LITHIUM SECONDARY BATTERY

摘要

This lithium secondary battery (10) is provided with: a cathode (30) provided with a cathode active material layer (34) on a cathode collector (32); and an anode (50) provided with an anode active material layer (54) on an anode collector (52). The cathode active material layer (34) contains a cathode active material that can reversibly absorb and release lithium ions. Also, the anode active material layer (54) contains an anode active material comprising a lamellar graphite that has been bent in a manner so that the average number of bends (f) per particle is 0 < f <= 3 and the average aspect ratio is at least 1.8. Additionally, in a cross section perpendicular to the surface of the anode collector (52), the anode active material is oriented in a manner such that the perpendicularity, which is defined as n2/n1, such that, with thetan being the angle formed by the length of the anode active material with respect to the surface of the anode collector (52), n1 is the number of anode active material units such that 0° <= thetan <= 30° and n2 is the number of anode active material units such that 60° <= thetan <= 90°, is at least 1.