Abstracts Book - IMRC 2018

• SC1-P006
PRE-CONDITIONING OF SILICON ANODES BY SODIATION FOR
LITHIUM-ION BATTERIES
Erick Leonel Espinosa Villatoro 1 , Enrique Quiroga González 1
1 Benemerita Universidad Autonoma de Puebla, Instituto de Física Ing. Luis Rivera Terrazas,
Mexico.
Lithium-ion batteries (LIBs), which present high energy density, have become
the most important electrical energy storage device, attending the global
increase in energy consumption [1]. The LIBs currently in market commonly use
graphite as anodic material, which has a theoretical gravimetric capacity of ~370
mAh/g. However, a lot of ongoing research is dedicated to produce active
materials with higher capacities, being Si the most promising material to replace
graphite (with theoretical gravimetric capacity of ~4200 mAh/g) [2].
Nevertheless, it is known that Si presents low ionic conductivity, being
impossible to charge it at high rates. To improve the ionic transport and
mechanical stability of silicon, it has been proved that pre-conditioning it at low
cycling rates for some charge/discharge cycles helps [3]. In the present work it
is proposed to pre-condition Si using Na, to finally use the material as anode in
a LIB. Electrochemical sodiation and desodiation exhibit similar features than
lithiation and delithiation [4]. The pre-conditioning treatment intends to
facilitate the transport of Li + ions by creating channels in Si with diameter similar
to the diameter of Na + . It is important to mention that the ionic radius of Na + is
considerably larger than that of Li + . The pore size formed by Li + or Na + is in the
range of micropores (diameters smaller than 5 nm) [5].
[1] B. Ellis and L. Nazar, Current Opinion in Solid State and Materials Science,
16 (2012) 168–177.
[2] C. Wu, et al., J. Power Sourc., 340 (2017) 14–21.
[3] E. Quiroga-González, et al., Elecrochim. Acta, 101 (2013) 93–98.
[4] S. Kim, et al., Adv. Energy Mater., 2 (2012) 710–721.
[5] M. Ge, et al., Nano Lett., 12 (2012) 2318–2323.
Keywords: Ion Sodium, Ion Lithium, Batteries
Presenting authors email: erickvillatoro2108@gmail.com