Engineering · Automotive Engineering
Researchers developed a propylene-carbonate electrolyte that helped a 1-ampere-hour lithium-ion pouch cell operate from −50 to 120°C. The cell remained stable for 2,000 cycles, with an initial charge efficiency of 93.5%.
Researchers developed a thin coating that protected a sulfide solid electrolyte from moisture while preserving much of its ability to conduct lithium ions. In test cells, batteries using the coated material retained 84.6% of their capacity after 1,000 cycles.
Tests of 10 commercial lithium-ion cell types show that chemistry, format and charge level affect thermal runaway—the rapid self-heating failure of a battery cell. Some cell groups released gas in proportion to their stored energy, while cell-to-cell spread was more likely at high charge levels.
Aggressive driving was associated with more than 2.5 times the model-predicted battery capacity fade of eco-driving in a study using real-world electric-vehicle data. The result comes from a physics-based causal-inference framework, not a direct long-term measurement of battery loss.
