Large-scale synthesis of porous Ni2P nanosheets for lithium secondary batteries

Abstract

Porous Ni₂P nanosheets were synthesized via a facile organometallic method based on Ni nanosheet template. These Ni₂P nanosheets exhibit an extremely thin thickness of about 3 nm and a high Brunauer–Emmett–Teller (BET) surface area due to their highly porous structure. As promising anode materials for lithium ion batteries, these nanosheets present a reversible discharge capacity of 379.8 mAh g⁻¹ after 50 cycles, as well as a good rate capability. The improved electrochemical performances of Ni₂P nanosheet electrodes are attributed to the porous and thin sheet structure, resulting in better contact between the active material and electrolyte. Importantly, the thin porous Ni₂P sheets would lead to a short diffusion length of lithium ions.