Method for measuring carbon content in lithium iron phosphate

Abstract

A method for measuring carbon content in lithium iron phosphate includes steps of (1), firing a clean container at the temperature ranging from 800 DEG C to 1000 DEG C until the weight of the container is constant, taking out the container and placing the container in a dryer when the container is cooled and the temperature of the container ranges from 200 DEG C to 300 DEG C, and weighing the container and recording the weight of the container as m0 when the temperature of the container reaches the room temperature; (2), weighing to-be-measured materials and placing the to-be-measured materials in the dried container, placing the container with the to-be-measured materials into a vacuum drying oven to dry the container with the to-be-measured materials at the temperature ranging from 120 DEG C to 150 DEG C for 2-3 hours, taking out the container with the to-be-measured materials from the drying oven after drying is completed, the container with the to-be-measured materials is cooled and the temperature of the container with the to-be-measured materials reaches the room temperature, metering the mass of the container and the mass of the materials and recording the sum of the masses as m1; (3), firing the container and the materials in an environment with the temperature ranging from 800 DEG C to 1000 DEG C for 2 to 3 hours after weighing is completed, taking the container and the materials out of the environment and placing the container and the materials in the dryer after the container with the materials is cooled and the temperature of the container with the materials ranges from 200 DEG C to 300 DEG C, cooling the container with the materials until the temperature of the container and the temperature of the materials reach the room temperature, weighing the container and the materials and recording the weight of the container and the materials as m2; and (4), computing the carbon content of the materials according to a formula. In the formula, the m0 is the weight of the empty container, the m1 is the total weight of the materials and the container after the materials and the container are dried, and the m2 is the total weight of the materials and the container after the materials and the container are fired.

Description

technical field [0001] The invention discloses a method for detecting carbon content in a compound, in particular to a method for detecting carbon content in lithium iron phosphate, a cathode material of a lithium ion battery. Background technique [0002] Analytical methods for carbon content are often required in the production of chemical materials. As lithium-ion batteries are more and more widely used in people's lives, lithium-ion battery materials have also been greatly developed, especially for lithium iron phosphate battery cathode materials. Lithium iron phosphate cathode materials are because of their good safety and environmental protection , cycle stability, good high-temperature performance and other advantages have attracted widespread attention, but carbon coating is often required for modification due to its low electronic conductivity. However, the difference in carbon content in lithium iron phosphate will have a huge impact on the performance of the ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the above-mentioned prior art that the detection cost of carbon content in lithium iron phosphate is high and errors are prone to occur, the present invention provides a new method for measuring the carbon content in lithium iron phosphate, using phosphoric acid Thermogravimetric analysis of lithium iron in air, using the weight difference before and after burning to calculate the carbon content in lithium iron phosphate

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