Electrode, manufacturing method thereof and electrochemical device

The invention relates to an electrode, a manufacturing method thereof and an electrochemical device, the electrode comprises a current collector and an active layer, and the active layer is connected with the current collector; wherein the active layer comprises a conductive layer and a plurality of PN junctions mixed in the conductive layer, each PN junction comprises P-type silicon and N-type silicon connected with the P-type silicon, the direction of the P-type silicon pointing to the N-type silicon is a first direction, and in the plurality of PN junctions, the components of a preset number of PN junctions in the first direction coincide with the normal direction of the current collector. The active layer comprises the conductive layer and the PN junctions mixed in the conductive layer, and the components of the preset number of PN junctions in the first direction coincide with the normal direction of the current collector, so that the charging and discharging performance and the heat dissipation performa