LITHIUM ION SECONDARY BATTERY ELECTRODE AND LITHIUM ION SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery which has excellent load characteristics and an electrode which can constitute the lithium ion secondary battery.SOLUTION: A lithium ion secondary battery electrode includes an electrode mixture layer containing oxide particles, active material particles capable of occluding and discharging Li, a conductive assistant, and a binder made of resin. The oxide particles are such that the average grain size of primary particles is 1 to 20 nm, and that within a 2 =20 to 70° range of a powder X-ray diffraction spectrum, no peaks exist or the half value width of a largest intensity peak is 1.0° or greater. When the sum total of the active material particles and the oxide particles is assumed to be 100 mass%, the proportion of the oxide particles is 0.1 to 10 mass%. The conductive assistant contains carbon nano-tubes. The lithium ion secondary battery electrode being as such, a lithium ion secondary battery includes the electrode as a cathode and/or an anode thereof.