Abstract: A positive electrode active material precursor having a uniform particle size distribution and represented by Formula 1, wherein a percentage of fine powder with an average particle diameter (D50) of 1 ?m or less is generated when the positive electrode active material precursor is rolled at 2.5 kgf/cm2 is less than 1%, and an aspect ratio is 0.93 or more, and a method of preparing the positive electrode active material precursor [NixCoyM1zM2w](OH)2 ??[Formula 1] in Formula 1, 0.5?x<1, 0<y?0.5, 0<z?0.5, and 0?w?0.1, M1 includes at least one selected from the group consisting of Mn and Al, and M2 includes at least one selected from the group consisting of Zr, B, W, Mo, Cr, Nb, Mg, Hf, Ta, La, Ti, Sr, Ba, Ce, F, P, S, and Y. A method of preparing the positive electrode active material precursor is also provided.

Abstract: A temperature control device is disclosed that includes a heating wire being connected to an alternating current power source though a SCR, a sensing wire being disposed parallel to the heating wire, a thermo-sensitive resin insulating the heating wire and the sensing wire from each other and changing its impedance according to a change in temperature, and a temperature sensing unit outputting a temperature control signal to turn the SCR on or off according to a change in electric current flowing through the thermo-sensitive resin, in which the SCR is turned on or off by a sensing unit diode. The heating wire is heated by a heating current that flows in a heating cycle only, in which a forward voltage is formed in the SCR, and the sensing wire conducts a sensing current that flows in a sensing cycle only, in which a reverse voltage is formed in the SCR.

Abstract: A temperature control device is disclosed that includes a heating wire being connected to an alternating current power source though a SCR, a sensing wire being disposed parallel to the heating wire, a thermo-sensitive resin insulating the heating wire and the sensing wire from each other and changing its impedance according to a change in temperature, and a temperature sensing unit outputting a temperature control signal to turn the SCR on or off according to a change in electric current flowing through the thermo-sensitive resin, in which the SCR is turned on or off by a sensing unit diode. The heating wire is heated by a heating current that flows in a heating cycle only, in which a forward voltage is formed in the SCR, and the sensing wire conducts a sensing current that flows in a sensing cycle only, in which a reverse voltage is formed in the SCR.