Tesla’s Advanced Battery Research Group in Canada, in collaboration with Dalhousie University, has published a paper exploring a new 100-year-old nickel-based battery that outperforms lithium iron phosphate (LFP) in charging and energy density. )Battery. The paper introduces a nickel-based battery chemistry designed to compete with LFP batteries in terms of lifespan, while retaining the favored characteristics of nickel-based batteries, such as higher energy density, allowing electric vehicles to use fewer batteries Achieve longer cruising range.
“The graphite contained is only sufficient for single-crystal Li[Ni0.5Mn0.3Co0.2]O2//graphite (NMC532) operating at 3.8 V (rather than higher or equal to 4.2 V),” the research team wrote in the abstract of the paper. The pouch cells were cycled to 3.65 V or 3.80 V to facilitate comparison with lithium iron phosphate//graphite (LFP) pouch cells under similar conditions of maximum charge point and anode utilization. Use only enough to charge to 3.80 V’s graphite-constructed NMC532 cells have an energy density that surpasses that of LFP cells, and their cycle life at 40°C, 55°C, and 70°C also greatly exceeds that of LFP cells. Electrolytes containing lithium bisfluorosulfonimide (LiFSI) are shown in Excellent lifetime at elevated temperatures, well beyond conventional lithium hexafluorophosphate (LiPF6) electrolytes.” The battery exhibits impressive capacity retention over a large number of cycles.
The team even noted that the new battery described in the paper could last for 100 years if the temperature was controlled at 25°C: “Ultra-high-precision coulometric and electrochemical impedance spectroscopy were used to complement the cycling results and investigate the reasons for the improved performance of NMC batteries. Compared with LFP cells, NMC cells, especially those that were balanced and charged to 3.8V, exhibited better coulombic efficiency, less capacity fading, and higher energy density, with a lifetime at 25°C Expected to be close to a century.” One of the keys appears to be the use of electrolytes containing LiFSI lithium salts, and the paper notes that other nickel-based chemistries offer these advantages, including those with no or very little cobalt. .
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