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

摘要

Provided is a negative electrode material that is suitable for use in a negative electrode of a lithium ion secondary battery having high capacity and excellent cycle characteristics. Also provided are a negative electrode and a lithium ion secondary battery using the same. The negative electrode material for lithium ion secondary battery comprises a particle that contains silicon and is capable of storing and releasing a lithium ion and that is characterized, in a volume-based distribution as measured with a laser diffraction particle size distribution meter, by (mode diameter - D50) / D50 = 0.13 or greater and (D90 - mode diameter) / D90 = 0.28 or less, where the mode diameter is the most frequent value in the distribution, D50 is the diameter at 50% accumulation and D90 is the diameter at 90% accumulation.