Abstract: An electrochemical device includes a negative electrode sheet. The negative electrode sheet includes a current collector, a first coating layer, and a second coating layer. The first coating layer is located between the current collector and the second coating layer. The second coating layer includes a negative active material. The first coating layer includes a conductive carbon material. The conductive carbon material includes at least one of carbon nanotubes or graphene. Based on a mass of the first coating layer, a mass percent of the conductive carbon material is 20% to 60%. The main material of the first coating layer is at least one of carbon nanotubes or graphene.

Abstract: An electrochemical apparatus includes a positive electrode, a negative electrode, and an electrolyte, the negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, the negative electrode mixture layer includes a negative electrode active substance, there is specific adhesion strength for the negative electrode active substance, and the electrolyte includes propionate. The electrochemical apparatus has improved high-temperature storage performance and overcharge protection performance.

Abstract: A negative electrode plate includes a current collector and a negative electrode active substance layer disposed on the current collector, where the negative electrode active substance layer includes lithium carboxymethyl cellulose, and porosity of the negative electrode plate is greater than or equal to 33%. In this application, the negative electrode active substance layer includes lithium carboxymethyl cellulose, and the porosity of the negative electrode plate is greater than or equal to 33% so that the porosity of the negative electrode plate can be improved without affecting the compacted density of the negative electrode plate, thereby increasing electrolyte retention of the electrochemical apparatus and improving cycling performance of the electrochemical apparatus.