Electrochemical device and electronic device including same

An electronic device, comprising an electrochemical device, wherein the electrochemical device comprises a positive electrode plate, a negative electrode plate, and an electrolyte;

• wherein
• the positive electrode plate comprises a positive electrode active material layer, and the negative electrode plate comprises a negative electrode active material layer;
• and
• observed along a thickness direction of the electrochemical device, in a width direction of the negative electrode plate, the negative electrode active material layer comprises two protruding regions not overlapping with the positive electrode active material layer on two sides, and a width of each protruding region is M mm, wherein 0.5≤M≤2;
• and
• the electrolyte comprises a polynitrile compound, and the polynitrile compound comprises a compound represented by formula I-A:
• wherein
• A11, A12, and A13 are independently selected from one of formula (I-A1) or formula (I-A2):
• and
• n is a positive integer from 1 to 8, wherein
• when multiple A11 are present, the multiple A11 may be the same or different;
• R11, R12, and R13 are independently selected from a covalent single bond, substituted or unsubstituted C1-C10 alkylene group, substituted or unsubstituted C2-C10 alkenylene group, substituted or unsubstituted C2-C10 alkynylene group, substituted or unsubstituted C6-C10 arylene group, substituted or unsubstituted C3-C10 cycloalkylene group, or substituted or unsubstituted C1-C10 heterocyclene group, wherein when the groups are substituted, a substituent group is selected from halogen;
• and
• the heterocyclene group comprises heteroalicyclene group and heterocycloarylene group, and heteroatom in the heterocyclene group is selected from at least one of O, N, S, or Si;
• wherein
• represents a bonding site with an adjacent atom;
• based on a mass of the electrolyte, a mass percentage of the polynitrile compound is N %, 0.01≤N≤8;
• and
• 0.01≤M×N<10.