5 V Class All-Solid-State Composite Lithium Battery with Li[sub 3]PO[sub 4] Coated LiNi[sub 0.5]Mn[sub 1.5]O[sub 4]

Abstract

A 5 V class ceramic/polymer composite all-solid-state lithium battery was prepared. The cell configuration was [Li3PO4[Li3PO4 coated LiNi0.5Mn1.5O4LiNi0.5Mn1.5O4 |solid polymer electrolyte| Li]. The total cell impedance was 4 kΩ at 333 K and the discharge capacity was 100 mAh g−1100 mAh g−1 with a discharge voltage plateau in both 4.7 and 4.1 V regions. X-ray absorption near-edge structure results indicated that both transition metal ions, Ni and Mn, involved in the oxidation/reduction processes. The cell without Li3PO4Li3PO4 showed a lower discharge voltage plateau (Li3PO4Li3PO4 film was so thin that it could be nearly removed with only 2 min of Ar etching in X-ray photoelectron spectroscopy, Li3PO4Li3PO4 is thought to have a function as a solid electrolyte interface between LiNi0.5Mn1.5O4LiNi0.5Mn1.5O4 and SPE to prevent the degradation of solid polymer electrolyte. © 2003 The Electrochemical Society. All rights reserved.