Electrochemical apparatus and electronic apparatus
An electrochemical apparatus includes a positive electrode plate, the positive electrode plate includes a positive electrode active material layer, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a manganese-containing material, and a mass ratio Y of the manganese-containing material to the positive electrode active material ranges from 0.4 to 1. Through control of the mass ratio Y of the manganese-containing material to the positive electrode active material in the positive electrode active material layer, Mn dissolution out of the positive electrode active material layer can be effectively controlled.
1 . An electrochemical apparatus, comprising:
a positive electrode plate, wherein the positive electrode plate comprises a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material, the positive electrode active material comprises a manganese-containing material, and a mass ratio Y of the manganese-containing material to the positive electrode active material ranges from 0.4 to 1;
wherein a surface density of the positive electrode active material layer is X mg/cm 2 , wherein 18≤X≤52; and
wherein an Mn dissolution concentration in the positive electrode plate is Z ppm, wherein Z=(−52.99X+3215.5)×10Y/9, and 204≤Z≤2500.
2 . The electrochemical apparatus according to claim 1 , wherein the manganese-containing material contains lithium manganate.
3 . The electrochemical apparatus according to claim 2 , wherein the lithium manganate contains cubic-crystal-system lithium manganate.
4 . The electrochemical apparatus according to claim 1 , wherein a mass ratio of the manganese-containing material to the positive electrode active material layer ranges from 0.38 to 0.95.
5 . The electrochemical apparatus according to claim 1 , wherein the positive electrode plate further comprises a positive electrode current collector, and the positive electrode active material layer is disposed on one surface or two surfaces of the positive electrode current collector.
6 . The electrochemical apparatus according to claim 1 , wherein the positive electrode active material layer further comprises a conductive agent and a binder.
7 . The electrochemical apparatus according to claim 6 , wherein the conductive agent comprises at least one selected from the group consisting of conductive carbon black, Ketjen black, laminated graphite, graphene, carbon nanotube, and carbon fiber; the binder comprises at least one selected from the group consisting of carboxymethyl cellulose, polyvinylidene fluoride, polyacrylic acid, polyvinylpyrrolidone, polyaniline, polyimide, polyamideimide, polysiloxane, styrene-butadiene rubber, epoxy resin, polyester resin, polyurethane resin, and polyfluorene; and a mass ratio of the positive electrode active material, the conductive agent, and the binder in the positive electrode active material layer is (80-99):(0.1-10):(0.1-10).
8 . The electrochemical apparatus according to claim 1 , wherein the mass ratio Y of the manganese-containing material to the positive electrode active material ranges from 0.4 to 0.7.
9 . An electronic apparatus comprises an electrochemical apparatus, the electrochemical apparatus comprising:
a positive electrode plate, wherein the positive electrode plate comprises a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material, the positive electrode active material comprises a manganese-containing material, and a mass ratio Y of the manganese-containing material to the positive electrode active material ranges from 0.4 to 1;
wherein a surface density of the positive electrode active material layer is X mg/cm 2 , wherein 18≤X≤52; and
wherein an Mn dissolution concentration in the positive electrode plate is Z ppm, wherein Z=(−52.99X+3215.5)×10Y/9, and 204≤Z≤2500.
10 . The electronic apparatus according to claim 9 , wherein the manganese-containing material contains lithium manganate.
11 . The electronic apparatus according to claim 10 , wherein the lithium manganate contains cubic-crystal-system lithium manganate.
12 . The electronic apparatus according to claim 9 , wherein a mass ratio of the manganese-containing material to the positive electrode active material layer ranges from 0.38 to 0.95.
13 . The electronic apparatus according to claim 9 , wherein the positive electrode plate further comprises a positive electrode current collector, and the positive electrode active material layer is disposed on one surface or two surfaces of the positive electrode current collector.
14 . The electronic apparatus according to claim 9 , wherein the positive electrode active material layer further comprises a conductive agent and a binder.
15 . The electronic apparatus according to claim 14 , wherein the conductive agent comprises at least one selected from the group consisting of conductive carbon black, Ketjen black, laminated graphite, graphene, carbon nanotube, and carbon fiber; the binder comprises at least one selected from the group consisting of carboxymethyl cellulose, polyvinylidene fluoride, polyacrylic acid, polyvinylpyrrolidone, polyaniline, polyimide, polyamideimide, polysiloxane, styrene-butadiene rubber, epoxy resin, polyester resin, polyurethane resin, and polyfluorene; and a mass ratio of the positive electrode active material, the conductive agent, and the binder in the positive electrode active material layer is (80-99):(0.1-10):(0.1-10).