Long charging times and limited access to fast chargers can be the dealbreakers for electric vehicle buyers today. But technology advancements are often fast-paced, and it\u2019s hard to predict how close, or far, we are from the next big breakthrough. However, battery scientists at Oak Ridge National Laboratory (ORNL) might have a solution for charging speeds.<\/p>\n
ORNL\u2019s paper highlights a new lithium-ion battery that can not only recharge to 80 percent in 10 minutes but also sustain the fast charging ability for 1500 cycles. For those new to the EV language, battery charge, and discharge occur when ions travel between the positive and negative electrodes through a medium called an electrolyte.<\/p>\n
Fifteen hundred charging cycles isn\u2019t a new development. Tesla CEO Elon Musk tweeted in 2019 that the Model 3\u2019s battery modules were designed to last 1,500 cycles\u00a0or between 300,000 and 500,000 miles.<\/p>\n
ORNL\u2019s team claims to have developed a new type of electrolyte that enables fast charging over a sustained time period. The team developed \u201cnew formulations of lithium salts with carbonate solvents to form an electrolyte\u201d for an improved ion flow over time and the ability to withstand the heat generated by the currents during fast charging.<\/p>\n
\u201cWe found this new electrolyte formulation basically triples the Department of Energy\u2019s target for the lifespan of an extreme-fast-charging battery,\u201d ORNL\u2019s Zhijia Du said. The high-performance electrolyte consists of \u201clithium bis(fluorosulfonyl)imide (LiFSI), lithium hexafluorophosphate (LiPF6), and carbonates in, two amp hour pouch cells.\u201d<\/p>\n
The formula apparently displayed excellent electrochemical stability at a high charging rate of 6C, which translates to one-sixth of an hour, or 10 ten minutes. However, there are many unanswered questions. It\u2019s not clear how much this chemistry would cost to incorporate in an EV battery, and if it can ever be democratized.<\/p>\n
Earlier reports suggested that fast charging impacts a battery’s longevity, but new findings reveal no significant difference\u00a0in battery degradation between EVs that regularly fast charge, and ones that only occasionally fast charge.\u00a0<\/p>\n
Some OEMs appear to be in the advanced stages of battery development. Toyota revealed last week that its future EVs would rely on three new liquid electrolyte battery technologies and one solid-state battery. One of these lithium-ion batteries would be capable of delivering 497 miles of range, and attain 10-80 percent state of charge (SoC) in 20 minutes.<\/p>\n
Several other companies are spearheading advancements in battery technology, including Samsung, Gotion, and CATL among many others.<\/p>\n