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Microneedles Extract Fluid for Wearable Sensors

  • Magazine Article
  • TBMG-34916
Published 2019-08-01 by Tech Briefs Media Group in United States

Interstitial fluid is clear, colorless, and similar to blood plasma. Continual sampling of important biomarkers in interstitial fluid could help monitor and diagnose many diseases and disorders. These markers include electrolytes — salts such as potassium and sodium that get out of balance during dehydration; glucose, a sugar that diabetics need to monitor constantly; and lactate, a potential marker of physical exhaustion or life-threatening sepsis.

Hybrid Cathodes Could Boost Energy Capacity of Lithium Batteries

  • Magazine Article
  • TBMG-34926
Published 2019-08-01 by Tech Briefs Media Group in United States

Today's lithium-ion batteries use cathodes (one of the two electrodes in a battery) made of a transition metal oxide. Batteries with cathodes made of sulfur are considered a promising alternative to reduce weight. Designers of lithium-sulfur batteries face a tradeoff. The cathodes of such batteries are usually made in one of two ways: intercalation or conversion. Intercalation types — which use compounds such as lithium cobalt oxide — provide a high volumetric energy density, packing a lot of punch per volume because of their high densities. These cathodes can maintain their structure and dimensions while incorporating lithium atoms into their crystalline structure.

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Mechanical Behavior of Representative Volume Element Specimens of Lithium-Ion Battery Modules without and with Electrolyte under Quasi-Static and Dynamic In-Plane Compressive Loading Conditions

SAE International Journal of Materials and Manufacturing

University of Michigan, USA-Eui Seop Kim, Shin-Jang Sung, Jwo Pan
University of Ulsan, Republic of Korea-Sung-Tae Hong
  • Journal Article
  • 05-12-03-0014
Published 2019-07-02 by SAE International in United States
Small rectangular representative volume element (RVE) specimens of lithium-ion battery modules without and with electrolyte were tested under quasi-static and dynamic in-plane constrained compressive loading conditions. Effects of electrolyte and loading rate on the compressive behavior of RVE specimens were examined. The test results show that the average buckling stress of the specimens with electrolyte is higher than that of the specimens without electrolyte under both quasi-static and dynamic loading conditions. The test results also show that the average buckling stress of the specimens under dynamic loading conditions is higher than that of the specimens under quasi-static loading conditions, without or with the presence of electrolyte in the specimens. The percentage of increase of the average buckling stress of the specimens due to electrolyte under dynamic loading conditions is more than that of the specimens under quasi-static loading conditions. The percentage of increase of the average buckling stress for the specimens with electrolyte from the quasi-static to dynamic loading conditions is more than that for the specimens without electrolyte.
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Toyota's proven fuel-cell stack reduces cost, complexity in H2 semi-truck

SAE Truck & Off-Highway Engineering: June 2019

Sebastian Blanco
  • Magazine Article
  • 19TOFHP06_14
Published 2019-06-01 by SAE International in United States

Hydrogen proponents likely know that Mirai means “future” in Japanese, but Toyota is only just beginning to explore how important the fuel cell stack in its H2-powered passenger car will be to the future of the company.

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EMBATT looks to double the driving range of EVs

Automotive Engineering: June 2019

Kami Buchholz
  • Magazine Article
  • 19AUTP06_11
Published 2019-06-01 by SAE International in United States

A chassis-integrated sandwich structure of solid electrolytes currently in development is projected to deliver all-electric driving ranges that far out-distance today's typical 200-mile (320 km) EV real-world driving range. IAV, Thyssenkrupp AG and Fraunhofer Institute for Ceramic Technologies and Systems (IKTS) are the core project partners working to develop EMBATT, a chassis-embedded energy technology.

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Impact-Resistant Battery Electrolyte Solidifies When Hit

  • Magazine Article
  • TBMG-34633
Published 2019-06-01 by Tech Briefs Media Group in United States

Lithium-ion batteries commonly used in consumer electronics are notorious for bursting into flame when damaged or improperly packaged. Inspired by the unusual behavior of some liquids that solidify on impact, researchers have developed a practical and inexpensive way to help prevent these fires.

Battery Electrolyte Doubles Driving Range for Electric Vehicles

  • Magazine Article
  • TBMG-34610
Published 2019-06-01 by Tech Briefs Media Group in United States

Conventional electrolytes used in lithium-ion batteries that power household electronics like computers and cellphones are not suitable for lithium-metal batteries. Lithium-metal batteries that replace a graphite electrode with a lithium electrode are the holy grail of energy storage systems because lithium has a greater storage capacity and, therefore, a lithium-metal battery has double or triple the storage capacity. That extra power enables electric vehicles to drive more than two times longer between charges.

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Consideration of Corrosion Behavior of Aluminum Wire at Crimped Terminal and Effective Anti-Corrosion Treatment

Fujikura, Ltd.-Takuya Kawaguchi, Keiji Fukaura, Yuki Nakamura, Makoto Mochizuki, Satoshi Otani
Published 2019-04-02 by SAE International in United States
The demand for weight reduction of vehicles is growing in compliance with CO2 emission control requirements. Also, demand for copper is on the rise with an increase in the number of electric vehicles because their motors and wiring require a lot of copper. This has raised concerns about higher copper prices and vehicle weight. Recently, attempts to reduce vehicle weight have been actively made by partially replacing copper with aluminum, which is lighter and less expensive. Although the use of aluminum wires on limited areas of some vehicles has already been reported, that on all areas has not been reported yet. The authors focus on reducing weight of wiring harnesses, which is about 20 kg per vehicle, and consider using aluminum instead of copper as the conductor of the electrical wires. One of the factors impeding the use of aluminum wires in wider areas is galvanic corrosion occurring at crimped terminals. Since aluminum causes galvanic corrosion when the metal is in electrical contact with a different metal in an electrolyte, it is essential to prevent…
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Modular Biosensor Patch

  • Magazine Article
  • TBMG-34137
Published 2019-04-01 by Tech Briefs Media Group in United States

Researchers are identifying new biomarkers to help monitor cognition and stress in the human body and enhance human performance. Traditional biomarkers like heart rate, temperature, oxygen partial pressure, blood glucose, electrolyte concentration, and others have been correlated with cognition and stress states. However, the correlation is indirect. Molecular biomarkers with stronger and more specific links are preferred.

5 Ws of the SAFIRE Lithium-Ion Battery

  • Magazine Article
  • TBMG-33211
Published 2018-11-01 by Tech Briefs Media Group in United States

The Safe Impact Resistant Electrolyte (SAFIRE) fire-resistant battery can be used in consumer electronics such as cellphones, in drones and cars, and in soldiers’ packs.