Presentation Information
[23p-71A-5]Synthesis of Si/SiOx Nanoparticles/Nanowires by Tandem-Modulated Induction Thermal Plasmas with Intermittent Injection of SiO Feedstock and their Charge/Discharge Cycle Characteristics
〇Yasunori Tanaka1, Yurina Nagase1, Ryudai Furukawa1, Yusuke Nakano1, Tatsuo Ishijima1, Makoto Kambara2, Shiori Sueyasu3, Shu Watanabe3, Keitaro Nakamura3 (1.Kanazawa Univ., 2.Osaka Univ., 3.Nisshin Seifun Gr.)
Keywords:
Nanoparticles,Inductively coupled thermal plasma,Mass production
Lithium-ion batteries (LIBs) and all-solid-state LIBs (AS-LIBs) are expected to have even higher capacities for applications such as electric vehicles and power storage systems. Si/SiOx nanomaterials are attracting attention as new negative electrode materials for LIBs. By making it nano-sized, it suppresses crushing due to volume changes during charging and discharging. Furthermore, SiOx (x<1) nanomaterials are used because they can achieve stable cycle characteristics and high Coulombic efficiency. SiO is amorphous and reacts with Li to form a silicate with little expansion, while the high diffusion coefficient of Li forms a good ion path at the negative electrode. The theoretical capacity of SiO is 2.6Ah/g, which is lower than Si's 4.2Ah/g, but seven times the current Graphite capacity of 0.37Ah/g. On the other hand, the authors have developed the Tandem-MITP+TCFF method as a method for mass-producing nanomaterials, and have experimentally succeeded in synthesizing a large amount of nanoparticles at a high production rate of several hundred g/min. In this report, we attempted to produce large quantities of Si/SiOx nanoparticles using the Tandem-MITP + TCFF method using SiO raw material. Furthermore, we measured the charge/discharge characteristics of the LIB negative electrode.