Battery, battery pack, an electronic device, an electric vehicle, a power storage device and power system

Battery, a positive electrode active material layer is formed including a positive active material on at least one surface of the positive electrode current collector, a negative electrode the negative electrode active material layer is formed containing a negative active material on at least one surface of the negative electrode current collector comprises a separator, and an electrolyte containing solid particles. Capacity area density of the negative electrode active material layer (mAh / cm Figure 2