A method of preparing a battery cathode, comprising the steps of: 1) pre-treating a cathode material in a first aqueous solution comprising water and having a pH from about 5.0 to about 8.0 to form a first suspension; 2) drying the first suspension to obtain a pre-treated cathode material; 3) dispersing the pre-treated cathode material, a conductive agent, and a binder material in a second aqueous solution to form a slurry; 4) homogenizing the slurry by a homogenizer to obtain a homogenized slurry; 5) applying the homogenized slurry on a current collector to form a coated film on the current collector; and 6) drying the coated film on the current collector to form the battery cathode at a temperature from about 45 °C to about 100 °C for a time period from about 1 minute to about 30 minutes; wherein the amount of water in the first aqueous solution is at least 50% by volume and wherein the amount of water in the second aqueous solution is at least 90% by volume; wherein the cathode material is a lithium transition metal compound selected from the group consisting of LiCoO 2, LiNiO 2, LiNi x Mn y O 2, Li 1+z Ni x Mn y Co 1-x-y O 2, LiNi x Co y Al z O 2, LiV 2 O 5, LiTiS 2, LiMoS 2, LiMnO 2, LiCrO 2, LiMn 2 O 4, LiFeO 2, and combinations thereof, wherein each x is independently from 0.3 to 0.8; each y is independently from 0.1 to 0.45; and each z is independently from 0 to 0.2; wherein the conductive agent is selected from the group consisting of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanoplatelets, carbon fibres, carbon nano-fibers, graphitized carbon flake, carbon tubes, carbon nanotubes, activated carbon, mesoporous carbon, and combinations thereof; and wherein the binder material is selected from the group consisting of styrene-butadiene rubber, carboxymethyl cellulose, polyvinylidene fluoride (PVDF), acrylonitrile copolymer, polyacrylic acid, polyacrylonitrile, poly(vinylidene fluoride)-hexafluoropropene (PVDF-HFP), latex, a salt of alginic acid, and combinations thereof. 1) pre-treating a cathode material in a first aqueous solution comprising water and having a pH from about 5.0 to about 8.0 to form a first suspension; 2) drying the first suspension to obtain a pre-treated cathode material; 3) dispersing the pre-treated cathode material, a conductive agent, and a binder material in a second aqueous solution to form a slurry; 4) homogenizing the slurry by a homogenizer to obtain a homogenized slurry; 5) applying the homogenized slurry on a current collector to form a coated film on the current collector; and 6) drying the coated film on the current collector to form the battery cathode at a temperature from about 45 °C to about 100 °C for a time period from about 1 minute to about 30 minutes; wherein the amount of water in the first aqueous solution is at least 50% by volume and wherein the amount of water in the second aqueous solution is at least 90% by volume; wherein the cathode material is a lithium transition metal compound selected from the group consisting of LiCoO 2, LiNiO 2, LiNi x Mn y O 2, Li 1+z Ni x Mn y Co 1-x-y O 2, LiNi x Co y Al z O 2, LiV 2 O 5, LiTiS 2, LiMoS 2, LiMnO 2, LiCrO 2, LiMn 2 O 4, LiFeO 2, and combinations thereof, wherein each x is independently from 0.3 to 0.8; each y is independently from 0.1 to 0.45; and each z is independently from 0 to 0.2; wherein the conductive agent is selected from the group consisting of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanoplatelets, carbon fibres, carbon nano-fibers, graphitized carbon flake, carbon tubes, carbon nanotubes, activated carbon, mesoporous carbon, and combinations thereof; and wherein the binder material is selected from the group consisting of styrene-butadiene rubber, carboxymethyl cellulose, polyvinylidene fluoride (PVDF), acrylonitrile copolymer, polyacrylic acid, polyacrylonitrile, poly(vinylidene fluoride)-hexafluoropropene (PVDF-HFP), latex, a salt of alginic acid, and combinations thereof.