Non-aqueous electrolyte secondary battery and method of preparing carbon-based material for negative electrode |
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| 申请号 | EP01106598.4 | 申请日 | 2001-03-15 | 公开(公告)号 | EP1134827A3 | 公开(公告)日 | 2007-06-13 |
| 申请人 | SONY CORPORATION; | 发明人 | Omaru, Atsuo, c/o Sony Fukushima Corporation; Fujishige, Yusuke; | ||||
| 摘要 | A non-aqueous electrolyte secondary battery with a high capacity in which irreversible capacity is decreased, and formation of a coating caused by irreversible reaction, and a method of preparing a preferable carbon-based material for the negative electrode. A negative electrode of the secondary battery is produced using; graphite in which G s (G s = H sg /H sd ) is 10 and below in the surface enhanced Raman spectrum (where H sg is the height of a signal having a peak within the range of 1580 cm -1 to 1620 cm -1 and H sd is the height of a signal having a peak within the range of 1350 cm -1 to 1400 cm -1 ), graphite having at least two peaks on a differential thermogravimetric curve, graphite with the saturated tapping density of 1.0 g/cm 3 and more, graphite with the packing characteristic index of 0.42 and more, or graphite with the ratio of a specific surface area after pressing being 2.5 times and below of that before pressing. The graphite material can be obtained by mixing a carbon-based material with a coating material such as pitch or by applying a heat treatment to a carbon-based material in an oxidizing atmosphere and then performing graphitization. | ||||||
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