Nonaqueous electrolyte secondary battery
AssigneeSony Corporation
InventorsNaoyuki Sugeno, Masanori Anzai, Toru Nagaura
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Abstract
A nonaqueous electrolyte secondary batter which comprises a negative electrode which comprises a carbonaceous material capable of doping and de-doping lithium, a positive electrode made of an active material which comprises a Li-containing metal complex oxide of the general formula, Li.sub.x MO.sub.2, wherein M represents at least one member selected from the group consisting of Co, Ni and Mn and 0.5.ltoreq.x.ltoreq.1, and a nonaqueous electrolyte which contains an electrolyte and an organic solvent therefor. The organic solvent is a mixed solvent of propylene carbonate and at least one member selected from the group consisting of diethyl carbonate and dipropyl carbonate.
Claims1
A nonaqueous electrolyte secondary battery comprising:
- a negative electrode including a carbonaceous material capable of doping and de-doping lithium, the carbonaceous material selected from the group consisting of furan resins and petroleum pitches and having a spacing of (002) planes of not less than 3.70 angstroms and any exothermic peak at temperatures not lower than 700.degree. C. when determined differential thermal analysis, the carbonaceous material further including at least one of 0.2 to 5.0 wt % of phosphorus and 0.1 to 2.0 wt % of boron, a positive electrode made of an active material which includes a Li-containing metal complex oxide of the general formula Li.sub.x MO.sub.2, wherein M represents at least one member selected from the group consisting of Co, Ni and Mn and 0.5.ltoreq.X.ltoreq.1, and a nonaqueous electrolyte which contains an electrolyte and an organic solvent therefor, the organic solvent being a mixed solvent of propylene carbonate and at least one member selected from the group consisting of diethyl carbonate and dipropyl carbonate.
Dependencies are inferred from the claim text.