Uchida Giichiro, Masumoto Kodai, Sakakibara Mikito, Ikebe Yumiko, Ono Shinjiro, Koga Kazunori, Kozawa Takahiro
Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-Ku, Nagoya, 468-8502, Japan.
Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan.
Sci Rep. 2023 Sep 8;13(1):14280. doi: 10.1038/s41598-023-41452-3.
To realize high-capacity Si anodes for next-generation Li-ion batteries, Si/Sn nanowires were fabricated in a single-step procedure using He plasma sputtering at a high pressure of 100-500 mTorr without substrate heating. The Si/Sn nanowires consisted of an amorphous Si core and a crystalline Sn shell. Si/Sn composite nanowire films formed a spider-web-like network structure, a rod-like structure, or an aggregated structure of nanowires and nanoparticles depending on the conditions used in the plasma process. Anodes prepared with Si/Sn nanowire films with the spider-web-like network structure and the aggregated structure of nanowires and nanoparticles showed a high Li-storage capacity of 1219 and 977 mAh/g, respectively, for the initial 54 cycles at a C-rate of 0.01, and a capacity of 644 and 580 mAh/g, respectively, after 135 cycles at a C-rate of 0.1. The developed plasma sputtering process enabled us to form a binder-free high-capacity Si/Sn-nanowire anode via a simple single-step procedure.
为实现用于下一代锂离子电池的高容量硅阳极，采用氦等离子体溅射在100 - 500毫托的高压下且不进行衬底加热的单步工艺制备了硅/锡纳米线。硅/锡纳米线由非晶硅芯和结晶锡壳组成。根据等离子体工艺中使用的条件，硅/锡复合纳米线薄膜形成了蜘蛛网状网络结构、棒状结构或纳米线与纳米颗粒的聚集结构。用具有蜘蛛网状网络结构以及纳米线与纳米颗粒聚集结构的硅/锡纳米线薄膜制备的阳极，在0.01的C倍率下最初54个循环的锂存储容量分别为1219和977 mAh/g，在0.1的C倍率下135个循环后容量分别为644和580 mAh/g。所开发的等离子体溅射工艺使我们能够通过简单的单步工艺形成无粘结剂的高容量硅/锡纳米线阳极。
