Performance Enhancement of Tin Antimonide Anodes towards the Achievement of All Solid State Batteries

Abstract

Among various energy storage devices, Li-ion batteries (LIBs) are commercially newlinesuccessful candidates in the market. In spite of all the potential possibilities that could be newlineachieved with present LIB systems, presence of few unsettled problems is ruinous to its newlineperformance, such as flammable organic electrolyte, dendrite formation. To address the newlinetechnical issues with Li ion batteries, the limiting factor, organic liquid electrolyte is replaced with newlinesolid state electrolyte in the present research work. Further to ensure the chemical compatibility, newlineit is assumed that interface modification can be a solution to overcome the problems such as newlineinhomogeneous interface between electrode and SSE materials. newlineFor all solid state Li-ion battery (ASSLIB), perovskite Lithium Lanthanum Titanate newline(LLTO) is identified as the best solid electrolyte material providing high Li ion conductivity at newlineroom temperature. The microwave assisted sol-gel synthesized LLTO is found to deliver ionic newlineconductivity in the range of 1.05*10-3 Scm-1 at room temperature. Based on vast literature newlinesurvey, tin antimony alloy (SnSb- theoretical capacity 995 mAhg-1) anodes are preferred for newlineASSLIB. The SnSb is prepared in the composition SnxSby (x=2-4;y=3-5) by co-precipitation newlinetechnique. In addition to different characteristics, the important requirement for a battery newlinematerial-reversibility is ensured with electrochemical reversibility analysis. In line with this, newlinevarious attempts have been made to enhance the electrical and electrochemical properties of newlineSn2Sb3 such as microwave treatment, and doping. Due to the promising material performance, newlinebattery is assembled with microwave treated Sn4Sb5 anode, microwave sintered LLTO newlineelectrolyte and LiFePO4 cathode. Film coating and pellet geometries have been employed for newlinethe full cell assembly. The electrochemical performances seem to be very underprivileged due newlineto the slow kinetics of the charge carriers in solid medium. Among various attempts like polymer newlinecoating, active metal layer coating, changing the substrates