NOVELTY - An active material comprises a lithium composite oxide.    USE - As active material used as anode of secondary battery e.g. lithium ion secondary battery; in electric power storage system or electronic apparatus (claimed) e.g. video camcorder, digital still camera, mobile phone, notebook personal computer, cordless phone, headphone stereo, portable radio, portable television, and personal digital assistant.    ADVANTAGE - Since the secondary battery contains lithium composite oxide (I), both capacity characteristics and safety of secondary battery are achievable. Further, according to the battery pack, the electric vehicle, the electric power storage system, the electric power tool, and the electronic apparatus, similar effects are obtainable. According to the cylindrical-type secondary battery, the anode active material layer of the anode contains the active material as an anode active material. In this case, since high energy density is obtained, a high battery capacity is obtained, and unintentional precipitation of lithium metal at the time of charge and discharge is suppressed, and therefore, safety is secured. Therefore, both capacity characteristics and safety are achievable.    DETAILED DESCRIPTION - A active material comprises a lithium composite oxide having formula (Li)w(Zn)x(Sn)y(Mz)O4 (I) (where M is at least one of cobalt (Co), magnesium (Mg), nickel (Ni), calcium (Ca), aluminum (A), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), copper (Cu), and silver (Ag); w is 0.3-1, x is 0.3-1, y is 0.8-1.2 and (w+x+y+z) is 3). INDEPENDENT CLAIMS are included for the following:    (1) a electrode (20) comprising the lithium composite oxide (I);    (2) a secondary battery (A1) comprising a cathode (21), an anode (22), and an electrolytic solution, where the anode includes the lithium composite oxide (I);    (3) a battery pack comprising the secondary battery (A1), a control section configured to control operation of the secondary battery, and a switch section configured to switch the operation of the secondary battery;    (4) an electric vehicle comprising the secondary battery (A1), a conversion section configured to convert electric power supplied from the secondary battery into drive power, a drive section configured to operate according to the drive power, and a control section configured to control operation of the secondary battery;    (5) an electric power storage system comprising the secondary battery (A1), at least one electric device configured to be supplied with electric power from the secondary battery, and a control section configured to control the supplying of the electric power from the secondary battery to the electric devices;    (6) an electric power tool comprising the secondary battery (A1), and a movable section configured to be supplied with electric power from the secondary battery; and    (7) an electronic apparatus comprising the secondary battery (A1) as an electric power supply source.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the electrode and the secondary battery (cylindrical type) that use an active material.    Battery can (11)    Insulating plates (12, 13)    Battery cover (14)    Electrode body (20)    Cathode (21)    Anode (22)    Cathode lead (25)    Anode lead (26)