 The electrode delivered 802 mAh/g after more than 600 cycles, with a Coulombic efficiency of 99.9 percent.Lithium tin Zintl phases, discovered by Eduard Zintl,have been studied as anode materials in lithium-ion energy storage systems for several decades.First reported in 1981 by Robert Huggins, the system has a multiphase discharge curve and stores approximately 1000 mAh/g (Li22Sn5).