“We present a wide range of testing results on an excellent moderate-energy-density lithium-ion pouch cell chemistry to serve as benchmarks for academics and companies developing advanced lithium-ion and other “beyond lithium-ion” cell chemistries to (hopefully) exceed. These results are far superior to those that have been used by researchers modelling cell failure mechanisms and assuch, these results are more representative of modern Li-ion cells and should be adopted by modellers. Up to three years of testing has been completed for some of the tests. Tests include long-term charge-discharge cycling at 20, 40 and 55°C, long-term storage at 20, 40and 55°C, and high precision coulometry at 40°C. Several different electrolytes are considered in this LiNi0.5Mn0.3Co0.2O2 / graphite chemistry, including those that can promote fast charging. The reasons for cell performance degradation and impedance growth are examined using several methods. We conclude that cells of this type should be able to power an electric vehicle for over 1.6 million kilometers (1 million miles) and last at least two decades in grid energy storage…

…Single crystal NMC532 / graphite cells with exceptional lifetime have been developed. Storage and cycle testing up to 3 years in duration has been presented at 20, 40 and 55°C. The lifetime of these cells far exceeds that of other NMC / graphite cells reported in the literature and which have been used for lifetime modelling. It is suggested that lifetime models for NMC532 / graphite cells consider the data presented here.

Rochelle Weber, et al. “A Wide Range of Testing Results on an Excellent Lithium-Ion CellChemistry to be used as Benchmarks for New Battery Technologies.” Journal of the Electrochemical Society. 166(13) A3031-A3044 (2019)

Batteries that can last two decades will not only change the automotive industry, but the energy industry as well. More general discussion is available on CleanTechnica.