Preparation method of nickel cobalt lithium manganate standard sample
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A technology of nickel-cobalt lithium manganate and standard samples, which is applied in the preparation of test samples, material weighing, material excitation analysis, etc., can solve the problems of uncontrollable preparation and low content of impurity elements, and ensure uniformity And stability, good uniformity, good stability
Active Publication Date: 2022-07-12
GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD +1
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The content of each element in the standard sample obtained by this method is close to the actual product content, and the content of impurity elements is low, so it is impossible to achieve the controllable preparation of each definite value element in the standard sample
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[0030] The preparation method of nickel cobalt lithium manganate standard sample of the present invention comprises the following steps:
[0031] 1) According to the design of the proportion of ingredients, take by weighing an appropriate amount of nickel nitrate, cobalt nitrate, manganese nitrate, magnesium nitrate, calcium nitrate, copper nitrate, ferric nitrate, zinc nitrate and zirconium nitrate, add them into deionized water and stir, and the concentration is as follows: 1.0mol / L~2.0mol / L mixed solution;
[0032] Taking zirconium-doped 811 nickel cobalt lithium manganate as the matrix, the composition ratio of the reaction raw materials can be referred to in Table 1; the ratio in the table is the mass percentage of the metal element, and the oxygen content is the balance;
[0033] 2) Add an appropriate amount of silicon-containing solution to the sodium hydroxide solution with a concentration of 1.0 mol / L to 5.0 mol / L, and stir evenly; the medium of the silicon-containing...
Embodiment 1
[0039] 1) According to the composition ratio design, weigh an appropriate amount of analytically pure nickel nitrate, cobalt nitrate, manganese nitrate, magnesium nitrate, calcium nitrate, copper nitrate, ferric nitrate, zinc nitrate and zirconium nitrate, add them to deionized water, stir, and mix. into a 1.0 mol / L mixed metal ion solution; the mass percentage of metal elements in the nickel cobalt lithium manganate matrix is shown in Table 2. Oxygen element content is the balance. The mass percentage content of each raw material is nickel nitrate 77.84%, cobalt nitrate 10.02%, manganese nitrate 11.79%, magnesium nitrate 0.066%, calcium nitrate 0.044%, copper nitrate 0.016%, iron nitrate 0.022%, zinc nitrate 0.022% and zirconium nitrate 0.18%.
[0040] Table 2 Composition ratio table (wt%) of reaction raw materials in Example 1
[0041]
[0042]
[0043] 2) 50 mL of sodium silicate solution containing silicon concentration of 10000 μg / mL was added to 500 mL of 2.0 m...
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Abstract
The invention relates to a preparation method of a nickel cobalt lithium manganate standard sample, and belongs to the field of chemical standard sample preparation. The preparation method comprises the following steps: weighing nickel nitrate, cobalt nitrate, manganese nitrate, magnesium nitrate, calcium nitrate, copper nitrate, ferric nitrate, zinc nitrate and zirconium nitrate according to the component proportion, adding into deionized water, and stirring to prepare a mixed solution; adding the silicon-containing solution into the sodium hydroxide solution, and uniformly stirring; carrying out a co-precipitation reaction on the mixed solution, a silicon-containing sodium hydroxide solution and ammonia water to obtain a nickel cobalt lithium manganate precursor; uniformly mixing the nickel cobalt lithium manganate precursor with lithium carbonate and sodium carbonate, sintering in a tubular furnace, cooling at room temperature, grinding, sieving and uniformly mixing; adopting a chemical method and an ICP (Inductively Coupled Plasma) method to detect each constant-value component, and carrying out primary uniformity detection on each constant-value element; and subpackaging under the protection of nitrogen. The method is simple in preparation process and low in cost, and the obtained standard sample is good in uniformity and stability; the method can be used for calibrating instruments and evaluating and analyzing methods.
Description
technical field [0001] The invention belongs to the field of chemical standard sample preparation, in particular to a preparation method of a nickel cobalt lithium manganate standard sample. Background technique [0002] New energy vehicles are an effective way to deal with the energy crisis, environmental pollution and the transformation and upgrading of the automobile industry. As a key material for new energy vehicles, lithium-ion battery cathode materials have always been a key factor affecting and restricting the cruising range, service life, safety and price of new energy vehicle batteries. At present, the industrialized lithium ion battery cathode materials mainly include lithium cobalt oxide (LCO), lithium manganate (LMO), nickel cobalt manganese ternary material (NCM), lithium iron phosphate (LEP) and so on. Among them, nickel cobalt lithium manganate ternary materials are increasingly favored by the market due to their advantages of large specific capacity, high e...
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