| 摘要 |
In a nonaqueous electrolyte secondary battery including at least negative electrode, a positive electrode, and a lithium-ion-conductive nonaqueous electrolyte, a lithium-containing silicon oxide which is represented by a composition formula LixSiOy where a lithium content x and an oxygen content y are restricted to be in respective ranges of 1.5 </= x </= 4 and 0 < y < 2 is used as a negative -electrode active material. It is even preferable that the above negative electrode be combined with a positive electrode having, as a positive-electrode active material, a transition metal oxide, particularly a lithium-containing metal oxide, selected from Co, Ni, Mn, Fe, V, W, Nb, Ti, and the like. The potential of the negative-electrode active material is low, i.e., base, the charge/discharge capacity is large in a base potential range of 0 to 1 V with respect to metal lithium, and the polarization (internal resistance) during charge and discharge is small. Therefore, there can be obtained a secondary battery which has a high voltage and a high energy efficiency, is superior in large-current chraging/dischraging characteristics, and has a high charging/discharging efficiency. Further, the secondary battery is highly reliable; that is, it is free of such failures as internal short-ciruiting due to dendrite generation, is stable, and has a long cycle life. |
| 申请人 |
SEIKO INSTRUMENTS INC. |
发明人 |
TAHARA, KENSUKE;IWASAKI, FUMIHARU;YAHAGI, SEIJI;SAKATA, AKIFUMI;SAKAI, TSUGIO;ISHIKAWA, HIDEKI;TAKASUGI, SHINICHI |
