Invention Grant
US08404383B2 Negative electrode material for nonaqueous secondary cells, negative electrode for nonaqueous secondary cells, and nonaqueous secondary cell 有权
非水系二次电池用负极材料,非水系二次电池用负极和非水系二次电池

Negative electrode material for nonaqueous secondary cells, negative electrode for nonaqueous secondary cells, and nonaqueous secondary cell
Abstract:
A negative electrode material for a nonaqueous secondary battery capable of realizing a nonaqueous secondary battery having a small charging/discharging irreversible capacity at an initial cycle and exhibiting an excellent high-rate charging/discharging characteristics and an excellent cycle performances is provided. The main component of the material is graphite particles. The median diameter is 5 μm or more, and 40 μm or less in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement. The tapping density is 0.7 g/cm3 or more. The specific surface area measured by a BET method is 0.2 m2/g or more, and 8 m2/g or less. The average circularity is 0.83 or more, and 1.00 or less. When an electrode is produced by a predetermined method for manufacturing an electrode and, the resulting electrode is subjected to X-ray diffraction, the graphite crystal orientation ratio I110/I004 on the electrode is 0.08 or more, where I110 represents the wide angle X-ray diffraction peak area of the (110) peak peak in the region of 2θ=76.5 to 78.5 degrees of the graphite particles on the electrode and I004 represents the wide angle X-ray diffraction peak area of the (004) peak peak in the region of 2θ=53.5 to 56 degrees.
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