Highly Ordered Nanoporous Si for Negative Electrode of Rechargeable Lithium-Ion Battery

On-site fabrication and charge–discharge property of TiO2 coated porous silicon electrode by the liquid phase deposition with anodic oxidation

“…4200 mA h g À1 ). Moreover, the operating voltage of Si is 0.0-0.4 V vs. Li/Li + [19][20][21][22], which is relatively close to that of a Li electrode, and therefore a high energy density is expected. The use of PSi instead of a Si wafer should provide an electrode with superior high-speed charge/discharge characteristics and capacity, because of the large surface area of PSi.…”

Silicon nanopillar anodes for lithium-ion batteries using nanoimprint lithography with flexible molds

“…19 To our knowledge, only two previous attempts to apply NIL to the realm of nanopatterned Si Li-ion battery anodes have been published. 19,20 In this paper, we aimed to improve the specific charge capacity of nanostructured Si electrodes fabricated via NIL by applying High-Fidelity Flexible Mold (HiF2M) NIL technology to the production of Si nanopillars. Nanopillar structures are preferable to those previously fabricated by NIL (nanobars and nanoporous Si) due to their smaller size and greater surface area, and are expected to exhibit excellent performance at high cycling rates, as well as good tolerance of the mechanical stresses imposed by lithiation.…”

Microstructural characterization of Li insertion in individual silicon nanowires

“…Following the SEI formation, the redox pair peaks appeared, which show the phase transition of Li-Si phase upon Li insertion into and extraction from the crystalline Si, respectively. A big discharge current peak that indicated a large doublelayer capacity caused by the big surface area began at 0.12 V and charge current peaks emerged at 0.35 and 0.52 V. Such redox behavior of the SiNWs electrode is consistent with lithiation/delithiation of microstructured Si electrodes due to the cycling rate, the electrolyte type, and the shape of SiNWs [18][19][20]. The same redox peaks appeared from the 1st cycle until 50th cycle, reflecting that the same procedure takes place in all cycles.…”

“…This leads to the mechanical degradation and pulverization of electrodes, resulting in a fast capacity fading and a poor cycle life of Li-ion cells. Therefore, most research has been devoted to overcome this barrier and to improve the capacity retention by modifications of micro-and nanogeometrical structures [4][5][6][7][8][9][10][17][18][19][20]. Recently, it was found that nanostructured silicon and microstructured silicon are an attractive anode material with sufficient porosity to accommodate the large volume change during cycling.…”