Lithium secondary battery and method of manufacturing the lithium secondary battery

A lithium secondary battery comprising at least a negative electrode, a positive electrode and an electrolyte, and utilizing an oxidation/reduction reactions of lithium ions for charging/discharging,

• wherein the negative electrode has as an active material a composite consisting of a material which contains an amorphous phase, has a half value width not narrower than 0.48 degrees of a peak having a highest diffraction intensity relative to 2θ in X-ray diffractometry and contains at least one element selected from among metal element having an amorphous phase and carbon, and a material which is electrochemically inactive to substances other than lithium in the electrode in which said active material is used during a charging/discharging reaction of the lithium battery.

A manufacturing method of a lithium secondary battery, wherein a material having an amorphous phase is prepared by imparting a physical energy to a crystalline material and wherein an electrode is formed using said material having the amorphous phase as an active material for positive electrode or as an active material for negative electrode.