摘要:
A novel method of preparing a highly homogenous spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound having a predetermined mean particle size and particle size distribution for 4 V secondary lithium and lithium ion cells is provided. The method comprises mixing at least one manganese compound having a predetermined particle size distribution with at least one lithium compound wherein the manganese compound has a mean particle size of between about 1 and 15 microns and the mean particle size of the lithium compound is less than that of the manganese compound. The mixture is then fired in one or more firing steps within specific temperature ranges to form the Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound. Preferably, at least one firing step is at a temperature of between about 700.degree. C. and 900.degree. C. The Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacity, cycleability, and charge-discharge rate capability.
摘要:
A novel method of preparing a highly homogenous spinel Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound having a predetermined mean particle size and particle size distribution for 4 V secondary lithium and lithium ion cells is provided. The method comprises mixing at least one manganese compound having a predetermined particle size distribution with at least one lithium compound wherein the manganese compound has a mean particle size of between about 1 and 15 microns and the mean particle size of the lithium compound is less than that of the manganese compound. The mixture is then fired in one or more firing steps within specific temperature ranges to form the Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compound. Preferably, at least one firing step is at a temperature of between about 700.degree. C. and 900.degree. C. The Li.sub.1+X Mn.sub.2-X O.sub.4+Y intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacity, cycleability, and charge-discharge rate capability.
摘要:
A method of preparing a highly homogenous spinel Li1+XMn2−XO4+Y intercalation compound having a predetermined mean particle size and particle size distribution for 4 V secondary lithium and lithium ion cells is provided. The method comprises mixing at least one manganese compound having a predetermined particle size distribution with at least one lithium compound wherein the manganese compound has a mean particle size of between about 1 and 15 microns and the mean particle size of the lithium compound is less than that of the manganese compound The mixture is then fired in one or more firing steps within specific temperature ranges to form the Li1+XMn2−XO4+Y intercalation compound. Preferably, at least one firing step is at a temperature of between about 700° C. and 900° C. The Li1+XMn2−XO4+Y intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacity, cycleability, and charge-discharge rate capability.
摘要:
Provided herein are systems, methods, and software for facilitating message sessions. In one implementation, a notification is received relating to a message submitted for delivery on behalf of a sender to a recipient. The message includes several components. At least one delivery policy is identified based on the content identified in at least one of the components. Delivery of the message is initiated according to the delivery policy.
摘要:
A plurality of images, including a first image and a second image having a higher resolution than the first image, are aligned by generating an oversampled cross correlation image that corresponds to relative displacements of the first and second images, and, based on the oversampled cross correlation image, determining an offset value that corresponds to a misalignment of the first and second images. The first and second images are aligned to a precision greater than the resolution of the first image, based on the determined offset value. Enhanced results are achieved by performing another iteration of generating an oversampled cross correlation image and determining an offset value for the first and second images. Generating the oversampled cross correlation image may involve generating a cross correlation image that corresponds to relative displacements of the first and second images, and oversampling the cross correlation image to generate the oversampled cross correlation image.
摘要:
The invention is a versatile school bus traffic control system. When power is first applied, or the RESET pushbutton is pushed, it is set to its quiescent state. Pushing the MODE ADVANCE pushbutton switch will advance to the next state: flashing alternating yellow traffic control lights. The next push of MODE ADVANCE will advance the system to: flash traffic control lights, one side red and the other side yellow, next, the complementing red and yellow. This is repeated for approximately three seconds, next, automatically advancing to only alternating red traffic control lights flash, until MODE ADVANCE is again pushed. The invention then returns to quiescence. Optionally, the invention will reset, and or not respond to MODE ADVANCE if the school bus is in motion.
摘要:
The invention is an improvement in a disc and a handle for the receiver section of a fire fighting nozzle. Together, this disc and handle facilitate the opening and closing of a fire nozzle assembly, for permitting and preventing, respectively, the discharge of fire extinguishing fluids from that nozzle. The improvement of the present invention results from the use of a one-piece disc with generally resilient arms, and from the use of a plastic handle with a generally oblong shaped slot.
摘要:
A slurry coating composition is described, which is very useful for enriching the surface region of a metal-based substrate with aluminum. The composition includes colloidal silica and particles of an aluminum-based powder, and is substantially free of hexavalent chromium. The slurry may include colloidal silica and an alloy of aluminum and silicon. Alternatively, the slurry includes colloidal silica, aluminum or aluminum-silicon, and an organic stabilizer such as glycerol. The slurry exhibits good thermal and chemical stability for extended periods of time, making it very useful for industrial applications. Related methods and articles are also described.
摘要:
The invention is a portable, non-pressurized oxygen generation device. A first chamber holds an oxygen liberating chemical, and a catalyst from a second chamber begins the oxygen liberating reaction when the two chemicals mix. The chemicals are pre-measured, and oxygen generation can begin within seconds of activation.
摘要:
An oxygen sensor is provided with a virtual point contact electrode to improve performance, extend operational life and to minimize thermal shock breakage; it is also provided with reduced annular space between the protective sheath and zirconia electrolyte, and minimized communicating openings to the furnace atmosphere, in order to reduce burnoff air flow during probe conditioning.