Abstract:
PROBLEM TO BE SOLVED: To provide a power storage device in which a high capacity retention rate is obtained even when charge and discharge are repeatedly performed multiple times, occurrence of gas can be highly suppressed, and initial direct current resistance is small.SOLUTION: In a power storage device that includes a cathode having a cathode active material layer, an anode having an anode active material layer including graphite in which all or a part of the surface is coated with amorphous carbon, a separator, and an electrolyte, the electrolyte includes unsaturated sultone and phosphazene compound.
Abstract:
PROBLEM TO BE SOLVED: To accurately measure the effective electrostatic capacitance of a capacitor cell even when the electrostatic capacitance of the capacitor cell is measured at a given voltage.SOLUTION: A system includes voltage measurement means for detecting cell voltages of a plurality of capacitor cells C1 to Cn, voltage adjustment means for decreasing or increasing the voltages of the capacitors C1 to Cn, and an arithmetic operation device 16 for controlling the voltage measurement means. The arithmetic operation device 16 determines, based on the cell voltages of the capacitor cells C1 to Cn measured by the voltage measurement means, a measurement start voltage and a measurement end voltage, measures voltage measurement time for dropping of the cell voltages of the capacitor cells C1 to Cn from the measurement start voltage to the measurement end voltage, calculates the electrostatic capacitances of the capacitor cells C1 to Cn on the basis of the voltage measurement time, and corrects the electrostatic capacitances by correction values according to the capacitor cells C1 to Cn to calculate effective electrostatic capacitances.
Abstract:
PROBLEM TO BE SOLVED: To provide a wound-type accumulator which is simplified in the layout of lithium ion supply sources and shortened in time spent on injecting a nonprotonic organic solvent electrolytic solution and on predoping, so as to allow quick completion of assembly and obtain high productivity. SOLUTION: The wound-type accumulator is provided with: a cylindrical wound electrode unit which has cathode and anode strips and is configured by winding from one end in an electrode stack body comprised of a stack of the cathode and anode with a separator disposed therebetween; and an electrolytic solution. In this wound-type accumulator, the anode and/or cathode is doped with lithium ions and/or anions by means of electrochemical contact of the anode and/or cathode with a lithium ion supply source. At the cathode, a cathode gap section is formed, and at least one lithium ion supply source is arranged at the cathode gap section or at a position opposing the cathode gap section at the anode, in a state not contacting the cathode. COPYRIGHT: (C)2010,JPO&INPIT