Electrospun SnO2/LTO Composite Sub-Micron Dimpled Spheres as High Performance Anode Material for Lithium Ion Batteries

Haridas, Anulekha K and Sharma, Chandra Shekhar and Rao, T N (2017) Electrospun SnO2/LTO Composite Sub-Micron Dimpled Spheres as High Performance Anode Material for Lithium Ion Batteries. In: 231st ECS Meeting, 28 May-1 June 2017, New Orleans, United States.

Preview

Text
ECS_77(11)_339-347_2017.pdf
Download (476kB) | Preview

Abstract

SnO2 is one of the high capacity (782 mAh/g) anode materials used in lithium ion batteries with a tetragonal rutile structure and it alloys at voltage of 0.5V vs Li. However, cyclic stability for SnO2 and Sn based materials is very poor due to high volume expansion during alloying with Li ions (charging) and disintegration of structure during de-alloying (discharging) besides the formation of solid electrolyte interface (SEI) at lower operating voltage of the anode. Many attempts have been made to improve the cycle stability and minimize capacity losses of these materials by nanostructuring, making nanocomposites with graphene and CNT. Even though the results are promising, reproducibility and the scaling up of the electrode material still remains as a challenge. Here we introduce electrospinning as a new way of improving the cycle stability with minimum capacity loss using a composite electrode of SnO2 and lithium titanate (LTO). LTO with a cubic spinel structure can intercalate reversibly with Li ions delivering a capacity of 175 mAh/g, theoretically. Low crystal strains during charging–discharging makes the material work even at high charging rates. The combination of SnO2 and LTO can reduce the volume expansion experienced by bare SnO2 during alloying dealloying reaction as LTO itself is a zero-strain material.

[error in script]

IITH Creators: