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A kind of nickel-based positive electrode material and its preparation method and battery
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A positive electrode material, nickel-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as uneven distribution of elements, and achieve the effects of improved cycle performance, small particle size, and shortened diffusion distance
Active Publication Date: 2015-09-30
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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This method is simple and easy, and the shape is easy to control, but dry mixing is easy to cause uneven distribution of elements
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specific Embodiment 1
[0047] Preparation of LiNi by Lithium Carbonate, Manganese Carbonate, Cobalt Tetroxide and Nickel Oxide as Main Raw Materials 0.5 co 0.28 mn 0.16 Si 0.03 Zr 0.03 o 1.98 f 0.04 . 363.2g of lithium carbonate, 10.6g of lithium fluoride, 382.1g of nickel oxide, 230.0g of cobalt tetroxide, 32.9g of zirconia, 18.4g of silicon dioxide, 188.2g of manganese carbonate, mixed with 6000ml of absolute ethanol, and placed in a coarse grinding machine Roughly grind for 200 minutes, move the slurry into a fine grinder, grind for 200 minutes, take out the material from the fine grinder, and dry at 80°C. The powder obtained after drying was calcined at 900°C for 12 hours, and then cooled with the furnace.
specific Embodiment 2
[0048] Preparation of LiNi by Lithium Carbonate, Manganese Carbonate, Cobalt Tetroxide and Nickel Oxide as Main Raw Materials 0.5 co 0.28 mn 0.16 Si 0.03 Zr 0.03 o 1.98 f 0.04 . 363.2g of lithium carbonate, 10.6g of lithium fluoride, 382.1g of nickel oxide, 230.0g of cobalt tetroxide, 32.9g of zirconia, 18.4g of silicon dioxide, and 188.2g of manganese carbonate were added to the pre-grinding tank, and 3000ml of absolute ethanol was added, and the Pre-grind on a rod mill for 24 hours. Take the pre-grinded material out of the pre-grinding tank, add 6000ml of absolute ethanol, and grind it on a coarse grinder for 200 minutes. After mixing the raw materials evenly, take out the material from the coarse grinder and dry it at 80°C. The powder obtained after drying was calcined at 900°C for 12 hours, and then cooled with the furnace.
specific Embodiment 3
[0049] Preparation of LiNi by Lithium Carbonate, Manganese Carbonate, Cobalt Tetroxide and Nickel Oxide as Main Raw Materials 0.5 co 0.28 mn 0.16 Si 0.03 Zr 0.03 o 1.98 f 0.04 . 363.2g of lithium carbonate, 10.6g of lithium fluoride, 382.1g of nickel oxide, 230.0g of cobalt tetroxide, 32.9g of zirconia, 18.4g of silicon dioxide, and 188.2g of manganese carbonate were added to the pre-grinding tank, and 3000ml of absolute ethanol was added, and the Pre-grind on a rod mill for 24 hours. Take out the pre-grinded material, add 6000ml of absolute ethanol, grind it on a coarse grinder for 200 minutes, transfer the material into a fine grinder, grind it finely for 200 minutes, and dry the finely ground mixture at 80°C. The powder obtained after drying was calcined at 900°C for 12 hours, and then cooled with the furnace.
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Abstract
The invention relates to a nickel-based positive electrode material, and a preparation method thereof and a battery. The composition of the nickel-based positive electrode material is LiaNibCocMndMeM'fO2-g / 2Fg (M is at least one selected from Ti, Zr, Al, Fe, Cr, Si, and Cu; M' is at least one selected from Mg, Ca, Sr, Ba, and W; a is no smaller than 0.95 and no greater than 1.2; b is no smaller than 0.2 and no greater than 0.9; c is no smaller than 0 and no greater than 0.4; d is no smaller than 0 and no greater than 0.4; e+f is greater than 0.05and no greater than 0.2; and g is greater than 0.02 and no greater than 0. 1). Anions and cations are used in co-doping. With a synergistic effect, nickel-based positive electrode material capacity, structural stability and circulation performance are greatly improved. The preparation method at least comprises the 4 steps that: (1) corresponding raw materials are weighed according to the molar ratio consistent with LiaNibCocMndMeM'fO2-g / 2Fg; (2) the raw materials are subjected to wet grinding; (3) slurry obtained by grinding is dried; and (4) the dried material is subjected to solid-phase synthesis under a temperature of 500-1100 DEG C. With the process, the raw materials can be more uniformly dispersed, and the obtained product has the advantages of high capacity and good circulation performance. The process is simple, and has the advantages of low cost and suitability for large-scale industrialized productions. With the process, problems such as complicated process and acid and alkali pollution of a wet chemical precursor preparation method are avoided. The invention also relates to a battery with the material as an active substance.
Description
technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, a preparation method thereof and a battery, and belongs to the technical field of energy materials. Background technique [0002] In 1999, LiNi 1-x-y co x mn y o 2 (0<x<0.5, 0<y<0.5) (nickel-based cathode material) was reported for the first time. This material significantly improves the capacity of the material by introducing nickel ions, and reduces lithium-nickel cation mixing by introducing cobalt ions. Improve the safety of materials by introducing manganese ions. The material combines LiCoO 2 , LiNiO 2 , LiMnO 2 The advantages of the three classes of materials are considered to be the best able to replace LiCoO 2 One of the cathode materials. However, the radii of lithium ions and divalent nickel ions in this material are close to each other, which makes it easy to mix and arrange, which makes the structural stability worse, and thus the cycle pe...
Claims
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