Inverse‐direction Growth of TiO₂ Microcones by Subsequent Anodization in HClO₄ for Increased Performance of Lithium‐Ion Batteries

Abstract

The effect of second anodization on anodically fabricated TiO2 microcones is investigated with the aim of enhancing the lithium‐ion battery performances; these microcones are treated with a trace concentration of an electrolyte of HClO4. Unlike in the case of second anodization in H2SO4 or H3PO4, which leads to breakdown of the structures of the microcones, the HClO4‐treated TiO2 microcones maintain their unique morphological crystalline structures; this enables the inverse growth of an oxide layer. Particularly, protruding nanoparticles provide a large surface area and thus a higher areal capacity, wherein lithium ions can be stored; these particles are formed on the back‐hemisphere layers of the microcones with an increase in the overall thickness of the barrier oxide layer. The HClO4‐treated TiO2 microcones exhibit an areal capacity of approximately 1.6 times than that of pristine TiO2 microcones as well as an excellent cycling stability and capacity retention.

Rational Design of 1D Porous Carbon Microtubes Supporting Multi‐size Bi2O3 Nanoparticles for Ultra‐long Cycle Life Lithium‐Ion Battery Anodes

“…[13] Tubes, [14] rods, [15] wires [16] and other 1D morphologies are constantly constructed to alleviate volume effect, overspread specific surface area, and ameliorate stability, thereby enhancing electrochemical performance. [17] Chen et al fabricated 1D Nirich LiNi 0.8 Co 0.1 Mn 0.1 O 2 and Li-rich Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 microtubes LIBs electrode materials with the continuous precipitation-induced interdiffusion strategy, which demonstrated excellent electrochemical performances in terms of initial coulombic efficiency, reversible capacity, rate capability and cycle stability reversible capacity. [18] What's more, more active area can be exposed if metal oxides are designed into nanoparticles of different sizes, which is an valid way to reinforce electrochemical performance of LIBs anodes.…”