Transport of charge in electrodes for lithium-ion batteries is complex. For accurate description one needs to use a multilevel approach which addresses processes on different scales - from the ones ...occurring inside active nanoparticles to those governing the transport in composite electrodes or in separators of sub-millimeter thickness. Here we attempt an approximation that allows for a fast estimation of the rate-limiting step in given electrochemical cell. Despite thoroughly simplified description of transport, the method gives suprisingly good prediction of polarisation resistance as a function of charge/discharge rate and of the electrode thickness. The method might be helpful for fast evaluation of new materials or new electrode designs in everyday laboratory testing.
Traditional telephone access network is complicated to operate for the huge line network. Considering the heavy wiring work and the access requirements of the local telephone network access system in ...the engine room, a solution based on MSTP (Multi-Service Transfer Platform) technology is proposed on the basis of the existing equipments. This paper describes the core technology in the program. This program can save resources, at the same time, the system is convenient to maintain and easy to operate which can greatly improve the work efficiency. Therefore, it deserves to be popularized in the similar network system.
Describes a statewide project in South Dakota to wire its elementary and secondary school classrooms for distance education courses. Discusses the use of minimum-security inmates from state prisons ...to do the wiring; the rural environment; the governor's role; upgrading the electrical infrastructure; security concerns; political issues; inmate training; and work quality. (LRW)
Remodeling the Media Center Baule, Steven M
The Book report (Columbus, Ohio),
05/1998, Letnik:
17, Številka:
1
Journal Article
Discusses items that need to be considered when remodeling a school media center. Highlights include space and location for various functions, including projections of print versus electronic media; ...electrical and data wiring needs; lighting; security and supervision; and reuse of existing furniture and equipment. (LRW)
This case study describes the planning, funding, and implementation of a complete data-wiring renovation at the University of California, Santa Cruz library. Highlights include design principles; ...project schedule; benefits for staff's electronic mail and network use and for upgraded public terminals; and the importance of planning and communication. (three references) (LRW)
In this work, exhaustive characterizations of 3D geometries of LiNi1/3Mn1/3Co1/3O2 (NMC), LiFePO4 (LFP), and NMC/LFP blended electrodes are undertaken for rational interpretation of their measured ...electrical properties and electrochemical performance. X‐ray tomography and focused ion beam in combination with scanning electron microscopy tomography are used for a multiscale analysis of electrodes 3D geometries. Their multiscale electrical properties are measured by using broadband dielectric spectroscopy. Finally, discharge rate performance are measured and analyzed by simple, yet efficient methods. It allows us to discriminate between electronic and ionic wirings as the performance limiting factors, depending on the discharge rate. This approach is a unique exhaustive analysis of the experimental relationships between the electrochemical behavior, the transport properties within the electrode, and its 3D geometry.
Multiscale characterizations of 3D geometries and electrical properties of Li‐ion electrodes made of LiNi1/3Mn1/3Co1/3O2 (NMC), LiFePO4 (LFP), and NMC/LFP blend allow the rational interpretation of their electrochemical performance by discriminating between electronic and ionic wirings as the performance limiting factors, depending on the discharge rate.
Discussion of building new library facilities focuses on reflections of what could be done differently after a building is completed, based on experiences at Winona State University. Topics include ...windows; emergency exits; wired study furniture for portable computing; rest rooms; compact shelving; OPAC terminals; elevators; and functionality. (LRW)
A better understanding of the charge transport (ions and electrons) kinetics limitations through the electrode is required to improve the Li‐ion battery's energy and power density in view of ...electrical cars deployment. In article number 1602239, Bernard Lestriez and co‐workers connect for the first time the parameters describing the microstructure of electrodes with both measurements of their transport properties and their electrochemical performance.
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