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Fluorine‐Doped Antiperovskite Electrolyte for All‐Solid‐State Lithium‐Ion Batteries

2016; Wiley; Volume: 55; Issue: 34 Linguagem: Inglês

10.1002/anie.201604554

1521-3773

Yutao Li, Weidong Zhou, Sen Xin, Shuai Li, Jinlong Zhu, Xujie Lü, Zhiming Cui, Q. X. Jia, Jianshi Zhou, Yusheng Zhao, John B. Goodenough,

Advancements in Battery Materials

Abstract A fluorine‐doped antiperovskite Li‐ion conductor Li 2 (OH)X (X=Cl, Br) is shown to be a promising candidate for a solid electrolyte in an all‐solid‐state Li‐ion rechargeable battery. Substitution of F − for OH − transforms orthorhombic Li 2 OHCl to a room‐temperature cubic phase, which shows electrochemical stability to 9 V versus Li + /Li and two orders of magnitude higher Li‐ion conductivity than that of orthorhombic Li 2 OHCl. An all‐solid‐state Li/LiFePO 4 with F‐doped Li 2 OHCl as the solid electrolyte showed good cyclability and a high coulombic efficiency over 40 charge/discharge cycles.