摘要:
Nickel hydroxide material comprising particles with a microstructure including crystallites of less than 103 Å as measured in the 101 direction by x-ray diffraction.A method of making positive electrode material for use in an alkaline rechargeable electrochemical cell comprising forming a metal ion solution and increasing the pH to precipitate positive electrode material with a crystallite structure of 120 Å or less in the 101 direction.
摘要:
High capacity, long cycle life positive electrode modified nickel hydroxide material for use in an alkaline rechargeable electrochemical cell at least one modifier and has modified activation energy, chemical potential and electrical conductivity. Particle size, particle size distribution, electrical conductivity have been controlled by introducing modifier elements throughout the bulk of the active material and by controlling process parameters.
摘要:
High capacity, long cycle life positive electrode modified nickel hydroxide material for use in an alkaline rechargeable electrochemical cell at least one modifier and has modified activation energy, chemical potential and electrical conductivity. Particle size, particle size distribution, electrical conductivity have been controlled by introducing modifier elements throughout the bulk of the active material and by controlling process parameters.
摘要:
A method for making a composite positive electrode material for use in electrochemical cells. The composite material includes a particle of positive electrode material and a conductive material at least partially embedded within the interior of the particle of positive electrode material.
摘要:
A composite positive electrode material for use in electrochemical cells. The composite material may comprise a particle of positive electrode material, and a conductive material at least partially embedded within the particle of positive electrode material. The material may comprise a particle of positive electrode material, and a nucleating particle at least partially embedded therein.
摘要:
A method for making a composite positive electrode material for use in electrochemical cells. The composite material comprises a particle of positive electrode material and a nucleating particle at least partially embedded within the interior of the particle of positive electrode material.
摘要:
A composite positive electrode material for use in electrochemical cells. The composite material includes a particle of positive electrode material and a nucleating particle at least partially embedded within the interior of the particle of positive electrode material.
摘要:
Electrochemical and thermal hydrogen storage alloy compositions that provide superior performance, including an electrochemical hydrogen storage alloy that provides superior low temperature discharge characteristics. The alloy compositions include microstructures in the interface region that are highly porous and that include catalytic metallic particles. The microstructures include a large volume fraction of voids having spherical or channel-like shapes and are sufficiently open structurally to facilitate greater mobility of reactive species within the microstructure and in the vicinity of catalytic metallic particles. Greater accessibility to reactive sites accordingly results. The greater mobility of reactive species and/or the greater density of catalytic particles lead to faster kinetics and improved performance (e.g. higher power), especially at low operating temperatures. The microstructures may be formed through inclusion of a microstructure tuning element in the alloy composition, through control of processing conditions and/or through inclusion of etching steps in the post-formation processing of hydrogen storage alloys.
摘要:
An anti-pyrophoric hydrogen storage material having an engineered surface oxide to enhance initial activation and a method for making the same. The method for making. the hydrogen storage material includes the steps of providing a hydrogen storage powder and oxidizing the powder with a controlled oxidation reaction. In a preferred aspect hereof, the method includes providing a bulk hydrogen storage alloy; hydriding the alloy to form a comminuted material; and oxidizing the surface of the comminuted material with a controlled oxidation reaction. In another preferred aspect hereof, a passivating material is added to the comminuted material prior to the step for oxidizing to enhance initial activation. In still another preferred aspect hereof, at least one sacrificial modifier is provided in the particalized material to enhance initial activation.
摘要:
Disordered multicomponent hydrogen storage material characterized by extraordinarily high storage capacity due to a high density of useable hydrogen storage sites (greater than 10.sup.23 defect sites/cc) and/or an extremely small crystallite size. The hydrogen storage material can be employed for electrochemical, fuel cell and gas phase applications. The material may be selected from either of the modified LaNi.sub.5 or modified TiNi families formulated to have a crystallite size of less than 200 Angstroms and most preferably less than 100 Angstroms.