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OCTOBER 2024 I DESIGN007 MAGAZINE 9 Andy Shaughnessy is manag- ing editor of Design007 Magazine. He has been covering PCB design for 23 years. To read past columns, click here. Because of these trade-offs, designers really should work with their fabricator during the design cycle. is process has entered the mainstream of PCB design because it's a fairly simple way to solve escape routing problems with many of today's tight-pitch BGAs. Any experienced PCB designer, which means most of our readers, can start using this approach right away. But you need to know a few tips, tricks, and techniques first. is month, our expert contributors pro- vide a complete, detailed view of partial HDI. We kick things off with a conversa- tion with IPC's Kris Moyer, who has been teaching partial HDI in his advanced PCB design classes. Next, we have a column by Vern Solberg, who focuses on design- ing with HDI and UHDI. We also have a column by Happy Holden, who discusses partial HDI and several other similar con- structions. Insulectro's Chris Hunrath explains how mSAP can be used in partial HDI, and why most fabricators are capable of creating mSAP features with their existing equip- ment. Siemens' Stephen Chavez breaks down the details of partial HDI from the viewpoint of designers and EDA compa- nies. Joe Fjelstad provides an overview of high-density construction in his usual, unique way. We also have articles by Anaya Vardya and Dean Neuburger, as well as a column by Matt Stevenson. It's show time! Look for our upcoming coverage of the Anaheim Electronics Man- ufacturing Show, PCB West, SMTA Inter- national, and PCB Carolina. DESIGN007 A lithium-ion battery's very first charge is more momentous than it sounds. It determines how well and how long the battery will work from then on– in particular, how many cycles of charging and dis- charging it can handle before deteriorating. In a study published today in Joule, researchers at the SLAC-Stanford Battery Center report that giv- ing batteries this first charge at unusually high cur- rents increased their average lifespan by 50% while decreasing the initial charging time from 10 hours to just 20 minutes. Just as important, the researchers were able to use scientific machine learning to pinpoint specific changes in the battery electrodes that account for this increase in lifespan and performance—invalu- able insights for battery manufacturers looking to streamline their processes and improve their prod- ucts. The study was carried out by a SLAC/Stanford team led by Professor Will Chueh in collaboration with researchers from the Toyota Research Institute (TRI), the Massachusetts Institute of Technology and the University of Washington. The results have practical implications for manu- facturing not just lithium-ion batteries for electric vehicles and the electric grid, but for other tech- nologies, too." The results of this research "demon- strate a generalizable approach for understanding and optimizing this crucial step in battery manufac- turing. (Source: SLAC) Researchers Discover Surprising Way to Jump-start Battery Performance