Parents of infant who died in wrong-way crash on Ontario's Hwy. 401 were in same vehicle
Ontario’s Special Investigations Unit has released new details about a wrong-way collision in Whitby on Monday night that claimed the lives of four people.
A chance discovery in a Canadian laboratory could help extend the life of laptop, phone and electric car batteries.
According to scientists from Dalhousie University in Halifax, common adhesive tape in batteries may be the reason many devices lose some of their power while off or not being used, which is a phenomenon known as self-discharge.
"In our laboratory we do many highly complex experiments to improve batteries, but this time we discovered a very simple thing," Michael Metzger, an assistant professor in Dalhousie University's physics and atmospheric science department, said in a news release. "In commercial battery cells there is tape—like Scotch tape—that holds the electrodes together and there is a chemical decomposition of this tape, which creates a molecule that leads to the self-discharge."
The solution is simple, too, Metzger says: replace the polyethylene terephthalate, or PET, plastic tape commonly used inside batteries with something more durable and stable.
"It's a commercially relevant discovery," Metzger said. "It's a small thing but it can definitely help improve battery cells."
Metzger and his team have been trying to understand why lithium-ion battery cells in inactive devices tend to lose some of their power and self-discharge, something that has long frustrated consumers and manufacturers alike.
"Every manufacturer of lithium-ion cells in the world wants to make self-discharge as small as possible," Metzger told CTVNews.ca in a joint statement with graduate student Anu Adamson. "In every battery there is a small rate of self-discharge that slowly drains the battery. This is very inconvenient for users and a big headache for industry."
The electrodes that power batteries are separated by an electrolyte solution that is usually a form of lithium. After exposing several battery cells to different temperatures, researchers were surprised to see that electrolyte solution had turned bright red when it normally should be clear, which was something they had never encountered. The discovery was made by Adamson and two other students.
Chemical analysis of the red electrolyte solution revealed that at higher temperatures, a new molecule had been created inside the battery through the decomposition of common PET adhesive tape, which is often used to hold components together inside batteries. Strong and lightweight, PET is also frequently used for plastic packaging, drink bottles, clothing fibres and more.
Researchers realized that the red molecule, dimethyl terephthalate, was acting as a redox shuttle, meaning that it can transport electrons between a battery's positive and negative electrodes, creating self-discharge and depleting power even when a battery is not in use. Ideally, the shuttling of electrons within a battery should only happen when a device is on.
"It's a very simple thing—it is in every plastic bottle and no one would have thought that this has such a huge impact on how the lithium-ion cells degrade," Metzger said in the news release. "It's something we never expected because no one looks at these inactive components, these tapes and plastic foils in the battery cell, but it really needs to be considered if you want to limit side-reactions in the battery cell."
The findings are outlined in a pair of studies published on Jan. 20 and Jan. 23 in the peer-reviewed Journal of The Electrochemical Society. The researchers are now testing PET tape substitutes.
"Since the PET in the tape is the culprit that creates the redox shuttle, we need to replace it with a polymer that is more stable and does not decompose in the harsh chemistry of a lithium-ion battery," Metzger and Adamson told CTVNews.ca. "So far, the results look very promising, and we plan to publish a new research paper on improved polymers for lithium-ion battery tapes soon."
According to the researchers, their work has been attracting interest from "some of the world's largest computer hardware companies and electric vehicle manufacturers," which are eager to reduce self-discharge and improve battery performance.
"We visited some of these companies and they are planning to implement more stable polymers in their battery cells," Metzger said.
In the release, Metzger noted: "One of the engineers said, 'I heard you guys found out something is wrong with PET tape.' So, I explained to him that it's causing this self-discharge and asked him, 'What are you using in your cells?' He said, 'PET tape.'"
Ontario’s Special Investigations Unit has released new details about a wrong-way collision in Whitby on Monday night that claimed the lives of four people.
Three men in Quebec from the same family have fathered more than 600 children.
A British Columbia mayor has been censured by city council – stripping him of his travel and lobbying budgets and removing him from city committees – for allegedly distributing a book that questions the history of Indigenous residential schools in Canada.
A spike in impaired driving-related collisions has caused Ontario’s provincial police to begin enforcing mandatory alcohol screening (MAS) at all traffic stops in the Greater Toronto Area -- a move one civil rights group says is ‘not acceptable.’
William Nylander scored twice and Joseph Woll made 22 saves as the Toronto Maple Leafs downed the Boston Bruins 2-1 on Thursday to force Game 7 in their first-round series.
Jurors in the hush money trial of Donald Trump heard a recording Thursday of him discussing with his then-lawyer and personal fixer a plan to purchase the silence of a Playboy model who has said she had an affair with the former president.
Staff at a small southern Alberta office supply store were shocked to find someone had broken into the business last week, but they were even more confused when they discovered the culprit was a bear.
A federal judge on Thursday sentenced a scuba dive boat captain to four years in custody and three years supervised release for criminal negligence after 34 people died in a fire aboard the vessel.
Fake text message and email campaigns trying to get money and information out of unsuspecting Canadian taxpayers have started circulating, just months after the federal government rebranded the carbon tax rebate the Canada Carbon Rebate.
Three men in Quebec from the same family have fathered more than 600 children.
A group of SaskPower workers recently received special recognition at the legislature – for their efforts in repairing one of Saskatchewan's largest power plants after it was knocked offline for months following a serious flood last summer.
A police officer on Montreal's South Shore anonymously donated a kidney that wound up drastically changing the life of a schoolteacher living on dialysis.
Since 1932, Montreal's Henri Henri has been filled to the brim with every possible kind of hat, from newsboy caps to feathered fedoras.
Police in Oak Bay, B.C., had to close a stretch of road Sunday to help an elephant seal named Emerson get safely back into the water.
Out of more than 9,000 entries from over 2,000 breweries in 50 countries, a handful of B.C. brews landed on the podium at the World Beer Cup this week.
Raneem, 10, lives with a neurological condition and liver disease and needs Cholbam, a medication, for a longer and healthier life.
The lawyer for a residential school survivor leading a proposed class-action defamation lawsuit against the Catholic Church over residential schools says the court action is a last resort.
Mounties in Nanaimo, B.C., say two late-night revellers are lucky their allegedly drunken antics weren't reported to police after security cameras captured the men trying to steal a heavy sign from a downtown business.