Abstract: The process of the present invention includes introducing a reaction mixture formed by mixing a precipitation agent with an aqueous solution of cobalt sulfate, cobalt chloride or cobalt nitrate into an autoclave or reactor equipped with a refluxing device directly without filtration, and conducting an oxidation reaction at a temperature of 50-100° C. and in the presence of an oxidant to form a tricobalt tetraoxide powder.

Abstract: A process of recovering metals from waste lithium ion/Ni—H/Ni—Cd batteries, wherein the waste batteries are calcined and sieved to generate an ash containing metals and metal oxides. The process includes subjecting the ash to a first dissolution etching treatment, a first filtration treatment to obtain a filtrate containing Cd ions which are crystallized as cadmium sulfate, a second dissolution etching treatment for the filtered solid, and a second filtration treatment to obtain a second filtrate. Fe+3, Al+3 and rare earth metal ions in the second filtrate are precipitated as hydroxides by adding a base to the second filtrate. The remaining solution was extracted and counter-extracted to obtain aqueous solutions of Co and Ni ions, which were subjected separately to a electrolysis to deposit Co and Ni metals. Li ions in the residue solution from the electrolysis of Ni was precipitated as carbonate by adding a soluble carbonate salt.

Abstract: Two concentration techniques, adsorption and electrodialysis, are combined to enrich lithium ions in brine from a level of several ppm to about 1.5%. At beginning brine is subjected to an adsorption, so that Li content is increased to 1200-1500 ppm, followed by two stages of electrodialysis in series to increase Li ions to about 1.5%. Li depleted solution from the second stage of electrodialysis having a Li content of 1200-1500 ppm is recycled to the first stage of electrodialysis as a feed. Li depleted water from the first stage of electrodialysis is subjected to a residue recovery electrodialysis to form a Li enriched solution of 1200-1500 ppm, which is also recycled to the first stage of electrodialysis as a feed. Li depleted solution from the residue recovery electrodialysis is recycled as a feed of the adsorption, so as to sufficiently recover Li ions from brine.

Abstract: A device for preventing electrolyzed products from further reactions having a driver, a cathode, an anode, an electrode axis, an insulation inner tube, an electrode outer tube, and an insulation outer tube, the anode has a plurality of through holes and an axis hole in the center position thereof, the anode is placed above the cathode, the electrode axis is driven to rotate by the driver, the insulation inner tube encasingly covers the electrode axis and goes through the axis hole on the anode, with the bottom end thereof being connected to the cathode, whereas the electrode outer tube encasingly covers the insulation inner tube, with the bottom end thereof being connected to the anode, the insulation outer tube is installed on the anode and covers the outer part of the electrode outer tube, forming a channel between the insulation outer tube and the electrode outer tube, the through holes on the anode are disposed within the area of the channel as the escape paths for the gas product generated at the anode,

Abstract: Two concentration techniques, adsorption and electrodialysis, are combined to enrich lithium ions in brine from a level of several ppm to about 1.5%. At beginning brine is subjected to an adsorption, so that Li content is increased to 1200-1500 ppm, followed by two stages of electrodialysis in series to increase Li ions to about 1.5%. Li depleted solution from the second stage of electrodialysis having a Li content of 1200-1500 ppm is recycled to the first stage of electrodialysis as a feed. Li depleted water from the first stage of electrodialysis is subjected to a residue recovery electrodialysis to form a Li enriched solution of 1200-1500 ppm, which is also recycled to the first stage of electrodialysis as a feed. Li depleted solution from the residue recovery electrodialysis is recycled as a feed of the adsorption, so as to sufficiently recover Li ions from brine.

Abstract: A modified lithium cobalt oxide is useful as a cathode of a lithium ion battery for increasing a charge voltage to 4.4 V. The modified lithium cobalt oxide includes a lithium cobalt oxide particle and an oxide of ZrO2.TiO2.B2O3. Al2O3 or Ga2O3 deposited on a surface of the particle. The modified lithium cobalt oxide is prepared by impregnating the lithium cobalt oxide particle in an aqueous solution containing ions of Zr, Ti, B, Al or Ga, and calcining the impregnated particle.

Abstract: A lithium-containing aqueous solution is contacted with a granular adsorbent of lithium-containing manganese oxide to adsorb lithium ions from the aqueous solution on the adsorbent, wherein an alkali is added to the aqueous solution to raise the pH value thereof to about 10 or above prior to the adsorption, thereby the saturated amount of lithium ions adsorbed per gram of adsorbent is increased from about 6 mg to about 25 mg.

Abstract: A process of recovering metals from waste lithium ion batteries, wherein the waste batteries are calcined and sieved to generate an ash containing metals and metal oxides. The invented process includes subjecting the ash to a dissolution etching treatment, and a filtration treatment, and separately using a membrane electrolysis method to separate out metal copper and cobalt, wherein the acid generated on the cathode side in the electrolysis process can be recovered through a diffusion dialysis treatment. After electrolysis, the solution rich in lithium ion, after precipitating the metal impurities by adjusting the pH value, can be added with a carbonate ion to form a lithium carbonate.