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]

A 5 V class ceramic/polymer composite all-solid-state lithium battery was prepared. The cell configuration was coated |solid polymer electrolyte| Li]. The total cell impedance was 4 kΩ at 333 K and the discharge capacity was 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 showed a lower discharge voltage plateau (<3.5 V) than the composite one. Although the film was so thin that it could be nearly removed with only 2 min of Ar etching in X-ray photoelectron spectroscopy, is thought to have a function as a solid electrolyte interface between and SPE to prevent the degradation of solid polymer electrolyte. © 2003 The Electrochemical Society. All rights reserved.