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Method for detecting content of nickel, cobalt and manganese in ternary material or ternary precursor

A technology of ternary materials and precursors, applied in the direction of electrochemical variables of materials, analysis of materials by chemical reactions, and material analysis by observing the influence of chemical indicators, etc., can solve the problems of identification difficulties, increased filtrate, nickel Difficulty in shaking the Erlenmeyer flask, etc.

Inactive Publication Date: 2018-06-29
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the separation of manganese and cobalt under the condition of ammonia water is the key point. In order to achieve complete separation, it is necessary to rinse the precipitation with ammonia water many times, which will cause the increase of filtrate and cause certain difficulties for the follow-up titration of nickel content. The color of the filtrate after filtration is purple, which also brings some difficulties to the identification of the end point

Method used

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  • Method for detecting content of nickel, cobalt and manganese in ternary material or ternary precursor
  • Method for detecting content of nickel, cobalt and manganese in ternary material or ternary precursor
  • Method for detecting content of nickel, cobalt and manganese in ternary material or ternary precursor

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Embodiment approach

[0101] According to a preferred embodiment of the present invention, the molar amount of nickel in the ternary material or ternary precursor can be obtained by using n(Ni / Co / Mn) and n(Mn / Co) for differential calculation.

[0102] In a further preferred embodiment, the molar amount of nickel in the ternary material or the ternary precursor is obtained as follows:

[0103] n(Ni)=n(Ni / Co / Mn)-n(Mn / Co) Formula (4).

[0104] Wherein, n (Ni) is the molar weight of nickel in the ternary material or ternary precursor that the quality that takes in step 1 ' is m.

[0105] In a further preferred embodiment, the mass percentage of nickel in the ternary material or the ternary precursor is obtained as follows:

[0106]

[0107] Among them, in formula (4-1), M Ni Represents the molar mass of nickel, and m represents the mass of the ternary material or ternary precursor in step 1'.

[0108] Step 5. Subtract the molar amount of manganese obtained in step 2 from the total molar amount of...

Embodiment 1

[0132] (1) Sample preparation

[0133] Accurately weigh 2.5g Ni 0.5 co 0.2 mn 0.3 (OH) 2 , add 60mL (1+1 hydrochloric acid), heat to dissolve, dilute to 1000mL volumetric flask, shake well for later use.

[0134] (2) Sample testing

[0135] (2.1) Accurately pipette 25mL of the dissolved and constant volume solution, add 10mL of ammonia-ammonium chloride buffer solution, 0.03g of ammonium viuridine as indicator, titrate to the end point with EDTA standard solution, the color changes from bright yellow to purple, Record the volume of EDTA consumed. According to the formula (1), the total molar amount n(Ni / Co / Mn) of nickel, cobalt and manganese is obtained.

[0136] (2.2) Accurately pipette 25mL of the dissolved sample solution, add 6mL of concentrated phosphoric acid, heat on an electric stove at 230°C until the liquid level is calm and a large amount of white smoke is emitted, take it off, cool for 10s, add 1g of ammonium nitrate, and use Wash the ear ball and blow away ...

Embodiment 2

[0142] Repeat the process of Example 1, the difference is: in (2.2), add 4mL concentrated phosphoric acid, the content of manganese obtained is 17.32%.

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Abstract

The invention discloses a method for detecting the content of nickel, cobalt and manganese in a ternary material or a ternary precursor. According to the method, the total molar quantity of the nickel, the cobalt and the manganese is obtained by a complexometric titration method, the molar quantity of the manganese is obtained by an oxidation-reduction titration method, the total molar quantity ofthe cobalt and the manganese is obtained by a potentiometric titration method, and then difference deduction is conducted to obtain the content of nickel, cobalt and manganese in a ternary material or a ternary precursor. According to the method, expensive instruments are not used, the test method is low in cost, operation of testing the content of the nickel by precipitating the manganese is avoided cleverly by the difference deduction method, and the test accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of element determination, and in particular relates to the determination of the content of nickel, cobalt and manganese, in particular, to a method for detecting the content of nickel, cobalt and manganese in ternary materials or ternary precursors. Background technique [0002] Nickel-cobalt-manganese ternary materials have the advantages of high specific capacity, wide discharge voltage range, stable electrochemical performance and good safety performance. Therefore, they have broad market prospects, and nickel-cobalt-manganese ternary materials and their precursors The accurate determination of the content of nickel, cobalt and manganese is the difficulty and key to the preparation of nickel-cobalt-manganese ternary materials or ternary material precursors. [0003] At present, instrumental analysis methods such as plasma emission spectroscopy (ICP-AES) or atomic absorption spectroscopy (AAS) are mostly u...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N31/16G01N27/42
CPCG01N21/78G01N27/42G01N31/16
Inventor 许敏彭甫英韩立娟李驰平江卫军苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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