Testing method of content of nickel in cathode material for lithium ion battery

Abstract

The invention discloses a testing method of the content of nickel in a cathode material for a lithium ion battery. The testing method comprises the following steps: S01: weighing a cathode material for a to-be-tested lithium ion battery, adding acid for dissolution and heating for evaporation and realizing constant volume; S02: adding concentrated nitric acid into test fluid prepared in S01, then fractionally adding an excessive amount of potassium chlorate or sodium chlorate and filtering after a reaction is completed, so as to obtain filtrate and manganese dioxide sediment; S03: quantitatively measuring the filtrate in S02, adding water, ammonium chloride solution and tartaric acid solution, uniformly stirring the mixture and performing a complete reaction; S04: filtering the mixed solution to obtain filtrate and nickel dimethylglyoxime sediment, drying to constant weight and weighing; S05: calculating the content of a nickel element. The invention provides the testing method, so that the problem of an error existing in a process of testing the content of nickel in the cathode material for the lithium ion battery by using a spectrophotometric method and a chemical titration method can be solved, and the accurate numerical value of the content of nickel in the cathode material can be obtained.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a method for testing the nickel content in the positive electrode material of the lithium ion battery. Background technique [0002] Lithium-ion battery is a new type of secondary battery based on lithium battery, which has the advantages of high energy storage density, high energy efficiency, long cycle life, low self-discharge rate, and wide operating temperature range. In 1980, Goodenough first studied the possibility of using lithium cobalt oxide as the positive electrode material of lithium-ion batteries. In 1990, Sony Corporation of Japan released the first commercial lithium-ion battery using lithium cobalt oxide as the positive electrode material. After decades of development, the positive electrode materials currently developed in the existing technology include ternary compounds such as lithium manganese oxide, lithium iron phosphate, and lithium cobalt oxide, as we...

AI Technical Summary

Problems solved by technology

Although the above chemical analysis method is the most rigorous and accurate in theory, in actual operation, due to the complex composition of the positive electrode material, the color itself after dissolution is relatively dark, and the final color of the test solution titrated is brown. It is not obvious after the overdose, and it is difficult to determine the final titration end point with a uniform standard by the naked eye observation of testers. Absorptiometry test results are similar and cannot be accepted

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