| abstract |
The secondary battery includes an electrolyte together with a positive electrode and a negative electrode, and the negative electrode includes a first negative electrode active material, a second negative electrode active material, and a negative electrode binder. The first negative electrode active material includes a central portion containing a material containing silicon as a constituent element, and a coating portion provided on the surface of the central portion and containing a salt compound and a conductive substance. The salt compound contains at least one of a polyacrylate and a carboxymethylcellulose salt, and the conductive substance contains at least one of a carbon material and a metal material. The second negative electrode active material contains a material containing carbon as a constituent element. The negative electrode binder contains at least one of polyvinylidene fluoride, polyimide, and aramid. |