摘要:
Disclosed is an anode for a lithium battery comprising a body of carbon, such as graphitic carbon, having a layer of a Group IV element or Group IV element-containing substance disposed upon its electrolyte contacting surface. Further disclosed is an anode comprising a body of carbon having an SEI layer formed thereupon by interaction of a layer of Group IV element or Group IV element-containing substance with an electrolyte material during the initial charging of the battery.
摘要:
A multi-phase metal hydride alloy material which is capable of reversibly absorbing and desorbing hydrogen includes a first main phase or group of phases having an ABx type crystalline structure and a second phase which has a concentration of a modifier element therein which is greater than the concentration of the modifier element in the first phase or group of phases. The modifier element functions to promote the formation of the second phase and may comprise a light rare earth element such as yttrium. The first phase or group of phases may incorporate one or more Laves phases such as a C14, C15, and/or C36 phase. Further disclosed are metal hydride batteries including the alloys.
摘要:
A hydrogen storage alloy having the atomic formula AB4.75-5.25. Where A may comprise at least 85 atomic percent Nd and less than 15 atomic percent other rare earth elements and Mg and B may comprise Ni, Co, and at least one element selected from the group consisting of Mn and Al. The atomic percentages of Mn and Al may be governed by the following formulas where Mn and Al are in atomic percent: 1) Mn+1.5 Al≧6 atomic percent; and 2) Mn+Al≦12 atomic percent. The total percent of Mn and Al may provide the alloy with a 20° C. plateau pressure of between 4 and 25 psi, preferably between 6 and 20 psi. The hydrogen storage alloy allows a nickel metal hydride battery into which it is incorporated to maintain a voltage of at least 1.2 V at a depth of discharge of 90%.
摘要:
A method of making a catalyst. The method comprises the step of leaching a portion of the bulk of an alloy. The alloy may be a hydrogen storage alloy.
摘要:
A hydrogen storage battery with improved cycle life and a method for making the same. The battery has a negative electrode with an electrochemically active negative material and a negative electrode capacity and a positive electrode electrochemically coupled with the negative electrode, the positive electrode having a positive electrode capacity and an electrochemically active positive material with a precharge.Also described herein is a positive electrode material for a hydrogen storage battery and a method for making the same. The positive electrode material includes a preoxidized positive active material which is partially non-oxidized. The preoxidized positive material may be used to provide precharge to the positive electrode of a hydrogen storage battery to aid in cell balancing.
摘要:
Electrochemical and gas phase hydrogen storage alloy compositions that provide superior performance, especially at low temperature, and excellent cycle life characteristics. The alloys of this invention are AB5 type alloys that include a cycle life enhancement element and a low Co concentration. The preferred cycle life enhancement elements include Zr and Si. The cycle life enhancement elements increase the cycle life of the instant alloys by reducing the pulverization of alloy particles upon repeated cycles of charging-discharging or hydriding-dehydriding. The alloys are characterized by low hysteresis on cycling, where hysteresis is measured in terms of mass concentration difference, a parameter related to the activation energy associated with the incorporation of hydrogen into the alloy. The instant alloys are designed to have a low activation energy for hydrogen incorporation and as a result, provide low hysteresis and a more uniform concentration of absorbed hydrogen within the material. As a result, differential lattice expansion effects associated with the absorption of hydrogen are minimized and the tendency for particle pulverization on cycling is minimized. Alloys having a low Co concentration and long cycle life are thus provided for.
摘要:
A reversible hydrogen storage alloy for electrochemical and thermal hydrogen storage having excellent kinetics and improved performance at low temperatures and excellent cycle life. The compositions of the hydrogen storage alloy is modified to achieve excellent performance at low temperatures and excellent cycle life via non-stoichiometric hydrogen storage alloy compositions.
摘要:
A fuel cell. The anode of the fuel cell comprises a hydrogen oxidation catalyst comprising a finely divided metal alloy particulate. The metal alloy particulate has an average particle size of less than about 100 Angstroms.
摘要:
A fuel cell. The anode of the fuel cell comprises a hydrogen oxidation catalyst comprising a finely divided metal particulate. The metal particulate may be a nickel and/or nickel alloy particulate having a particle size less than about 100 Angstroms.
摘要:
A BCC phase hydrogen storage alloy capable of storing approximately 4.0 wt. % hydrogen and delivering reversibly up to 3.0 wt. % hydrogen at temperatures up to 110° C. The hydrogen storage alloys also possess excellent kinetics whereby up to 80% of the hydrogen storage capacity of the hydrogen storage alloy may be reached in 30 seconds and 80% of the total hydrogen storage capacity may be desorbed from the hydrogen storage alloy in 90 seconds. The hydrogen storage alloys also have excellent stability which provides for long cycle life.