Porous Silicon Nanotube Arrays as Anode Material for Li-Ion Batteries

Alexander T. Tesfaye (1, 2) , Roberto Gonzalez (2) , Jeffery L. Coffer (2) , Thierry Djenizian (1)

1 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie
2 Ft Worth

We report the electrochemical performance of Si nanotube vertical arrays possessing thin porous sidewalls for Li-ion batteries. Porous Si nanotubes were fabricated on stainless steel substrates using a sacrificial ZnO nanowire template method. These porous Si nanotubes are stable at multiple C-rates. A second discharge capacity of 3095 mAh g(-1) with a Coulombic efficiency of 63% is attained at a rate of C/20 and a stable gravimetric capacity of 1670 mAh g(-1) obtained after 30 cycles. The high capacity values are attributed to the large surface area offered by the porosity of the 3D nanostructures, thereby promoting lithium-ion storage according to a pseudocapacitive mechanism.

Mots clés: silicon nanotube arrays; porous silicon; ZnO nanowire templates; anode; Li-ion batteries

Domaines: Matériaux

Alexander T. Tesfaye, Roberto Gonzalez, Jeffery L. Coffer, Thierry Djenizian. Porous Silicon Nanotube Arrays as Anode Material for Li-Ion Batteries. ACS Applied Materials & Interfaces, 2015, 7 (37), pp.20495 - 20498. ⟨10.1021/acsami.5b05705⟩. ⟨hal-01416711⟩