Atomic structure and valency of nickel in some of its oxycompounds. Technical report

Technical Report · Tue Jun 28 04:00:00 EDT 1994

OSTI ID:7054315

Mansour, A N; Melendres, C A; Pankuch, M; Brizzolare, R A

The structure of the higher oxide forms of nickel (where Ni has a valency greater than +2) is of great interest from the standpoint, of developing advanced nickel batteries for consumer applications and for electric vehicle propulsion. In spite of the considerable research work that has been published, there is still much uncertainty and confusion as to the stoichiometry and structure of the various oxides (hydroxides) that are formed during the charging (and discharging) of the nickel electrode. The difficulty stems in part from the highly disordered or amorphous nature of the phases formed which makes structural determination by X-ray diffraction difficult. X-ray absorption spectroscopy (XAS) consisting of the X-ray absorption near edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS) is an excellent technique for the characterization of such materials which have no long range order. Preliminary to using the technique for in-situ structural determinations in an electrochemical cell, the authors have used XAS to study a number of standard samples for subsequent use as reference. They report initial XANES and EXAFS results that give the valency and structure of nickel in some compounds of interest in battery work.

• Research Organization: Naval Surface Warfare Center, Silver Spring, MD (United States)
• OSTI ID: 7054315
• Report Number(s): AD-A-281109/9/XAB; TR--2-ONR; CNN: N00014-93-WX-24290
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
CHALCOGENIDES
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDES
OXYGEN COMPOUNDS
STOICHIOMETRY
TRANSITION ELEMENT COMPOUNDS
VALENCE