▎ 摘　　要

NOVELTY - Pseudocapacitive aqueous calcium-ion battery cathode, prepared by adding cathode material of pseudocapacitive calcium ion battery, acetylene black, and polyvinylidene fluoride into absolute ethanol according to the mass ratio of 8:1:1, and fully grinding to obtain a uniform slurry, coating the slurry on carbon paper, drying at 100℃ under vacuum, and cutting to obtain the cathode of the pseudocapacitive aqueous calcium-ion battery. The cathode material of the capacitive calcium-ion battery comprises silicon-doped graphene that allows reversible chemisorption/desorption of the cation calcium (II) ion constituting the calcium salt, and the graphene is single-layer graphene, and the silicon doping content of the silicon-doped graphene is 2.68 at.%. USE - The pseudocapacitive aqueous calcium-ion battery cathode is useful in the prepared aqueous calcium-ion battery (claimed). ADVANTAGE - The aqueous calcium ion battery cathode has high energy density and power density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for use of a pseudocapacitive aqueous calcium-ion battery cathode in the prepared aqueous calcium-ion battery.