High Performance Li‐ion battery Anodes based on Si Nano core in an LATP Matrix with better Electrolyte Compatibility and Temperature Resistance

Novel core/matrix morphologies of Silicon nanostructures/ LATP ceramics are synthesized through a sol ‐ gel assisted method. The Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 powders were coated on Si nanoparticles as an artificial SEI layer selectively conducting Li cations, which also prevents the formation of the thick natural SEI layer formation, improving the cyclic stability. The composite anodes exhibited a specific capacity of discharge capacities of 1789 mA h g −1 at 0.1 C in the ionic liquid electrolyte LiTFSI‐Pyr 14 TFSI. They cycle 500 times with a capacity retention of more than 75%. It is assumed that the promising electrochemical characteristics of the composite anode films are due to the absence of direct contact between the Si nanoparticles and the electrolyte and the presence of LATP providing an efficient and quick pathway for lithium ion transport and acts as a Li ion reservoir. The electrodes also show promising results with suitable ionic liquid based electrolytes at high temperature. Hence the conclusions from the present study projects LATP−Si composite films as a promising anode material for LIBs, with high capacities and long cycling stabilities at room temperature as well as high temperature.