A Mapping of the Physical and Electrochemical Properties of Composite Lithium‐Ion Batteries Anodes Made from Graphite, Sn, and Si

SMREKAR, SACHA; BRACAMONTE, M. VICTORIA; PRIMO, EMILIANO N.; LUQUE, GUILLERMINA L.; THOMAS, JORGE; BARRACO, DANIEL E.; LEIVA, EZEQUIEL

Batteries & Supercaps

european chemical society publishing

Lugar: BruselaS; Año: 2020

2566-6223

Nowadays, there is an evident need to improve the current Liionbattery systems, in order to make them more reliable,durable and safe. Regarding this objective, the application ofcomposite materials ?based mainly on the combination of Si,Sn and carbon? appears as a very promising alternative forfuture anode materials. However, despite the great amount ofpublications dealing with this topic, there is not a systematicstudy that allows interpreting and understanding how thecombination of these materials affects the electrochemicalperformance of the anodes prepared with them. In light of thisneed, in this work we propose a straightforward ball-millingprocedure to prepare Sn/Si/graphite composites with differentmass proportions of each material. For all compositions, asystematic study was performed in order to determine howeach material affects the specific capacity, capacity fading andstability towards a change in loading current. We found thatthe material prepared with Sn33Si33C33 appears to be the mostpromising one, delivering a reversible capacity of 906.9 mAhg􀀀 1even after 120 cycles at 0.5 Ag􀀀 1, thus encouraging thedevelopment of new composites based on these materials forindustrial applications.