Process for the preparation of battery precursors
A technology of lithium-ion battery and heat treatment method, which is used in the field of preparing battery precursors, can solve the problems of high cost and expensive extraction steps
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Embodiment 1
[0073] End-of-life cells were recycled in 60 liter alumina crucibles. The end-of-life cell contained 10 wt% Al, 2 wt% Fe, 4 wt% Mn, 4 wt% Co, 9 wt% Cu, 13 wt% Ni, 2.5 wt% Li, 25 wt% C. The remainder contains, for example, elements such as hydrogen, oxygen and fluorine.
[0074] The starting slag was heated to a temperature of 1450°C using an induction furnace. Once the temperature was reached, the end-of-life battery and flux mixture was gradually added to the liquid slag over a period of 2 hours. During this time, 50kg of batteries were added along with 10kg of limestone and 5kg of sand. For the starting material including the described end-of-life battery, starting slag and flux, the Li:M ratio was 1.53. During the loading of the feed, O was blown over the bath at a rate of 220 L / h 2 , to burn any metallic Al and carbon in the battery. Once the final addition was complete, CO was blown through the bath at a rate of 300 L / h for 1 hour to achieve the desired degree of red...
Embodiment 2
[0086] The mechanically pretreated cathode foil production waste, called black matter, was first thermally pretreated in the presence of reducing agent C to remove Li before leaching. The black matter contains 33% Ni, 11% Co, 10% Mn, <0.1% Cu, <0.1% Fe, 0.4% Al, 6.1% Li. The remainder contains, for example, elements such as oxygen, carbon and fluorine. The Li:M ratio of the starting material was 0.94.
[0087] 300 g of black matter (mechanically pretreated positive electrode foil production waste with the above composition) was mixed with 15.6 g of carbon and 244.8 g of CaCl 2 2H 2 O mix. The mixture was placed in a tray and heated to a temperature of 700 °C in an electric furnace while using N 2 The flow continues to purge the furnace. A temperature of 700° C. was maintained for a period of 6 hours. During this period, Ni oxides, Mn oxides, and Co oxides are (partially) reduced, and water-soluble Li salts, namely Li 2 CO 3 and / or LiCl. 6 hours later, at N 2 The furn...
Embodiment 3
[0095] 200g nickel-cobalt-aluminum (NCA) cathode production waste was processed. Production waste contains 48% Ni, 9% Co, <0.1% Mn, 2% Al, 7% Li. The remainder contains, for example, elements such as oxygen. The Li:M ratio of the starting material was 1.04.
[0096] 200 g of cathode production waste was added to a 2 L reactor with 1 L of water. The mixture was stirred and heated to a temperature of 80°C on a hot plate. Add 220 mL of sulfuric acid with a concentration of 987 g / L within 6 hours. Under this condition, Li dissolves, but trivalent Co and Ni do not. After six hours, the solid-liquid mixture was filtered on a Buchner funnel. About 1.1 L of filtrate was recovered. By this operation, most of the lithium is leached and is present in the filtrate. 107 g of a Li-poor residue rich in Ni and Co were obtained. The composition of the filtrate and the dried residue can be seen in Table 3.1. The lithium removal rate in the selective Li leaching step is greater than 99%...
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