Title:
非水電解液二次電池用負極材料及びこれを用いた非水電解液二次電池
Document Type and Number:
Japanese Patent JP5668308
Kind Code:
B2
Abstract:
To provide a mixed carbon material used for an electrode of a nonaqueous secondary battery with excellent characteristics satisfying both rapid charge-discharge characteristics and high cycle characteristics. A negative electrode material for nonaqueous electrolyte secondary battery, comprising the following carbon material A and carbon material B:
(Carbon material A)
a multilayer-structure carbon material containing a graphitic particle and an amorphous carbon covering the surface of the graphitic particle, which is a carbon material where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å or less, Lc is 900 Å or more, the tap density is 0.8 g/cm 3 or more, and the Raman R value that is a ratio of the peak intensity near 1,360 cm -1 to the peak intensity near 1,580 cm -1 in the argon ion laser Raman spectrum, is from 0.25 to 0.6,
(Carbon material B)
a graphitic particle where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å or less, Lc is 900 Å or more, the tap density is 0.8 g/cm 3 or more, the Raman R value that is a ratio of the peak intensity near 1,360 cm -1 to the peak intensity near 1,580 cm -1 in the argon ion laser Raman spectrum, is from 0.2 to 0.5, and the average degree of circularity as determined by a flaw-type particle analyzer is 0.9 or more.
Inventors:
亀田 隆
佐藤 秀治
佐藤 秀治
Application Number:
JP2010073164A
Publication Date:
February 12, 2015
Filing Date:
March 26, 2010
Export Citation:
Assignee:
三菱化学株式会社
International Classes:
H01M4/587; H01M4/133; H01M4/36; H01M10/0525; H01M10/0566