NOVELTY - The method involves forming a material film over a substrate (100) e.g. glass substrate. A hole is formed in the material film by a nanoimprinting process. A template including a hole is manufactured by exposing the material film with oxygen plasma, where the hole in the template is greater than or equal to 10 nanometer and less than or equal to 50 nanometer. The hole in the template is filled with gel-like material.    USE - Method for manufacturing a gel-like ultra small lithium iron phosphate particle i.e. positive electrode active material of a secondary battery (all claimed) i.e. lithium-ion secondary battery, of an electric propulsion vehicle i.e. electric wheelchair. Can also be used for an electric car, hybrid car, train vehicle, maintenance vehicle, cart and an electronic device e.g. digital camera, video camera, digital photo frame, mobile phone such as cellular phone, portable game machine, portable information terminal, audio reproducing device, display device and computer.    ADVANTAGE - The method enables injecting lithium into a positive electrode and extracting the lithium from the positive electrode in an easy manner, thus making particle size of positive electrode active material small. The method enables reducing particle size of lithium iron phosphate to approximately 50 nanometer as the positive electrode active material, so that charging and discharging rate of the battery can be improved. The method enables transmitting a signal from a power receiving device to a power feeding device when an amount of power in the power receiving device is judged and the power receiving device is charged with a certain amount of power, so that power feeding from the power feeding device to the power receiving device can be stopped, thus preventing a power storage device from being overcharged and increasing frequency in which an energy storage device is charged. The method enables controlling dielectric power supplied to a power load portion, thus preventing overvoltage application to the power load portion and reducing deterioration or breakdown of the power receiving device.    DETAILED DESCRIPTION - The material film is selected from a group consisting of aluminum, tungsten and molybdenum. An INDEPENDENT CLAIM is also included for a secondary battery comprising a positive electrode.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional illustration of a method for manufacturing a template.    Substrate (100)    Template material (102)    Mold (104)