteries and biosensors. [12,13] Besides these procedures, band gap engineering opens up numerous possibilities to specifically alter electronic structure and optical properties. In particular, doping with the nonmetals carbon and nitrogen proves to be beneficial.…”