To provide a compound energy element small in size and light in weight and of which voltage drop when a pulse-like load is impressed can be suppressed, and which has a long cycle life of charge and discharge.
The compound energy element is made by housing in the same outer package material 12 a battery positive electrode containing a battery positive electrode layer 2 mainly made of a lithium-containing transition metal oxide, a capacitor positive electrode containing a capacitor positive electrode layer 6 mainly made of a carbonaceous material, a battery negative electrode containing a battery negative electrode layer 4 mainly made of an active material comprising at least one kind out of carbonaceous materials or a lithium-containing titanium oxide, a capacitor negative electrode containing a capacitor negative electrode layer 7 mainly made of an active material comprising at least one kind out of carbonaceous materials or a lithium-containing titanium oxide, and an organic electrolytic solution containing lithium salt. The battery positive electrode and the capacitor positive electrode as well as the battery negative electrode and the capacitor negative electrode are electrically connected, respectively.
KAYANO HIROSHI
KAWAI TETSUO
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