Alloys or metallic compositions – Magnesium base
Reexamination Certificate
1999-11-06
2001-02-27
King, Roy V. (Department: 1742)
Alloys or metallic compositions
Magnesium base
C420S407000, C420S900000
Reexamination Certificate
active
06193929
ABSTRACT:
FIELD OF THE INVENTION
The instant invention relates generally to revolutionary new hydrogen storage alloys that are able, for the first time to realistically use the most ubiquitous, ultimate source of fuel for the next millennium and beyond, hydrogen. More particularly, there is described the use of such hydrogen storage alloys that make it possible to form a system that combines all the necessary attributes to enable the safe and efficient storage, transportation and delivery of hydrogen to, by way of example and not limitation, power internal combustion engine or fuel cell vehicles.
BACKGROUND OF THE INVENTION
This patent, for the first time, describes hydrogen storage alloys that have surmounted the chemical, physical, electronic and catalytic barriers that have heretofore been considered insoluble. The instant invention relates generally and specifically to solving the, up to now, unanswered problem of having sufficient hydrogen storage capacity with fast enough kinetics to permit the safe and efficient storage of hydrogen to provide fuel for a hydrogen based economy, such as powering internal combustion engine and fuel cell vehicles. The instant invention also solves the twin basic barriers which have held back the use of the “ultimate fuel,” namely hydrogen storage capacity and a hydrogen infrastructure. The infrastructure problem can be solved once there is an acceptable storage material, since hydrogen can be shipped safely by boat, barge, train, trucks, etc. when in solid form, creating an instant infrastructure. The complete infrastructure system from “source to wheel” is the subject of copending U.S. application Ser. No. 09/444,810, filed Nov. 22, 1999. The use of the alloys of the instant invention also, because of the ultra-high capacity thereof, solve the problem of societal dependence on gasoline by providing an automobile with ranges in excess of 300 miles.
Here we specifically describe the basic means in which multi-elemental Mg based hydrogen storage materials are designed into hydrogen storage alloys by considering them as a system. These multi-elemental alloys can also be made in a non-equilibrium manner so that not only compositional disorder is produced, but also the desired local chemical order is formed. Specifically, one portion of the invention relates to modified Mg based hydrogen storage alloys. The inventors have for the first time produced Mg based alloys having both hydrogen storage capacities higher than about 6 wt. % and extraordinary kinetics. This revolutionary breakthrough has been made possible by considering the materials as a system and thereby utilizing chemical modifiers and the principles of disorder and local order, pioneered by Stanford R. Ovshinsky (one of the instant inventors), in such a way as to provide the necessary catalytic local order environments, such as surfaces and at the same time designing bulk characteristics for storage and high rate charge/discharge cycling. In otherwords, these principles allow for tailoring of the material by controlling the particle and grain size, topology, surface states, catalytic activity, microstructure, and total interactive environments for storage capacity.
As the world's population expands and its economy increase; the atmospheric concentrations of carbon dioxide are warming the earth causing climate change. However, the global energy system is moving steadily away from the carbon-rich fuels whose combustion produces the harmful gas. Experts say atmospheric levels of carbon dioxide may be double that of the pre-industrial era by the end of the next century, but they also say the levels would be much higher except for a trend toward lower-carbon fuels that has been going on for more than 100 years. Furthermore, fossil fuels cause pollution and are a causative factor in the strategic military struggles between nations.
For nearly a century and a half, fuels with high amounts of carbon have progressively been replaced by those containing less. First wood, which is high in carbon, was eclipsed in the late 19
th
century by coal, which contains less carbon. Then oil, with a lower carbon content still, dethroned “King Coal” in the 1960's. Now analysts say that natural gas, lighter still in carbon, may be entering its heyday, and that the day of hydrogen—providing a fuel with no carbon at all—may at last be about to dawn. As a result, experts estimate the world's economy today burns less than two-thirds as much carbon per unit of energy produced as it did in 1860.
In the United States, it is estimated, that the trend toward lower-carbon fuels combined with greater energy efficiency has, since 1950, reduced by about half the amount of carbon spewed out for each unit of economic production. Thus, the decarbonization of the energy system is the single most important fact to emerge from the last 20 years of analysis of the system. It had been predicted that this evolution will produce a carbon-free energy system by the end of the 21
st
century. The present invention shortens that period to a matter of years. In the near term, hydrogen will be used in fuel cells for cars, trucks and industrial plants, just as it already provides power for orbiting spacecraft. But ultimately, hydrogen will also provide a general carbon-free fuel to cover all fuel needs.
As noted in recent newspaper articles, large industries, especially in America, have long been suspicious of claims that the globe is warming and have vociferously negated the science of climate change. Electric utilities have even tried to stoke fears among ordinary folk that international treaties on climate change would cut economic growth and cost jobs. Therefore, it is very encouraging that some of the world's biggest companies, such as Royal Dutch/Shell and BP Amoco, two large European oil firms, now state plainly what was once considered heresy: global warming is real and merits immediate action. A number of American utilities vow to find ways to reduce the harm done to the atmosphere by their power plants. DuPont, the world's biggest chemicals firm, even declared that it would voluntarily reduce its emissions of greenhouse gases to 35% of their level in 1990 within a decade. The automotive industry, which is a substantial contributor to emissions of greenhouse gases and other pollutants (despite its vehicular specific reductions in emissions), has now realized that change is necessary as evidenced by their electric and hybrid vehicles. In this field, the assignee of the subject invention, has developed the Ovonic nickel metal hydride battery to make electric and hybrid vehicles possible.
FIG. 1
, taken from reliable industrial sources, is a graph demonstrating society's move toward a carbon-free environment as a function of time starting with the use of wood in the early 1800s and ending in about 2010 with the beginning of a “hydrogen” economy. In the 1800s, fuel was primarily wood in which the ratio of hydrogen to carbon was about 0.1. As society switched to the use of coal and oil, the ratio of hydrogen to carbon increased first to 1.3 and then to 2. Currently, society is inching closer to the use of methane in which the hydrogen to carbon ratio is further increased to 4. However, the ultimate goal for society is to employ a carbon-free fuel, i.e., the most ubiquitous of elements, pure hydrogen. The obstacle has been the lack of solid state storage capacity and infrastructure. The inventors of the subject patent application have made this possible by inventing a 7% storage material (further improvement very likely via additional research efforts) with exceptional absorption/desorption kinetics, that allow for the first time, a safe, high capacity means of storing, transporting and delivering pure hydrogen.
Hydrogen is the “ultimate fuel.” In fact, it is considered by most to be “THE” fuel for the next millennium, and, it is inexhaustible. Hydrogen is the most plentiful element in the universe (over 95%) and was the first element created by the “Big-Bang.” Hydrogen can provide an inexhaustible, clean source o
Ovshinsky Stanford R.
Young Rosa T.
Combs Morillo Janelle
Energy Conversion Devices Inc.
King Roy V.
Schlazer Philip H.
Schumaker David W.
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