Doped large-particle cobalt carbonate and preparation method thereof
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A large particle, cobalt carbonate technology, applied in the direction of cobalt carbonate, etc., to achieve good growth consistency, reduce aluminum segregation, and slow sedimentation
Active Publication Date: 2021-08-27
HUNAN SHANSHAN ENERGY TECH CO LTD
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[0006]
The technical problem to be solved by the present invention is the efficient preparation and high aluminum doping of cobalt carbonate precursors, overcome the deficiencies and defects mentioned in the above background technology, and provide a kind of narrow particle size distribution, not easy to produce segregation, high tap density Doped large particle cobalt carbonate and preparation method thereof
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Embodiment 1
[0056] A doped large particle cobalt carbonate, the molecular formula is [CoCO 3 ] 0.987 ·[Co 6 Al 2 CO 3 (OH) 16 4H 2 O] 0.013 ,Such as figure 1 , figure 2 As shown, its morphology is spherical secondary particles composed of nano-scale primary conical particles, and the range of particle size distribution of the spherical secondary particles is as follows: (D90-D10) / D50=0.4.
[0057] figure 1 It is the SEM picture of the doped large-grained cobalt carbonate enlarged 1000 times in Example 1. It can be clearly seen that the secondary particles of the doped large-grained cobalt carbonate are uniform spherical particles, and no filamentous or flake Al segregation is found on the surface .
[0058] figure 2 It is the SEM image of the doped large-grained cobalt carbonate enlarged 20,000 times in Example 1, and it can be clearly seen that the primary particle of the doped large-grained cobalt carbonate is in the shape of a nanoscale cone.
[0059] D50=19.31μm, D10=16....
Embodiment 2
[0077] A doped large particle cobalt carbonate, the molecular formula is [CoCO 3 ] 0.989 ·[Co 6 Al 2 CO 3 (OH) 16 4H 2 O] 0.011 , the shape of which is spherical secondary particles composed of nano-scale primary conical particles, and the range of particle size distribution of the spherical secondary particles is as follows: (D90-D10) / D50=0.404.
[0078] D50=19.28μm, D10=16.11μm, D90=23.90μm of the above-mentioned large-grained cobalt carbonate, and the tap density is 1.90g / cm 3 . The large particle cobalt carbonate crystal structure is characterized by XRD, the half peak width of the 012 peak is 0.214, the half peak width of the 104 peak is 0.192, the ratio of the half peak width of the 012 peak and the 104 peak is 1.115, and the intensity ratio of the 012 peak and the 104 peak is 0.322.
[0079] A preparation method of high-voltage doped large particle cobalt carbonate, comprising the following steps:
[0080] S1. Nucleation:
[0081] Cobalt chloride solution 108...
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Abstract
The invention relates to doped large-particle cobalt carbonate and a preparation method thereof. The large-particle cobalt carbonate is doped with metal elements, primary particles are conical in morphology and form spherical secondary particles, and the particle size distribution range of the secondary particles is that (D90-D10) / D50 is larger than or equal to 0.3 and smaller than or equal to 0.5; and the preparation method comprises the following steps: nucleation, concentration, growth in a seed crystal kettle, and growth of the seed crystal in different kettles. The doped large-particle cobalt carbonate is high in crystallinity, beneficial to uniform distribution of doped element aluminum, high in tap density, narrow in particle size distribution and beneficial to reduction of aluminum segregation of small particles; and according to the preparation method, the D50 rising speed and the solid content rising speed are strictly controlled, uniform growth of cobalt carbonate particles is guaranteed by adjusting the flow and the rotating speed in different solid content intervals, the concentration process greatly saves the standing waiting time, the efficiency is high, and the obtained product is good in performance and has a wide market prospect.
Description
technical field [0001] The invention belongs to the technical field of cobalt carbonate, and in particular relates to a doped large-grain cobalt carbonate and a preparation method thereof. Background technique [0002] The energy density of lithium cobalt oxide products in the field of capacity type 3C is getting higher and higher, which are mainly used in mobile phones / notebooks / tablets and other product fields; at present, the capacity and energy density of lithium cobalt oxide materials are mainly increased by increasing their charging cut-off voltage. However, with the increase of the charging cut-off voltage, the deintercalation of lithium ions will be intensified, the crystal structure will change or even collapse, and the cycle performance under high voltage will be deteriorated. The traditional process is mainly to stabilize the crystal structure and improve the cycle performance by high-temperature solid-phase Al doping with tricobalt tetroxide, lithium carbonate an...
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