▎ 摘　　要

NOVELTY - A coated particulate material comprises (C1) core particles comprising one or more lithium-cobalt-manganese nickel metal compound (I), and (C2) a coating comprising carbonate anions, lithium cations, and niobium and zinc in oxidized form, arranged on the surfaces of the core particles. At least a portion of the niobium is present as cubic lithium-niobium oxide (II) having a crystallographic unit cell of space group Fm-3m. The coating comprises 0.07-0.1 %mass zinc, 0.4-0.6 %mass niobium and 0.08-1.62 %mass carbonate anions. In each case relative to the total mass of the core particles, the molar ratio of lithium and niobium in the coating is 0.5-5.0. USE - Coated particulate material used for preparing electrode used in solid-state lithium-ion electrochemical cell and all-solid-state lithium-ion electrochemical cell (all claimed). Uses included but are not limited to cars, computers, personal digital assistants, mobile telephones, watches, camcorders, digital cameras, thermometers, calculators, and laptop BIOS. ADVANTAGE - The coated particulate material has improved initial discharge capacity and cycling performance and stability, i.e. increase of the initial capacity as well as reduction of the capacity loss during cycling. DETAILED DESCRIPTION - A coated particulate material comprises (C1) core particles comprising one or more lithium-cobalt-manganese nickel metal compound of formula: Li1+tCOxMnyNizMu1-tO2(I), where x, y and z is 0-1, u is 0-0.15, M is one or more elements chosen from aluminum, magnesium, barium, boron, and transition metals other than nickel, cobalt, and manganese, x+y+z is more than 0, x+y+z+u is 1 and t is 0-0.2, and (C2) a coating comprising carbonate anions, lithium cations, and niobium and zinc in oxidized form, arranged on the surfaces of the core particles. At least a portion of the niobium is present as cubic lithium-niobium oxide of formula: Li3NbO4(II) having a crystallographic unit cell of space group Fm-3m. The coating comprises 0.07-0.1 %mass zinc, 0.4-0.6 %mass niobium and 0.08-1.62 %mass carbonate anions. In each case relative to the total mass of the core particles, the molar ratio of lithium and niobium in the coating is 0.5-5.0. INDEPENDENT CLAIMS are included for the following: electrode for use in a solid-state lithium-ion electrochemical cell and/or in an all-solid-state lithium-ion electrochemical cell, which comprises (E1) 50-99 %mass, preferably 70-97 %mass coated particulate material, (E2) 1-50 %mass, preferably 3-30 %mass lithium ion-conducting solid electrolyte material, (E3) optionally electron-conductive carbon, preferably chosen from carbon nanofibers, carbon nanotubes, graphene, carbon black, acetylene black, coke, and graphene oxide, (E4) optionally one or more binding agents; preparation of coated particulate material; and electrochemical cell.