Supercharged Success: Battery Researcher Jeff Dahn Wins Herzberg Gold Medal
On the third floor of Dalhousie’s Dunn Building, you’ll find the labs of the Jeff Dahn Research Group, spanning several rooms of blinking lights and buzzing machines. There, you’ll also find Dr. Dahn’s office: a tiny space mostly used to hold boxes upon boxes of batteries for testing. (It’s fair to assume Dr. Dahn spends most of his time in the labs.)
On the office’s wall hang two Calvin and Hobbes cartoons — a personal favourite of the world-renowned Dal battery researcher. One in particular stands out: originally published in July 1987, the comic strip finds Calvin outraged over garbage and litter, and how humans treat the planet more generally.
“That’s what it’s all about, right here,” says Dr. Dahn, who says his continuing quest to build better, longer-lasting batteries has always been informed by an environmental consciousness.
“We can’t just keep burning fossil fuels; we’re going to heat the planet into death. And if you like the sea shore, and you want to continue to have land that you currently see not be submerged, you have to do something about it.”
For more than 35 years, Dr. Dahn has been at the forefront of research and innovation in battery technology. Through a mixture of fundamental and applied research, the work of his team can be found in some lithium-ion rechargeable batteries used in power tools, electric vehicles and other devices around the world today. Now, collaborating with Tesla as an industrial research chair, his lab is helping improve lithium-ion cells for electric vehicles and energy storage.
And on Tuesday (February 7), that body of work was recognized with the highest scientific honour in Canada.
“Dal’s Herzberg Canada Gold Medal recipients exemplify research excellence in Canada,” says Martha Crago, Dalhousie’s vice-president research. “In Dr. Dahn’s case, his leading work in materials science and lithium-ion batteries has attracted the attention of many all over the world and launched him into a class of his own.”
Dr. Dahn says he was “stunned” when he heard he would be receiving the Herzberg, which comes with a $1-million research prize.
“It was pretty flattering, and the award will support our research going forward,” he says. “We’ll use it wisely.”
He adds the Herzberg Gold Medal award to an impressive set of awards and honours throughout his career. They include the inaugural Governor General’s Innovation Award (2016), the Yeager award from the International Battery Materials Association (2016), induction into Nova Scotia's Science Hall of Fame (2016), fellowship in the Royal Society of Canada (2001). He even has a second Herzberg award — a different medal, also named after Nobel-winning German-Canadian physicist Gerhard Herzberg, from the Canadian Association of Physicists.
“Writing the book” on Li-ion batteries
Dr. Dahn first came to Nova Scotia at age 13, emigrating with his family from Connecticut. He studied Physics at Dalhousie as an undergrad before completing his PhD at the University of British Columbia. He worked at the National Research Council of Canada, Moli Energy Limited and Simon Fraser University before returning to Dalhousie in 1996 as the NSERC/3M Canada Industrial Research Chair in Materials for Advanced Batteries. (Since 2003, he’s also been the Canada Research Chair in Battery and Fuel Cell Materials.)
From the beginning, his research focused on the science of batteries and energy storage. In the 1980s, researchers were beginning to explore using lithium compounds as the core electrode materials in lithium batteries. Today, lithium-ion batteries — which don’t actually contain lithium metal at all — power rechargeable devices of all sorts, from cell phones and laptops to tools and electric vehicles.
“We wrote some of the very important papers on lithium-ion batteries in the very beginning,” says Dr. Dahn of his early career, highlighting his work at Simon Fraser characterizing which carbon compounds could effectively serve as the negative electrode. “We sort of wrote the book on what type of carbon you should use in a lithium-ion battery to make the best one.”
It was at Dalhousie, though, where Dr. Dahn and his team would make perhaps their most significant contribution to lithium-ion batteries. Post-doc Zhonghua Lu, graduate student Dean MacNeil and Dr. Dahn developed certain grades of lithium nickel-manganese-cobalt (NMC) oxide compounds, ones that when used as the positive electrode, increase the safety and stability of the batteries at larger sizes.
Seventeen years later, these grades of NMCs are widely used in power tool and electric car batteries around the world — and represent several of the 65 or so inventions that his team has patented. And 3M (Dahn's industrial partner at the time) has licensed the use of these NMC grades for commercial use to many companies around the world.
Dr. Dahn’s team has also made significant contributions to research on lithium-ion battery lifetimes: understanding what causes lithium-ion cells to die, and how to get them to last even longer.
“A cell phone battery only needs to last three or four years and then the phone is changed for a new model,” says Dr. Dahn. “Power tools are the same thing; you can just get a replacement pack. But once the batteries start to get big — like in electric vehicles — they cost a lot, so they have to last a long time.”
Graduate student Chris Burns and research associate David Stevens, who were involved in this research, created the Dartmouth-based spin-out Novonix. The company produces ultra high-precision charger devices — the sort that allow their customers to predict lifespans of Li-ion cells on the scale of not just years, but decades.
“It’s amazing to have such a world-renowned researcher within the field of batteries here at Dalhousie,” says Chris Burns, Novonix co-founder, who completed both his master’s and doctoral degrees with Dr. Dahn’s group. “He provides a foundation for students to learn and work at the cutting edge of an exciting field with access to top tier industrial collaboration around the world, which is an amazing opportunity within an academic group.”
Indeed, Dr. Dahn — who, even with his two research chairs, has taught first-year Physics classes at Dal for more than 20 years — says his proudest achievements are in the careers of the graduates who’ve come out of his lab.
“I’ve trained a lot of graduate students — probably over 50 PhDs, 20 to 25 postdocs. And virtually all of them have gone on to careers in the battery materials or lithium-ion battery space… Some are millionaires because they’ve formed their own companies and done really well. A lot of them are vice-presidents research or chief technical officers and so on.
“It makes me really proud, what these folks have accomplished after they’ve left the group.”
A new era with Tesla
After helping lay the basic scientific foundation for lithium-ion batteries in the 1980s, the bulk of Dr. Dahn’s career has been in close collaboration with dedicated industry partners. It’s a path that’s allowed him to focus his research on applied solutions to the problems faced by battery manufacturers.
“Working together with industry ensures that, if you want to have a long-term relationship [with them], that we’re doing something useful,” he explains. “And why not do something useful, when you have a chance to do anything you want?”
His latest collaboration, launched in 2016, is with Tesla as the NSERC/Tesla Canada Industrial Research Chair. The company is one of the largest manufacturers of the electric vehicles in the world and its new Gigafactory, based in Nevada, is bringing roughly one-third of global lithium-ion battery production to North America. But when it came time for the company to sign its first ever university research partnership, it went north — and east — to Jeff Dahn’s door.
Tesla — which aims to not only improve electric vehicles, but “accelerate the world’s transition to sustainable energy” more broadly — signed-off on a five-year exclusive collaboration with Dr. Dahn’s lab, focused on increasing the lifetime, decreasing the cost and improving the energy density of lithium-ion batteries.
“The goals are really simple, but the problems are hard,” explains Dr. Dahn. “The area is of such importance, and the problems are so interesting and challenging that it’s fun.”
Some of the lab’s work could be incorporated into the company’s products shortly — perhaps within a year, Dr. Dahn speculates. As he talks about the future of renewable energy, and the vision of mass-scale energy storage, there’s an incredible enthusiasm in his voice. He sees a better future for how we power our planet — and it’s a future he and his students are helping build.
It’s really cool,” says Dr. Dahn. “My students, I hope, are getting a sense of just how cool it is.”