Abstract: A positive electrode composition comprises a positive electrode active material composed of a lithium transition metal complex oxide represented by the general formula Li1+xNiyCozM1-y-z-wLwO2 (wherein 0?x?0.50, 0.30?y?1.0, 0<z?0.5, 0?w?0.1, 0.30<y+z+w?1, M represents at least one kind selected from Mn and Al, and L represents at least one kind of an element selected from the group consisting of Zr, Ti, Mg and W), and additive particles composed of acidic oxide particles.

Abstract: A positive electrode composition that has improved output power characteristics and low costs, and is also easily handled upon production of a positive electrode, and exhibits an improved yield is provided. A positive electrode composition comprising a positive electrode active material composed of a lithium transition metal complex oxide represented by the general formula Li1+xNiyCozM1?y?z?wLwO2 (wherein 0?x?0.50, 0.30?y?1.0, 0<z?0.5, 0?w?0.1, 0.30<y+z+w?1, M represents at least one kind selected from Mn and Al, and L represents at least one kind of an element selected from the group consisting of Zr, Ti, Mg and W), and additive particles composed of acidic oxide particles is used for positive electrode.

Abstract: A magnetic tape cassette in which unwinding of the tape is prevented independent of the type of hub utilized. Each of the two hubs of the tape cassette includes a first cylindrical wall in which is formed a shaft hole adapted to receive a rotary drive shaft of the tape unit with which the cassette is used. A second cylindrical wall is formed coaxially with the first cylindrical wall and the second cylindrical wall has an engaging groove formed in an interior surface thereof. Also provided is a locking device including a crosswise locking member provided on the bottom of the lower half of the cassette case between the two hubs. The locking member includes a straight bar and arm with locking pawls substantially in the form of a cross and a spring member.