To provide an inexpensive lithium ion secondary battery excellent in a cycle characteristic and a power characteristic without reducing the battery capacity by selecting suitable materials for a positive electrode active material and a negative electrode active material.
This lithium ion secondary battery comprises a positive electrode using a lithium-nickel composite oxide having a regularly arrayed layer halite structure expressed by the formula: LiNixM1yM2zO2 (M1 is at least one kind selected from Co and Mn; M2 is at least one kind selected from Al, B, Fe, Cr and Mg; x+y+z=1; 0.5<x<0.95; 0.01<y<0.4; 0.001<z<0.2) for a positive electrode active material, and a negative electrode using a graphitic material having a crystal thickness in the c-axis direction not less than 600 and less than 100 . In this case, M1 is Co and M2 is Al in the composition formula of the lithium-nickel composite oxide, and the graphitic material is provided by heat treating mesophase globules at not lower than 700°C and higher than 1500°C.
| JP2002222651 | NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY |
| JP3373978 | [Title of Invention] Non-aqueous electrolyte secondary battery |
| JP2007080619 | BATTERY |
OKUDA NARUAKI
NAKANO HIDEYUKI
TAKEUCHI YOJI
UKIYOU YOSHIO
SASAKI ITSUKI
KOBAYASHI TETSUO
NORITAKE TATSUO
MUKAI KAZUHIKO
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