A nano-granular Sn impregnated NiTi alloy matrix anode for high voltage Li-ion pouch cells

摘要

A well-characterized nano-granular Sn impregnated inactive NiTi alloy matrix has been synthesized through a viable and facile mill-heat method as a suitable anode matrix for Li-ion batteries. These polycrystalline grains of Sn in a NiTi alloy matrix exhibit an average size of similar to 25 nm. The distinct advantages of Sn active site(s) hosting intercalated Li species are better electronic properties, favorable elastic features, in particular a Poisson ratio akin to the Sn-NiTi matrix, and cycling stability facilitating EV and HEV applications. The optimum anode composition Sn0.70Ni0.20Ti0.10 vs. LiNi1/3Mn1/3Co1/3O2 : LiNi0.5Mn0.5O2 composite cathode (wt% of 75 : 25), when used in a rolling in smart-design Li-ion pouch cell fabricated in the lab, yields a high voltage (>4.2 V) and its application was proven by the demonstration of running a toy-car with a load of 1.1 W h on a coarse bitumen road.