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Method for determining sulfate radical in nickel hydroxide for batteries

A technology of nickel hydroxide and sulfate radical, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of high cost, long analysis period, and low measurement accuracy of sulfate radical content, and achieve low cost, short analysis period, The effect of high accuracy

Inactive Publication Date: 2012-02-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention solves the technical problems of low measurement accuracy of sulfate radical content in nickel hydroxide, long analysis period and high cost existing in the prior art

Method used

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  • Method for determining sulfate radical in nickel hydroxide for batteries
  • Method for determining sulfate radical in nickel hydroxide for batteries
  • Method for determining sulfate radical in nickel hydroxide for batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) SO 4 2- Preparation of standard curve:

[0056] Transfer SO 4 2- Standard solution 0mL, 1mL, 2mL, 3mL, 4mL were respectively placed in five 100mL volumetric flasks, 1mL of sodium salt mixed solution was added to each, diluted to 100mL with high-purity water, sample was injected according to the chromatographic determination conditions, and the conductance-retention time chromatogram was recorded. Create an area-concentration standard curve based on the chromatograms of the serial concentration standard solutions. Qualitative by retention time, quantitative by peak area.

[0057] Chromatographic determination conditions: guard column IonPacAG4A-SC (4 × 50mm), separation column IonPacAS4A-SC (4 × 250mm), chemical regeneration suppressor DIONEX AMMS3004-mm, conductivity detector DIONEX MODEL DS5, injection volume 20 microliters, into Sample pressure 8psi, eluent 1.8mmol / LNa 2 CO 3 +1.7mmol / LNaHCO 3 , eluent flow rate 1mL / min, regeneration solution 32mmol / LH 2 ...

Embodiment 2

[0068] Adopt the step identical with embodiment 1 to carry out experiment, difference is: in step (2), replace and add zinc spherical nickel hydroxide with cobalt spherical nickel hydroxide, as the test sample B of present embodiment; The consumption of mixed acid It was 5 mL; potassium hydroxide was added to adjust pH=9.5. The test results of the parallel experiment are shown in Table 3, and the test results of the recovery test are shown in Table 4.

[0069] table 3

[0070]

[0071] Table 4

[0072]

Embodiment 3

[0074] Adopt the step identical with embodiment 1 to carry out experiment, difference is: in step (2), replace and add zinc spherical nickel hydroxide with cadmium spherical nickel hydroxide, as the test sample C of present embodiment; The consumption of mixed acid to 6 mL; add potassium hydroxide to adjust pH=11. The test results of the parallel experiment are shown in Table 5, and the test results of the recovery test are shown in Table 6.

[0075] table 5

[0076]

[0077] Table 6

[0078]

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Abstract

The invention provides a method for determining sulfate radical in nickel hydroxide for batteries, comprising the following steps: 1) dissolving nickel hydroxide for batteries completely in mixed acid, wherein, the mixed acid comprises hydrochloric acid, nitric acid and hydrofluoric acid with the molar ratio of 1 to 0.6-1.4 to 1.5-2.5 measured as H+; 2) heating the system obtained by the step 1) until boiling, adding pH regulator to regulate the pH value of the system to 8-11, and depositing metal ions; and 3) filtering, and analyzing the filtrate by ion chromatography to obtain the content of sulfate radical. The method disclosed herein has the advantages of high accuracy of the detection of the content of sulfate radical, simple process, short analysis period, and low cost.

Description

technical field [0001] The invention relates to a method for determining the content of sulfate radicals in nickel hydroxide for batteries. Background technique [0002] Nickel hydroxide is a positive electrode active material for nickel-metal hydride (Ni / MH) batteries and nickel-cadmium (Ni / Cd) batteries. Using nickel sulfate as raw material and adopting wet process to prepare nickel hydroxide, it is easy to introduce sulfate radical impurities, and the content of sulfate radical has a great influence on the electrical performance of the battery. Therefore, the rapid and accurate determination of the sulfate radical content in nickel hydroxide can be The production and monitoring of spherical nickel hydroxide materials provide convenience. [0003] The determination methods of sulfate include gravimetric method, potentiometric titration method and so on. For example, GB / T20507-2006 discloses the use of barium sulfate gravimetric method to determine sulfate content, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 梁定涛陈梁刘芳张开兵
Owner BYD CO LTD