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Briefs: Energy
High-energy-density primary (nonrechargeable) electrochemical cells capable of relatively high discharge currents at temperatures as low as –40 °C have been developed through...
Briefs: Electronics & Computers
Circuit for Full Charging of Series Lithium-Ion Cells
An advanced charger has been proposed for a battery that comprises several lithium-ion cells in series. The proposal is directed toward charging the cells in as nearly an optimum manner as possible despite unit-to-unit differences among the nominally identical cells.
Briefs: Materials
Lithium Dinitramide as an Additive in Lithium Power Cells
Lithium dinitramide, LiN(NO2)2 has shown promise as an additive to nonaqueous electrolytes in rechargeable and non-rechargeable lithium-ion-based electrochemical power cells. Such non-aqueous electrolytes consist of lithium salts dissolved in mixtures of organic ethers, esters, carbonates,...
Briefs: Physical Sciences
Anion-IntercalatingCathodes for High-Energy-Density Cells
A report discusses physicochemical issues affecting a fluoride-intercalating cathode that operates in conjunction with a lithium ion-intercalating anode in a rechargeable electrochemical cell described in a cited prior report. The instant report also discusses corresponding innovations made...
Briefs: Electronics & Computers
The protocol for charging a lithiumion battery would be modified, according to a proposal, to compensate for the internal voltage drop (charging current × internal resistance of the...
Briefs: Materials
Two perfluoroalkanesulfonic acids and perfluoroalkanesulfonimides have shown promise as anodecoating materials for improving the performances of direct methanol fuel cells (DMFCs)....
Briefs: Electronics & Computers
Although battery-powered computer based instruments are commonplace, they typically lack powerful processors capable of running sophisticated Windows 2000/XP-level...
Briefs: Energy
Virtually all businesses and industries are vulnerable to electric power disturbances such as outages, sags, swells, and harmonics. These problems are less of an...
Briefs: Nanotechnology
Treated Carbon Nanofibers for Storing Energy in Aqueous KOH
A surface treatment has been found to enhance the performances of carbon nanofibers as electrode materials for electrochemical capacitors in which aqueous solutions of potassium hydroxide are used as the electrolytes. In the treatment, sulfonic acid groups are attached to edge plane sites...
Briefs: Materials
Mats of free-standing manganese oxide (MnxOy ) nanowires have been fabricated as experimental electrode materials for rechargeable electro-chemical power cells and capacitors....
Briefs: Photonics/Optics
Lightweight, Flexible, Thin, Integrated Solar-Power Packs
Lightweight, flexible, thin, one-piece, solar-power packs are undergoing development. Each power pack of this type is a complete, modular, integrated power-supply system comprising three power subsystems that, in conventional practice, have been constructed as separate units and connected to...
Briefs: Manned Systems
In the summer of 2001, the Helios prototype solar-powered uninhabited aerial vehicle (UAV) [a lightweight, remotely piloted airplane] was deployed to the Pacific Missile Range Facility...
Briefs: Electronics & Computers
Cube-shaped thermoelectric devices energized by a particles from radioactive decay of 244Cm have been proposed as long-lived sources of power. These power cubes are intended especially for...
Briefs: Electronics & Computers
A modular, integrated, completely solid-state system designed to harvest and store solar energy is under development. Called the "power tile," the hybrid device consists of a photovoltaic...
Briefs: Lighting
A unique safety flasher powered by photovoltaic cells and ultracapacitors has been developed. Safety flashers are used wherever there are needs to mark actually or potentially hazardous...
Briefs: Materials
Curved mirrors of a proposed type would comprise lightweight sheets or films containing integral, biologically inspired actuators for controlling their surface figures. These mirrors could...
Briefs: Materials
Mixed Conducting Electrodes for Better AMTEC Cells
Electrode materials that exhibit mixed conductivity (that is, both electronic and ionic conductivity) have been investigated in a continuing effort to improve the performance of the alkali metal thermal-to-electric converter (AMTEC). These electrode materials are intended primarily for use on the...
Briefs: Energy
The term "common/dependent pressure vessel" (C/DPV) denotes a proposed alternative configuration for a nickel-hydrogen battery. The C/DPV configuration is so named because it...
Briefs: Energy
Polymeric electrolytes for rechargeable lithium-based electrochemical cells and batteries would be made by blending and complexing cyanoresins with lithium salts, according to a proposal....
Briefs: Manned Systems
In support of NASA’s Environmental Research Aircraft and Sensor Technology (ERAST) program, flight tests of the Pathfinder solar-electric-powered, remotely...
Briefs: Materials
Crystalline phases of compounds of general composition (Cuw, CuxFey, or Tiz)Mo6Se8 [where w<4, x<2, y<1, and z<1] have been investigated for potential utility as thermoelectric...
Briefs: Energy
Alkyl pyrocarbonates have been found to be useful as electrolyte additives for improving the low-temperature performances of rechargeable lithium-ion electrochemical cells. The...
Briefs: Materials
Partially fluorinated alkyl carbonate liquid compounds have been found to be excellent electrolyte cosolvents for rechargeable lithium-ion electrochemical cells. The benefits afforded...
Briefs: Energy
A relatively simple test circuit immediately and automatically provides indications of (1) the continuity (or the lack thereof) of the wires of a two-wire cable, plus (2) a short circuit (if any)...
Briefs: Energy
Improved Charge-Termination Technique for Lithium-Ion Cells
An improved charge-termination technique has been developed to obtain a more accurate balance between charge and discharge of rechargeable lithium-ion-based electrochemical cells and batteries. The technique has been demonstrated experimentally and is now in use in a laboratory battery...
Briefs: Energy
Storage batteries based on intercalation of lithium and bromine in graphite have been proposed. Like other storage batteries, these could be recharged electrically. Optionally, these...
Briefs: Materials
Oxygen Batteries Based on a Solid Polymer Electrolyte
Scientists have developed a derivative of the lithium-ion cell that could prove useful in spaceflight and commercial applications in which it is planned to use oxygen batteries based on solid polymer electrolytes. This derivative cell, which contains a solid polymer electrolyte and an oxygen gas...
Briefs: Energy
Improved zinc anodes for silver/zinc and nickel/zinc rechargeable electrochemical cells have been invented. This invention will increase the usefulness and decrease cycle-life costs of Ag/Zn...
Briefs: Manufacturing & Prototyping
A number of matrix resins that contain thermosetting plasticizers have been developed for use in the resin-transfer molding (RTM) of composite-material (fiber/matrix) parts. These...
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