One-Dimensional Porous Silicon Nanowires with Large Surface Area for Fast Charge-Discharge Lithium-Ion Batteries

In this study, one-dimensional porous silicon nanowire (1D-PSiNW) arrays were fabricated by one-step metal-assisted chemical etching (MACE) to etch phosphorus-doped silicon wafers. The as-prepared mesoporous 1D-PSiNW arrays here had especially high specific surface areas of 323.47 m(2.)g(-1) and were applied as anodes to achieve fast charge-discharge performance for lithium ion batteries (LIBs). The 1D-PSiNWs anodes with feature size of similar to 7 nm exhibited reversible specific capacity of 2061.1 mAhg(-1) after 1000 cycles at a high current density of 1.5 A.g(-1). Moreover, under the ultrafast charge-discharge current rate of 16.0 A.g(-1), the 1D-PSiNWs anodes still maintained 586.7 mAh.g(-1) capacity even after 5000 cycles. This nanoporous 1D-PSiNW with high surface area is a potential anode candidate for the ultrafast charge-discharge in LIBs with high specific capacity and superior cycling performance.