Synthesis and characterization of nickel hydroxide powders for battery application

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The primary objective of this research was to investigate the synthesis and characterization of Ni(OH){sub 2} powders by homogeneous precipitation. Previous research of the same method showed conflicting results and complete characterization of the particle morphology was not carried out. This study has produced precipitates having a composition of 2Ni(OH){sub 2}{center_dot}Ni(HCO{sub 3}){sub 1.85}(NO{sub 3}){sub 0.15}. The XRD patterns showed peaks commonly observed for {alpha}-Ni(OH){sub 2}. The precipitates produced from low and high cation concentration solutions showed that the mean particle size and specific surface area increased with aging time. The high specific surface area measured suggested that the particle growth ... continued below

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10 p.

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Widjaja, A. October 8, 1997.

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This thesis or dissertation is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this document can be viewed below.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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Description

The primary objective of this research was to investigate the synthesis and characterization of Ni(OH){sub 2} powders by homogeneous precipitation. Previous research of the same method showed conflicting results and complete characterization of the particle morphology was not carried out. This study has produced precipitates having a composition of 2Ni(OH){sub 2}{center_dot}Ni(HCO{sub 3}){sub 1.85}(NO{sub 3}){sub 0.15}. The XRD patterns showed peaks commonly observed for {alpha}-Ni(OH){sub 2}. The precipitates produced from low and high cation concentration solutions showed that the mean particle size and specific surface area increased with aging time. The high specific surface area measured suggested that the particle growth occurred through the aggregation of nanosized crystallites. The TEM micrographs confirmed that the particles were actually aggregates of thin films or sheets that were crumpled and intertwined together. This work also investigated the effect of dispersant on the particle morphology. The addition of dispersants did not alter the density of the particles implying that the dispersants were not incorporated into the solid phase. A general decrease in mean particle size at each aging time was observed resulting in an increase in specific surface area. The use of dispersants provided steric hindrance for the particles in the solution to aggregate, thus smaller particles were observed. Cyclic voltammetric tests were carried out to see if the high surface area Ni(OH){sub 2} produced in this work had superior performance characteristics compared to the commercial powders currently available. Indeed, the study showed that the homogeneously precipitated Ni(OH){sub 2} had higher coulombic efficiency and degree of reversibility than the commercial powders. The efficiency values of all the homogeneously precipitated powders were approximately 90%. The same efficiency values observed were probably due to the same specific surface areas of the powders after aging in KOH solution.

Physical Description

10 p.

Notes

OSTI as DE99002528

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  • Other Information: DN: Thesis submitted to Iowa State Univ., Ames, IA (US); TH: Thesis (M.S.)

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  • Other: DE99002528
  • Report No.: IS-T--1826
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 348926
  • Archival Resource Key: ark:/67531/metadc681631

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 8, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 6, 2015, 9 p.m.

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Widjaja, A. Synthesis and characterization of nickel hydroxide powders for battery application, thesis or dissertation, October 8, 1997; Iowa. (digital.library.unt.edu/ark:/67531/metadc681631/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.