ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE CONTAINING SAME

An electrochemical device, including a positive electrode. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer includes particles A and particles B. A circularity of a particle A is R, a cross-sectional area of the particle A is S, a circularity of a particle B is R, a cross-sectional area of the particle B is S, where R