SECONDARY BATTERY, BATTERY PACK, ELECTRICALLY DRIVEN VEHICLE, ELECTRIC POWER STORAGE SYSTEM, ELECTRIC TOOL, AND ELECTRONIC DEVICE

A secondary battery includes a positive electrode; a negative electrode including a negative electrode active material layer including a negative electrode active material and a negative electrode conductive agent, and an electrolytic solution. The negative electrode active material includes a plurality of primary negative electrode active material particles and a plurality of secondary negative electrode active material particles, and the negative electrode active material includes a lithium titanium composite oxide.