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Analysing method for surface oxidation degree of bivalent Co and positive material utilization ratio

A technology of cobalt compounds and surface oxidation, which is applied in the direction of material analysis, analysis materials, and instruments using wave/particle radiation, can solve the problems of inability to accurately reflect the degree of oxidation of divalent cobalt compounds, high cost, and long experimental period. Fast, efficient method of production and procurement, easy to operate results

Inactive Publication Date: 2007-12-19
BYD CO LTD
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Problems solved by technology

Although this method can accurately judge the electrochemical performance of divalent cobalt compounds, it has the disadvantages of long experimental period and high cost.
Moreover, since the battery capacity is related to many factors, such a criterion cannot accurately reflect the degree of oxidation of divalent cobalt compounds.

Method used

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  • Analysing method for surface oxidation degree of bivalent Co and positive material utilization ratio
  • Analysing method for surface oxidation degree of bivalent Co and positive material utilization ratio
  • Analysing method for surface oxidation degree of bivalent Co and positive material utilization ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0025] Take the divalent cobalt compound samples S1, S2, S3, S4, S5, S6 and S7 described in Table 1 to carry out XPS test respectively, wherein the test conditions of XPS are as follows:

[0026] X-ray photoelectron spectrometer: the model PHI5800 X-ray photoelectron spectrometer produced by American PHI Company; the excitation source is monochromatic Al X-ray, the analysis area is a circle with a diameter of 800 microns, and the pass energy of the analyzer is 11.75 Volts with a step size of 0.05 eV. After obtaining the Co2p photoelectron peak, pollute C 1s = 284.8 electron volts as the standard to calibrate the charging effect, and then use the truncate method to deduct the background, and the obtained XPS spectra are shown in Figures 1-7. Then according to Fig. 1-7 and use the surface oxidation degree relational formula x%=(13-20y) / 13(y+1)*100% of divalent cobalt compound to calculate the surface oxidation degree of divalent cobalt compound, calculation result is as follows...

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Abstract

A method for analyzing oxidation degree of surface on bivalent cobalt compound includes judging oxidation degree of surface on bivalent cobalt compound according to relative intensity of shake-up satellite peak in cobalt compound XPS spectrogram, setting said shake-up satellite peak relative intensity to be ratio of shake-up satellite peak intensity to relevant master peak intensity of shake-up satellite peak so that oxidation degree of surface on bivalent cobalt compound is to be lower when relative intensity is to be higher.

Description

technical field [0001] The invention relates to an analysis method for the surface oxidation degree of a divalent cobalt compound and an analysis method for the utilization rate of positive electrode materials using the divalent cobalt compound as a conductive agent. Background technique [0002] In order to increase the utilization rate of Ni-Cd, Ni-MH and Ni-Zn battery cathode materials, CoO or Co(OH) is generally added to the cathode materials. 2 The divalent cobalt compound is used as a conductive agent, and the divalent cobalt compound added to the positive electrode material is first dissolved in the alkaline electrolyte and mixed with OH - reaction to generate water-soluble HCoO 2 - Complex ions diffuse in the electrolyte. In the battery formation stage, HCoO 2 - The complex ions are oxidized to Co(OOH) with good conductivity, forming a conductive network between the positive electrode material particles, thereby improving the utilization rate of the positive ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223
Inventor 胡刚董俊卿
Owner BYD CO LTD
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