Negative electrode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using same

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 eaxbon 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 0.11 to 0.2.

Description

Technical field [0001] The present invention relates to a negative electrode material for a non-aqueous electrolyte secondary battery. In addition, the present invention also relates to a negative electrode for a non-aqueous electrolyte secondary battery using the negative electrode material, and a non-aqueous electrolyte secondary battery including the negative electrode. Background technique [0002] Has developed a positive electrode and negative electrode capable of occluding and releasing lithium ions, and dissolved LiPF 6 , LiBF 4 Non-aqueous lithium secondary batteries such as non-aqueous electrolytes of lithium salts have been put into practical use. [0003] As the negative electrode material of this battery, various proposals have been proposed. However, in terms of high capacity and excellent flatness of discharge voltage, artificial graphite obtained by graphitization such as natural graphite and coke has been used. Graphite carbon materials such as mesophase pitch and...

AI Technical Summary

Problems solved by technology

[0008] However, this non-aqueous lithium secondary battery has the problem of an increase in irreversible capacity due to amorphous carbon particles, and further improvement in the cycle characteristics and rapid charge-discharge characteristics required for recent lithium secondary batteries is required.

Images