Surfactant-Assisted Synthesis of High Energy {010} Facets Beneficial to Li-Ion Transport Kinetics with Layered LiNi_0.6Co_0.2Mn_0.2O₂

High energy {010} facets are favorable for Li⁺ transport in a layered Ni-rich LiNi_0.6Co_0.2Mn_0.2O₂ cathode through two-dimensional channels that are perpendicular to the <i>c</i> axis. However, those planes can hardly be maintained during the synthesis of layered cathodes. Therefore, we provide a strategy to use appropriate surface active agents which can alter the surface free energy by reducing surface tension directly. Here, a novel self-assembled 3D flower-like hierarchical LiNi_0.6Co_0.2Mn_0.2O₂ is formed with the help of sodium dodecyl sulfate (SDS), and those high energy facets are preserved. Due to the unique surface architectures which would lead to the fast ion transport kinetics as current expands to 100 times (from 0.1 to 10 C), the capacity decay only about 23.4%. Furthermore, full cells assembled against Li₄Ti₅O₁₂ are constructed with a capacity retention of 80.61% at 1 C charge/discharge. This study could show a promising material model for the preferred orientation active planes and higher Li⁺ transport kinetic

Enhanced Microwave Absorption Properties by Tuning Cation Deficiency of Perovskite Oxides of Two-Dimensional LaFeO₃/C Composite in X‑Band

Development of microwave absorption materials with tunable thickness and bandwidth is particularly urgent for practical applications but remains a great challenge. Here, two-dimensional nanocomposites consisting of perovskite oxides (LaFeO₃) and amorphous carbon were successfully obtained through a one pot with heating treatment using sodium chloride as a hard template. The tunable absorption properties were realized by introducing A-site cation deficiency in LaFeO₃ perovskite. Among the A-site cation-deficient perovskites, La_0.62FeO₃/C (L_0.62FOC) has the best microwave absorption properties in which the maximum absorption is −26.6 dB at 9.8 GHz with a thickness of 2.94 mm and the bandwidth range almost covers all X-band. The main reason affecting the microwave absorption performance was derived from the A-site cation deficiency which induced more dipoles polarization loss. This work proposes a promising method to tune the microwave absorption performance via introducing deficiency in a crystal lattice