Abstract
LiNbO3-coated LiNi0.5Mn1.5O4 powders were synthesized by a sol–gel method, and their intercalation property as a cathode material was investigated using all-solid-state batteries with Li10GeP2S12 solid electrolyte and In–Li metal anode. The LiNbO3 coating delivered reversible lithium intercalation of LiNi0.5Mn1.5O4 through an electrochemical interface with the Li10GeP2S12. Oxygen-deficient LiNi0.5Mn1.5O4−δ with a higher electronic conductivity than LiNi0.5Mn1.5O4 improved the intercalation activity. An all-solid-state battery consisting of 3wt.%-LiNbO3-coated LiNi0.5Mn1.5O4−δ/Li10GeP2S12/In–Li exhibited a discharge capacity of 80mAhg−1 at the first cycle with an average discharge voltage of 4.1V (vs. In-Li), which demonstrates the possibility of 5V class all-solid-state batteries with a high voltage spinel cathode.
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