Fluorinated Rocksalt Cathode with Ultra‐high Active Li Content for Lithium‐ion Batteries

The key to increasing the energy density of lithium-ion batteries is to incorporate high contents of extractable Li into the cathode. Unfortunately, this triggers formidable challenges including structural instability and irreversible chemistry under operation. Here, we report a new kind of ultra-high Li compound: Li_4+x MoO₅ F_x (1≤x≤3) for cathode with an unprecedented level of electrochemically active Li (>3 Li⁺ per formula), delivering a …