Tag Archives: Voedingen

Flow-Battery Breakthrough Slashes Costs

via Elektor.com: News

Flow batteries are based on the electro-chemical reaction produced by the interaction between two fluid electrolytes. The two electrolyte solutions are generally stored in separate external tanks and pumped through the battery cell. Energy storage capacity is largely governed by the size of the tank. This would make them ideal for smoothing out the energy from intermittent power sources such as wind, wave and solar. A quick way to recharge the battery is to just to replace the...

New Battery Technology Charges 1000 Times Faster

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A team at the University of Illinois has unveiled a battery design which offers 10 times the energy density and 1000 times faster recharge time compared to current cell technology according to a paper in the Journal Nature Communications.   The battery uses a LiMnO2 cathode and NiSn anode but the real innovation is in the novel electrode design. The electrodes are fabricated using a lattice of tiny polystyrene spheres which are coated with metal. The spheres are then dissolved to leave a...

Rechargeable Wooden Battery

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Inspired by trees scientists at the University of Maryland have developed a nanobattery that uses tin-coated wood fibers to store liquid electrolytes. Replacing the lithium found in many rechargeable batteries by sodium makes the battery environmentally benign. Sodium doesn’t store energy as efficiently as lithium, so you won’t see this battery in your cell phone - instead, its low cost and common materials would make it ideal to store huge amounts of energy at once, such as solar energy at a...

Ideal Diode Bridge Controller Minimizes Rectifier Heat & Voltage Loss

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Linear Technology Corporation introduces the LT4320, an ideal diode bridge controller for 9V to 72V systems that replaces each of the four diodes in a full-wave bridge rectifier with a low loss N-channel MOSFET to significantly reduce the power dissipation and increase available voltage. Power supply size is reduced as the enhanced power efficiency eliminates bulky heat sinks. Low voltage applications benefit from the extra margin afforded by saving the two diode drops inherent in diode...

Lots of Power in Very Small Volume

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Vicor Corporation announced the expansion of its ultra-high density Picor Cool-Power PI31xx series of isolated, ZVS-based DC-DC converters optimized for 24 V industrial, 28 V aerospace and defense, and demanding wide temperature applications. The new converters retain the product series’ signature 0.87" x 0.65" x 0.265" (2.2 x 1.65 x 0.67 cm) surface-mount package profile to provide up to 334 W/in 3 power density and...

Cable Drop Compensation without Sense Wires

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Linear Technology announces the LT6110 cable drop compensator, a new device that improves voltage regulation at remote loads without the need for Kelvin sense wires. The new device has been architected for use with most types of voltage regulators and can provide several volts of load regulation compensation. It will compensate for the voltage drop due to resistance in a wire, circuit board trace or cable and can improve regulation at the load by a factor of 10. It operates with supply...

Health Care For Lead-Acid Batteries

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Texas Instruments has launched the first lead-acid battery management IC featuring a proprietary “Impedance Track” capacity measurement technology for lead-acid batteries. The bq34z110 “gas gauge” IC claims to be the industry’s only scalable power management device to support multi-cell lead-acid battery packs with voltages of 4, 12, 24, 48 V or higher. The highly accurate, user-friendly gas gauge supports batteries used in mobile and stationary applications such as medical instruments,...

Direct Current Resonance Allows Wireless Power Transmission

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Direct current resonance is a new technology that converts direct current electric energy into electromagnetic field energy and uses a newly discovered physical phenomenon called an electromagnetic resonance field to transmit power. The technology can enhance energy conversion efficiency because a resonance field is formed directly from the direct current power source. It can also reduce the number of times power is converted in the power transmission system and achieve greater simplicity and...

Li-S Batteries Progress Well

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Due to its high theoretical power density, lithium-sulfur technology is regarded as a promising candidate for electric vehicle batteries. As an active cathode material, sulfur has a theoretical specific capacity of 1,672 mAh/g and an average discharge potential of 2.2 V. The energy density of Li-S batteries could be as high as 600 Wh/kg, compared to a maximum of 200 Wh/kg for lithium-ion batteries with intercalation cathodes. Additional benefits of sulfur include higher safety and lower cost...

Redox Flow Battery Delivers 25 kW

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When electricity is generated from intermittent sources of energy, energy storage devices are necessary to buffer electrical power fluctuations. One option is redox flow batteries, which store electrical energy in liquid electrolytes that flow through the battery into holding tanks. These electrolytes can later be circulated back through the battery to generate electricity.   Redox flow batteries offer several advantages: they are cost-effective, robust, durable, and can be customized....

Nano Rectannas Grab More Energy From Sunlight

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Even the best silicon panels collect only about 20% of available solar radiation and they require additional devices to convert the energy to usable electricity. A new technique using nano-sized antenna arrays could theoretically harvest more than 70% of the energy in sunlight, but the technology required to build and test them has been lacking. These nano-antennas, called "rectennas" because they can both absorb solar radiation and rectify the radiation waveform to generate direct...

Power Controller Integrates Analog PWM and Digital MCU

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Microchip announces the MCP19111, the world’s first digitally enhanced power analog controller that integrates an analog-based PWM controller with a fully functional Flash-based microcontroller. This integration offers the flexibility of a digital solution, with the speed, performance and resolution of an analogue-based controller.  The new devices support operation up to 32 V, and have integrated MOSFET drivers configured for synchronous, step-down applications.   To accompany...

Thin-Film Solar Cells Stick Anywhere

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Researchers at Stanford University (USA) have developed novel peel-and-stick thin-film solar cells. Unlike standard thin-film solar cells, they do not require direct fabrication on the final substrate. This avoids the difficulties associated with putting solar cells on unconventional materials, vastly expanding the potential applications of solar power. Although thin-film technology promised to boost the flexibility of solar power, thin-film cells are conventionally fixed on rigid silicon...

Fabric Weaves Spherical Solar Cells

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In cooperation with the Industrial Technology Center of Fukui Prefecture (Japan), Sphelar Power Corporation has prototyped an energy-harvesting fabric with interwoven spherical solar cells. The novel solar cells, dubbed ‘Sphelar cells’, can  collect sunlight more effectively and more uniformly than conventional flat solar cells because they are less sensitive to the angle of incidence of the light.   Each spherical solar cell consists of a multi-layer bead with a pair of electrodes...

All-Paper Li-Ion Battery

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Researchers at the Laboratory of Pulp and Paper Science and Graphic Arts (LGP2) in Grenoble, France, in collaboration with the Polytechnic University of Torino, have developed a new paper-based Li-ion battery with paper electrodes instead of the usual polyester electrodes. The toxic solvent has also been eliminated, and the fluorinated binder has been replaced by cellulose fibres and microfibrils.   Using a simple filtration procedure with an aqueous medium, the fibres are destructured...