Negative electrode for secondary battery, secondary battery, battery pack, electric vehicle, power storage system, power tool, and electronic device

A secondary battery comprising:

• a positive electrode,
• a negative electrode, and
• an electrolytic solution,
• wherein the negative electrode includes a plurality of particulate negative electrode active materials,
• wherein the plurality of particulate negative electrode active materials have a median diameter D50 of 5 μm or more and 30 μm or less,
• wherein the negative electrode comprises a plurality of particulate binders,
• wherein the particulate binders consist essentially of a two binder system consisting essentially of a first negative electrode binder and a plurality of second negative electrode binders,
• wherein the first negative electrode binder includes one or both of styrene butadiene rubber and a derivative of styrene butadiene,
• wherein the plurality of second negative electrode binders include one or both of polyvinylidene fluoride and a derivative of polyvinylidene fluoride,
• wherein the plurality of second negative electrode binders have a median diameter D50 of 1.0 μm or more and 10 μm or less,
• wherein the median diameter D50 of the plurality of second negative electrode binders is smaller than the median diameter D50 of the plurality of particulate negative electrode active materials,
• wherein the electrolytic solution includes a nonaqueous solvent including one or both of a cyclic carbonate and a chain carbonate,
• wherein the cyclic carbonate includes one or more of ethylene carbonate, propylene carbonate, and butylene carbonate,
• wherein a content of the cyclic carbonate in the electrolytic solution is 50 wt. % or less,
• wherein the chain carbonate includes one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and methyl propyl carbonate,
• wherein at least some of the plurality of second negative electrode binders are provided in a gap between the plurality of particulate negative electrode active materials, and
• wherein the first negative electrode binder coats respective surfaces of the plurality of particulate negative electrode active materials.