Method for detecting content of element phosphorus in carbon composite lithium iron phosphate positive electrode material
A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of removing certain components, weighing, and preparation of test samples to achieve accurate detection.
Inactive Publication Date: 2018-08-03
SHANXI CHANGZHENG POWER TECH CO LTD
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AI Technical Summary
Problems solved by technology
Phosphorus is the main element in the material, the conventional ICP test has certain limitations
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0028] Prepare experimental reagents: sodium molybdate (AR); citric acid (AR); nitric acid: 50% (V / V) nitric acid solution; quinoline; acetone; hydrochloric acid: 20% (V / V) hydrochloric acid solution;
[0029] 1: Preparation of quinolimonone solution:
[0030] a. Dissolve 70g of sodium molybdate in 100ml of water;
[0031] b. Dissolve 60g of citric acid in 150ml of water and 85ml of nitric acid;
[0032] c. Pour solution a into solution b under stirring and mix well;
[0033] d. Add 35ml nitric acid and 5ml quinoline to 100ml water;
[0034] e. Pour solution d into solution c, mix well, let stand overnight, filter with filter paper, add 280ml acetone to the filtrate, and dilute to 1000ml with deionized water. The solution is stored in a polyethylene bottle and placed in a dark place, protected from light and heat.
[0035] Two: Inspection process
[0036] 1. Weigh 0.04g sample and record it as m, place it in a 100ml beaker, add a small amount of water to moisten it, add 5...
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The invention discloses a method for detecting the content of element phosphorus in a carbon composite lithium iron phosphate positive electrode material. The method comprises the following steps: weighing samples to be detected; putting the samples to be detected into a container containing hydrochloric acid with a concentration of 20% (V / V), carrying out heating until the samples to be detected are completely dissolved, fixing a volume by using nitric acid with a concentration of 50% (V / V) and water, carrying out heating in a water bath, adding an excess quimociac solution, and carrying out heating and heat preservation in a water bath to obtain a supernatant and a precipitate; carrying out cooling to room temperature after a reaction is completed; drying a sintered-glass filter funnelto a constant weight, then transferring the supernatant and the precipitate into the sintered-glass filter funnel for filtration so as to obtain the precipitate; subjecting the precipitate to washingwith water, drying and cooling, and carrying out weighing when the precipitate has a constant weight; carrying out blank tests at the same time, adding hydrochloric acid into the samples, carrying out heating and dissolving, adjusting the pH value of a solution formed after complete dissolving by using nitric acid until an appropriate acid-base environment is formed, carrying out heating and boiling, adding a quimociac solution, and carrying out heating and heat preservation in a water bath so as to form another precipitate; and subjecting the precipitate to washing, filtering, drying and weighing, and calculating the content of elemental phosphorus. The method provided by the invention can quickly and accurately detect the content of elemental phosphorus.
Description
technical field [0001] The invention relates to a method for detecting the content of phosphorus element, in particular to a method for detecting the content of phosphorus element in a carbon-composite lithium iron phosphate cathode material. Background technique [0002] As a chemical power system with high energy density, high output voltage, excellent cycle performance, no memory effect, and environment-friendly, lithium-ion battery has good economic benefits, social benefits and strategic significance, and is widely used in mobile communications and digital products , electric vehicles and many other fields. At present, as the application fields of lithium-ion batteries become more and more extensive, different users have different requirements for lithium-ion batteries. In the field of low-temperature lithium batteries, the capacity requirements for low-temperature discharge are getting higher and higher. As an important component that affects the performance of lithi...
Claims
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IPC IPC(8): G01N5/04G01N1/44
CPCG01N5/04G01N1/44
Inventor 白玉龙
Owner SHANXI CHANGZHENG POWER TECH CO LTD