Fast‐Rate Capable Electrode Material with Higher Energy Density than LiFePO(4): 4.2V LiVPO(4)F Synthesized by Scalable Single‐Step Solid‐State Reaction

Use of compounds that contain fluorine (F) as electrode materials in lithium ion batteries has been considered, but synthesizing single‐phase samples of these compounds is a difficult task. Here, it is demonstrated that a simple scalable single‐step solid‐state process with additional fluorine source can obtain highly pure LiVPO(4)F. The resulting material with submicron particles achieves very high rate capability ≈100 mAh g(−1) at 60 C‐rate (1‐min discharge) and even at 200 C‐rate (18 s discharge). It retains superior capacity, ≈120 mAh g(−1) at 10 C charge/10 C discharge rate (6‐min) for 500 cycles with >95% retention efficiency. Furthermore, LiVPO(4)F shows low polarization even at high rates leading to higher operating potential >3.45 V (≈3.6 V at 60 C‐rate), so it achieves high energy density. It is demonstrated for the first time that highly pure LiVPO(4)F can achieve high power capability comparable to LiFePO(4) and much higher energy density (≈521 Wh g(−1) at 20 C‐rate) than LiFePO(4) even without nanostructured particles. LiVPO(4)F can be a real substitute of LiFePO(4.)