Secondary battery negative electrode and method for manufacturing the same, secondary battery and method for manufacturing the same, battery pack, electric vehicle, power storage system, electric power tool, and electronic device

摘要

The negative electrode includes a negative electrode current collector and a negative electrode active material layer provided on the negative electrode current collector. The negative electrode active material layer includes a first negative electrode active material, a second negative electrode active material, and a negative electrode. And a binder. The first negative electrode active material includes a first center portion containing a material containing carbon as a constituent element, and a first covering portion provided on the surface of the first center portion and containing a polyacrylate. The second negative electrode active material includes a second central portion containing a material containing silicon as a constituent element, and a second covering portion provided on the surface of the second central portion and containing a polyacrylate. The negative electrode binder contains at least one of styrene butadiene rubber, water-dispersible polyvinylidene fluoride, and carboxymethyl cellulose. The ratio of the weight of the polyacrylate contained in the negative electrode active material layer to the weight of the negative electrode active material layer is 0.1 wt% or more and 0.8 wt% or less.