On Mon, 5 Nov 2018 at 13:56, James Cameron wrote: > Thanks, interesting. > > Specific electrolyte additives and temperature control in the field > are critical to product longevity. > > Paraphrasing a new rule of use; minimise temperature while battery > voltage is high. > > Or even simpler; minimise voltage, and minimise temperature. > > He describes the underlying causes and methods to test for the > mechanism of degradation. Measuring the heat gain or loss during a > cycle is nice. > > I'm not intuitively comfortable with his assertion that cycle life is well > (if not linearly) correlated with coulombic efficiency. LiFePO4 at least start at somewhere over 99% when new and IMPROVE with time= .. (Note that although Li cell charge/discharge energy efficiency is high compared to most otrher systems, coulombic and energy efficiencies do not track well, alas.) Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .