MgNiO₂ as a Ceramic Additive To Improve the Durability of Lithium Metal Anode

Ceramic materials are the most popular additives to regulate the reinless interfacial reaction between lithium and the electrolyte by strengthening the SEI layer or tuning lithium deposition. Here, we propose an exceptional material, MgNiO₂, abbreviated as MN, which can improve the durability of lithium metal anode. Since it is undecomposed up to 0 V vs Li/Li⁺, the MN's particles give some semiconductive characteristics to the SEI layer to tune the interfacial reactions. The addition of MgNiO₂ in the protective films lowers interfacial resistance, which is responsible for the improved durability of Li|Cu cells: ∼210 cycles, which is 4 times longer than that of the control. Furthermore, this ceramic is used to modify the carbon film woven with carbon nanofibers (CNF @ MN). The cells with this modified 3-D host present excellent operational lives, as high as ∼2400 h in Li|Li symmetric cells and ∼280 cycles in the Li|NCM811 cells. Our approaches demonstrate that MN is an effective ceramic for stabilizing the lithium anode. It also indicates that the inert nature of the semiconductor to lithium is worth exploring thoroughly.