NOVELTY - The battery (10) has a positive electrode layer (14) which comprises a positive electrode active material (12). The positive electrode active material is an oriented polycrystalline structure comprising several lithium transition metal oxide particles oriented in a fixed direction. A solid electrolyte layer (16) is provided with a lithium-ion-conducting material. A negative electrode layer (20) is provided with a negative electrode active material (18).    USE - Solid-state battery for radio-frequency (RF) tag system of active system for RF-identification apparatus (RFID) used for monitoring, or punishment application, storage goods tracking, or retail-goods antitheft, computer, laptop computer, portable type computer, pocket computer, workstation, supercomputer, computer periphery hardware, server, scanner, wristwatch, solar wristwatch, wearable device such as high functional wristwatch-type wearable device, low-functional wristwatch-type wearable device, and spectacles type wearable device, wearable computer, mobile telephone, portable terminal, portable apparatus, electronic organizer (PDA), pocket bell, pager, blackberry (RTM: line of wireless handheld devices and services designed and marketed by BlackBerry Limited) type terminal, personal digital organizer, personal data assistant device, radio, CD player, cassette player, media player, MP3 player, multimedia amusement apparatus, TV, remote control apparatus for stereo system, tracking system, global positioning system, tire pressure monitoring system, positioning device of satellite utilization global positioning system application, movement detection device of security system, hearing aid, timepiece, motor vehicle, washing machine, cleaning machine, digital camera, electric torch, electric machine tool, and group consisting of 3-G shield used in medical treatment and nursing care field, energy amount field, environment and eco field, crime prevention/disaster prevention field, sightseeing and amusement field, construction/maintenance field, an district assistance (all claimed).    ADVANTAGE - The energy density of solid-state battery is greatly improved by the improvement of capacity, so that solid-state battery with high capacity and high energy density is realized, while reducing the size of the battery.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the solid-state battery.    Solid-state battery (10)    Positive electrode active material (12)    Positive electrode layer (14)    Solid electrolyte layer (16)    Negative electrode active material (18)    Negative electrode layer (20)