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

A negative electrode for lithium ion secondary batteries according to the present invention is provided with a negative electrode collector and a negative electrode mixture layer that is formed on the negative electrode collector; the negative electrode mixture layer comprises a negative electrode active material which contains graphite particles A that have an internal porosity of 10% or less, graphite particles B that have an internal porosity of more than 10%, and an alloying material that is alloyed with lithium; the negative electrode mixture layer comprises a first layer that is formed on the negative electrode collector and a second layer that is formed on the first layer; the amounts of the graphite particles A and the alloying material contained in the second layer are higher than those contained in the first layer; the amount of the graphite particles B contained in the firs layer is higher than that contained in the second layer; and the content of the alloying material is 15% by mass or less relative to the total amount of the negative electrode active material in the negative electrode mixture layer.