Mastering the interface for advanced all-solid-state lithium rechargeable batteries.
A solid electrolyte with a high Li-ion conductivity and a small interfacial resistance against a Li metal anode is a key component in all-solid-state Li metal batteries, but there is no ceramic oxide electrolyte available for this application except the thin-film Li-P oxynitride electrolyte; ceramic electrolytes are either easily reduced by Li metal or penetrated by Li dendrites in a short time. Here, we introduce a solid electrolyte LiZr2(PO4)3with rhombohedral structure at room temperature that has a bulk Li-ion conductivity σLi= 2 × 10-4S⋅cm-1at 25 °C, a high electrochemical stability up to 5.5 V versus Li+/Li, and a small interfacial resistance for Li+transfer. It reacts with a metallic lithium anode to form a Li+-conducting passivation layer (solid-electrolyte interphase) containing Li3P and Li8ZrO6that is wet by the lithium anode and also wets the LiZr2(PO4)3electrolyte. An all-solid-state Li/LiFePO4cell with a polymer catholyte shows good cyclability and a long cycle life.
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
Yutao
Y
Li
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
Weidong
W
Zhou
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
Xi
X
Chen
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545.
Xujie
X
Lü
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
Zhiming
Z
Cui
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
Sen
S
Xin
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
Leigang
L
Xue
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545.
Quanxi
Q
Jia
Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712; jgoodenough@mail.utexas.edu.|Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.
John B
JB
Goodenough
NASICON; interfaces; lithium anode; polymer catholyte; solid electrolyte