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Last April, Elon Musk promised that  Tesla would soon be able to power its electric cars for more than 1  million miles over the course of its lifespan. At the time, the claim  seemed a bit much. That’s more than double the mileage current Tesla  owners can expect to get out of their car’s battery packs, which are  already well beyond the operational range of most other EV batteries. It  just didn’t seem real—except now it appears that it is.  
A.  Paul Gill, CEO of Lomiko Metals (TSXV: LMR, OTCQB: LMRMF) stated “If  we’re going to continue to expand the electric vehicle industry in  Europe and  North America, we need a secure supply of raw  materials.â€,stated Gill. “The shortage of graphite is going to be a real  concern in the coming years.â€,he added.   
 Earlier  this month, a group of battery researchers at Dalhousie University,  which has an exclusive agreement with Tesla, published a paper in The Journal of the Electrochemical Society describing  a lithium-ion battery that “should be able to power an electric vehicle  for over 1 million miles†while losing less than 10 percent of its  energy capacity during its lifetime. 
 Led  by physicist Jeff Dahn, one of the world’s foremost lithium-ion  researchers, the Dalhousie group showed that its battery significantly  outperforms any similar lithium-ion battery previously reported. They  noted their battery could be especially useful for self-driving robotaxis and long-haul electric trucks, two products Tesla is developing. 
 What’s  interesting, though, is that the authors don’t herald the results as a  breakthrough. Rather, they present it as a benchmark for other battery  researchers. And they don’t skimp on the specifics. 
 “Full  details of these cells including electrode compositions, electrode  loadings, electrolyte compositions, additives used, etc. have been  provided,†Dahn and his colleagues wrote in the paper. “This has been  done so that others can recreate these cells and use them as benchmarks  for their own R+D efforts.†
 Within the EV industry, battery chemistries are  a closely guarded secret. So why would Dahn’s research group, which  signed its exclusive partnership with Tesla in 2016, give away the  recipe for such a seemingly singular battery? According to a former  member of Dahn’s team, the likely answer is that Tesla already has at  least one proprietary battery chemistry that outperforms what’s  described in the benchmark paper. Indeed, shortly after the paper came  out, Tesla received a patent for  a lithium-ion battery that is remarkably similar to the one described  in the benchmarking paper. Dahn, who declined to comment for this  article, is listed as one of its inventors. 
 The  lithium-ion batteries described in the benchmark paper use lithium  nickel manganese cobalt oxide, or NMC, for the battery’s positive  electrode (cathode) and artificial graphite for its negative electrode  (anode). The electrolyte, which ferries lithium ions between the  electrode terminals, consists of a lithium salt blended with other  compounds. 
 NMC/graphite  chemistries have long been known to increase the energy density and  lifespan of lithium-ion batteries. (Almost all electric car batteries,  including the Nissan Leaf and Chevy Bolt, use NMC chemistries, but  notably not Tesla.)  The blend of electrolyte and additives is what ends up being the  subject of trade secrets. But even those materials, as described in the  paper, were well known in the industry. In other words, says Matt Lacey,  a lithium-ion battery expert at the Scania Group who was not involved  in the research, “there is nothing in the secret sauce that was secret!†
 Instead,  Dahn’s team achieved its huge performance boosts through lots and lots  of optimizing of those familiar ingredients, and tweaking the  nanostructure of the battery’s cathode. Instead of using many smaller  NMC crystals as the cathode, this battery relies on larger crystals. Lin  Ma, a former PhD student in Dahn’s lab who was instrumental in  developing the cathode design, says this “single-crystal†nanostructure  is less likely to develop cracks when a battery is charging. Cracks in  the cathode material cause a decrease in the lifetime and performance of  the battery. 
 Through  its partnership with Tesla, Dahn’s team was tasked with creating  lithium-ion batteries that can store more energy and have a longer  lifetime than commercially available batteries. In electric cars, these  metrics translate to how far you can drive your car on a single charge  and how many charges you can get out of the battery before it stops  working. Generally speaking, there’s a trade-off between energy density  and battery lifetime—if you want more of one, you get less of the other.  Dahn’s group was responsible for the seemingly impossible task of  overcoming this tradeoff. The energy density of a lithium ion battery is one of the most important qualities in consumer electric cars like Tesla’s Model 3. Customers want to be able to drive long distances in a single charge. Tesla’s newer cars can get up to 370 miles per charge,  which is well beyond the range of electric vehicles from other  companies. In fact, based on the average American commute, Dahn  estimates that most EV owners only use about a quarter of a charge per  day. But to make a fleet of robotaxis or an empire of long haul electric  trucks, Tesla will need a battery that can handle full discharge cycles  every day. The  problem is that fully discharging and recharging everyday puts greater  stress on the battery and degrades its components more rapidly. But  simply maintaining the current lifespan of a Tesla battery pack— about 300,000 to 500,000 miles—isn’t  enough either. Long haul electric trucks and robotaxis will be packing  in way more daily miles than your average commuter, which is why Musk  wants a battery that can last for one million miles. Musk  asked and Dahn delivered. As Dahn and his team detailed in their  benchmarking paper, “one does not need to make a tradeoff between energy  density and lifetime anymore.†The team’s results show that their  batteries could be charged and depleted over 4,000 times and only lose  about 10 percent of their energy capacity. For the sake of comparison, a paper from 2014 showed that similar lithium-ion batteries lost half their capacity after only 1,000 cycles 
 “4,000  cycles is really impressive,†says Greg Less, the technical director at  the University of Michigan’s Energy Institute battery lab. “A million  mile range is easily doable with 4,000 cycles.†Just  days after the publication of the benchmarking paper, Tesla and Dahn  were awarded a patent that described a single-crystal lithium-ion  battery almost identical to the batteries described in the benchmarking  paper. The patented battery includes an electrolyte additive called ODTO  that the patent claims can “enhance performance and lifetime of Li-ion  batteries, while reducing costs.†
 It’s  not certain that the battery described in the patent is the  million-mile battery that Musk said would enter production next year,  and neither Tesla nor Dahn are talking. But it’s a safe bet that Tesla’s  proprietary battery performs even better. 
 Shirley  Meng, who runs the Laboratory for Energy Storage and Conversion at the  University of California, San Diego, says many electric vehicle  companies are pursuing batteries with higher nickel content than what  Dahn’s paper and patent describe. That approach can boost the energy  density of a battery. Meng says the next step is to merge those  higher-density designs with some high-performing mix of electrolytes and  additives. Whether it’s the formula Dahn’s group perfected is an open  question. 
 “I  believe the ultimate goal of Jeff’s team is to demonstrate ultralong  life in a high-nickel-content cathode, but perhaps they need a  completely different mixture of the electrolyte additive cocktail,†Meng  says. “I don’t think the same formula will work, and that’s why they  released all the formulations.†
 Whatever  design ends up making it into production at Tesla’s massive  Gigafactory, the signs are clear: A million-mile battery will be here  soon. 












