|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Late News Posters
||PP-15: Electrodeposited Tin-Antimony-Copper Alloy Negative Electrode for Lithium Ion Batteries
||Srijan Sengupta, Arijit Mitra, Manila Mallik, Prem Prakash Dahiya, Karabi Das, Subhasis Basu Majumder, Siddhartha Das
|On-Site Speaker (Planned)
We developed a Tin-Antimony-Copper alloy based negative electrode for lithium-ion battery synthesized via electrodeposition. Deposition is purposefully carried out at a high over-potential to facilitate dendritic growth and hydrogen induced porosity. The electrode shows a discharge capacity of ~600 mAhg-1 (almost twice than that of graphite: 350 mAhg-1) discharged at a rate of 200mAg-1 for 50 cycles. The idea behind employing this alloy is to break the lithiation/delithiation phenomena into parts to minimize volumetric stress. Sn, SnSb and Cu6Sn5 present in the negative electrode have different lithiation potentials. Thus, when one phase takes lithium and expands the other inactive phases can buffer the strain. The nano-dendritic structure is responsible for shorter lithium diffusion length and macro-pores further buffer volume expansion during lithiation. Delamination of the active materials from the current collector can further be rectified by depositing the alloy on silver collector and by adjusting the cell cut-off voltage.