High-power multi-component material and preparation method thereof
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A high-power, multi-dimensional technology, applied in chemical instruments and methods, electrical components, inorganic chemistry, etc., can solve problems such as structural peeling, price rise, collapse, etc.
Pending Publication Date: 2020-12-08
TIANJIN ENERGIES
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[0005] (1) Power materials are mostly secondary agglomerated balls, which are prone to structural peeling and collapse from the grain boundaries under high-voltage or high-current charging and discharging conditions, causing a large capacity decay of the battery during high-temperature cycling;
[0006] (2) The power performance is poor and cannot meet the needs of the existing battery cell development;
H
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Embodiment 1
[0035] Prepare 20L of nickel-cobalt-manganese salt solution with a concentration of 2M, the molar ratio of nickel-cobalt-manganese is 8.2:1:0.8, add 25g of tin chloride to the nickel-cobalt-manganese salt solution, and continue stirring with 35g of KN-B additive to obtain a mixed solution.
[0036] Add 5L of deionized water and 5g of KN-B into the reactor under nitrogen protection, add the prepared mixed solution at a constant speed of 1L / h at a speed of 600rpm, and at the same time control the pH value at 10.6±0.02 by adding ammonia water to the sodium hydroxide solution until the mixed solution is completely poured in to obtain a solid-liquid mixture.
[0037] The solid-liquid mixture was separated by centrifugal filtration, washed to neutrality and then dried at 220°C for 4 hours. After sieving, the 8-series high-power ternary precursor material of the present invention can be obtained.
[0038] Such as figure 1 As shown, the primary particle size of the material is 0.1-0...
Embodiment 2
[0040] Prepare 20L of nickel-cobalt-manganese salt solution with a concentration of 2M, the molar ratio of nickel-cobalt-manganese is 55:15:30, add 30g KN-R and 25g niobium nitrate, and keep stirring to obtain a mixed solution.
[0041] Add 5L of deionized water and 5g of KN-R into the nitrogen-protected reactor, and add the prepared mixed solution at a constant speed of 1L / h at a speed of 800rpm, and at the same time control the pH value at 10.95±0.02 by adding ammonia water to the sodium hydroxide solution , until the salt solution is completely injected, and a solid-liquid mixture is obtained.
[0042]The solid-liquid mixture was separated by centrifugal filtration, washed to neutrality and then dried at 280°C for 4 hours. After sieving, the high-power ternary precursor material of the present invention can be obtained. Mix the precursor and lithium carbonate uniformly at a molar ratio of 1:1.03, bake in an air atmosphere furnace at 750 degrees for 6 hours, and bake at 920...
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Abstract
The invention provides a high-power type multi-component material and a preparation method thereof, and the molecular formula of the high-power type multi-component material is as follows: LiNi1-a-bCoaMnbO2; 1-a-b is greater than or equal to 0.2 and is less than 1; 0.5> a; b> 0; the morphology features are as follows: the primary particle diameter is 0.2-1.5 mu m, the high-power type multi-component material is a hollow structure with the particle size D50 of internal multiple pores of 4-10 mu m, M elements are doped in the particles, and M is one or a combination of Ce, Nd, Eu, Er, Ta, W andSn. The high-power type multi-component material is a ternary material with a special microstructure, a primary particle polymerized secondary particle precursor with more pores inside is prepared through special process control, and an internal porous multi-element positive electrode material with a primary particle coating structure can be formed in a roasting process after the precursor is mixed with lithium salt; the secondary particle ternary material with high power and long service life can be obtained while the advantages of low cobalt content and low cost are guaranteed, the primary particle coating technology is used, the service life of the roasted material is effectively prolonged, meanwhile, the secondary sintering process is reduced, and the production cost of the material isgreatly reduced.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion cathode materials, and in particular relates to a high-power multi-element material and a preparation method. Background technique [0002] Lithium-ion battery is a kind of high-energy battery that has developed rapidly in the past ten years. Due to its advantages of high voltage, high specific energy, long cycle period, and low environmental pollution, it has become a key direction for the development of my country's new energy industry. . The positive electrode material is an important part of lithium-ion batteries, and it is also the part with the highest cost ratio in lithium-ion batteries. [0003] At present, ternary materials have been widely concerned in the commercial application of new energy vehicles due to their high specific energy density and long cruising range. And with the continuous decline of battery manufacturing costs, the proportion of ternary material power batteries us...
Claims
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