Quantification on Growing Mass of Solid Electrolyte Interphase and Deposited Mn(II) on the Silicon Anode of LiMn 2 O 4 Full Lithium-Ion Cells.

Silicon is considered to be one of the most important materials for high-energy density anode materials of the next generation lithium-ion batteries. A large number of studies have greatly promoted the practical process of silicon anode, but all of them are experimental results in metal lithium half batteries. There is still an unavoidable problem in commercial application: What is the performance of the full cell composed of silicon anode and manganese-based material cathode? In this paper, the growing SEI and being deposited manganese ions of silicon anode's surface of the spinel lithium manganese oxide LiMn2O4/silicon full cells are quantitatively studied during electrochemical cycling, and the SEI performances are tested by DSC to find out the reason for the rapid decline of reversible capacity in LiMn2O4/silicon system. The experimental results show that manganese ions can make SEI film rapidly grow on silicon anode, and make SEI film more brittle, which results in silicon anode lower Coulombic efficiency and rapid decline of capacity.