NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE SHEET FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY

摘要

This negative electrode material for a lithium ion secondary battery is characterised by comprising a mixture of: artificial graphite (A) for which the spacing (d(002)) of the (002) surface of the graphite structure, as measured using powder X-ray diffractometry, is in the range 0.335-0.339nm, and the particle diameter (D50) for which the volume total frequency of the particle size distribution measured using laser diffractometry is 50% is 4-10μm; and a carbon material (B) for which d(002) is at least 0.340nm, and D50 is 7-17μm and is greater than the D50 of the artificial graphite (A).