TY - JOUR AU - Li, Yanhong AU - Zhang, Lei AU - Yen, Hung‑Yu AU - Zhou, Yucun AU - Jang, Gun AU - Yuan, Songliu AU - Wang, Jeng‑Han AU - Xiong, Peixun AU - Liu, Meilin AU - Park, Ho Seok AU - Li, Wenwu PY - 2023/03/10 Y2 - 2024/03/28 TI - Single-Phase Ternary Compounds with a Disordered Lattice and Liquid Metal Phase for High-Performance Li-Ion Battery Anodes JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 15 IS - SE - Articles DO - 10.1007/s40820-023-01026-4 UR - https://nmlett.org/index.php/nml/article/view/1291 SP - 63 AB - <p>Si is considered as the promising anode materials for lithium-ion batteries (LIBs) owing to their high capacities of 4200 mAh g<sup>−1</sup> and natural abundancy. However, severe electrode pulverization and poor electronic and Li-ionic conductivities hinder their practical applications. To resolve the afore-mentioned problems, we first demonstrate a cation-mixed disordered lattice and unique Li storage mechanism of single-phase ternary GaSiP<sub>2</sub> compound, where the liquid metallic Ga and highly reactive P are incorporated into Si through a ball milling method. As confirmed by experimental and theoretical analyses, the introduced Ga and P enables to achieve the stronger resistance against volume variation and metallic conductivity, respectively, while the cation-mixed lattice provides the faster Li-ionic diffusion capability than those of the parent GaP and Si phases. The resulting GaSiP<sub>2</sub> electrodes delivered the high specific capacity of 1615 mAh g<sup>−1</sup> and high initial Coulombic efficiency of 91%, while the graphite-modified GaSiP<sub>2</sub> (GaSiP<sub>2</sub>@C) achieved 83% of capacity retention after 900 cycles and high-rate capacity of 800 at 10,000&nbsp;mA&nbsp;g<sup>−1</sup>. Furthermore, the LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub>//GaSiP<sub>2</sub>@C full cells achieved the high specific capacity of 1049 mAh g<sup>−1</sup> after 100 cycles, paving a way for the rational design of high-performance LIB anode materials.</p><p>Highlights:</p><p>1 Single-phase ternary GaSiP<sub>2</sub> with a disordered lattice and liquid metal was synthesized.<br>2 GaSiP<sub>2</sub> electrode achieved superior Li-storage performances in both half and full cells.<br>3 Unique self-healing Li-storage mechanism of GaSiP<sub>2</sub> was analyzed.</p> ER -