| abstract |
The present application relates to an electrochemical device with safety performance. Specifically, the present application provides an electrochemical device, which includes: a negative electrode sheet, the negative electrode sheet includes a negative electrode active material layer; a separator; and a polymer layer, wherein the polymer layer is arranged on the Between the negative electrode active material layer and the separator, the polymer layer includes polymer particles, and the sphericity of the polymer particles in the embodiment of the present application is about 0.70-about 1.0. The present application effectively protects the negative electrode by arranging a non-conductive or poorly conductive inactive material (for example, non-conductive polymer particles) between the negative electrode active material layer and the separator, ensuring that the electrochemical device is subjected to No internal short circuit will be generated when the external force is impacted, nailed or squeezed, which will cause the electrochemical device to fail. |