High rate capability of a BaTiO₃-decorated LiCoO₂ cathode prepared via metal organic decomposition

Abstract

Metal organic decomposition (MOD) using octylic acid salts was applied to synthesize a BaTiO3–LiCoO2 (BT–LC) composite powder. The Ba and Ti octylates were utilized as metal precursors, in an attempt to synthesize homogeneous BT nanoparticles on the LC matrix. The BT–LC composite, having a phase-separated composite structure without any impurity phase, was successfully obtained by optimizing the MOD procedure. The composite prepared using octylate precursors exhibited a sharper distribution and better dispersibility of decorated BT particles. Additionally, the average particle size of the decorated BTs using metal octylate was reduced to 23.3 nm, compared to 44.4 nm from conventional processes using Ba acetate as well as Ti alkoxide as precursors. The composite cathode displayed better cell performance than its conventional counterpart; the discharge capacity of the metal octylate-derived specimen was 55.6 mAh/g at a 50C rate, corresponding to 173% of the capacity of the conventional specimen (32.2 mAh/g). The notable improvement in high rate capability obtained in this study, compared with the conventional route, was attributed to the higher density of the triple junction formed by the BT–LC–electrolyte interface.

Functional dielectric materials for high-performance solid-state batteries

“…6(d)). 91 To fully illustrate the importance of the triple-phase junction in facilitating Li + transport, Itoh and coworkers conducted comparative experiments using bare, planar BTO and dot BTO to modify the cathode. 92 From Fig.…”

Ultrafast Ion Transport via Dielectric Nanocube Interface

“…Figure schematically illustrates the ultrafast Li‐ion transport pathway via the dielectric NC interface. Unlike BTO nanoparticles made by conventional soft‐chemical synthesis, e.g., sol‐gel and metal organic decomposition, [ 23 ] the NCs proposed in this study have many advantages, including precise size, narrow size distribution and, most importantly, high dispersibility. [ 24–26 ] Notably, the dielectric NCs displayed high dispersibility in nonpolar solvents, which was attributed to a surface steric‐hindrance effect originating from the bulky oleic acid molecules adsorbed on the NC surfaces, in addition to the hydrophobicity of oleic acid.…”

A surface-supporting method for an anode material of Li4Ti5O12 via an epitaxial thin film approach

“…In the cathode case, either Al 2 O 3 or BaTiO 3 has been reported as the most promising surface-supporting material. [8][9][10][11][12][13] The surface-supporting material also acts as a protective layer to suppress undesirable reactions such as electrolyte decomposition, and it improves cycle life. 14,15) We have studied the effects of introducing surfacesupporting materials by preparing epitaxial thin films that enable us to examine an interface between an active material and an electrolyte.…”