Chemists from the University of Waterloo have successfully resolved two of the most challenging issues surrounding lithium-oxygen batteries, and in the process created a working battery with near 100 per cent coulombic efficiency.
The new work, which appears this week in Science, proves that four-electron conversion for lithium-oxygen electrochemistry is highly reversible. The team is the first to achieve four-electron conversion, which doubles the electron storage of lithium-oxygen, also known as lithium-air, batteries.
“There are limitations based on thermodynamics,” said Linda Nazar, Canada Research Chair of Solid State Energy Materials and senior author on the project. “Nevertheless, our work has addressed fundamental issues that people have been trying to resolve for a long time.”
The high theoretical-energy density of lithium-oxygen (Li-O2) batteries and their relatively light weight have made them the Holy Grail of rechargeable battery systems. But long-standing issues with the battery’s chemistry and stability have kept them a purely academic curiosity.
Two of the more serious issues involve the intermediate of the cell chemistry (superoxide, LiO2) and the peroxide product (Li2O2) reacting with the porous carbon cathode, degrading the cell from within. In addition, the superoxide consumes the organic electrolyte in the process, which greatly limits the cycle life.
Nazar and her colleagues switched the organic electrolyte to a more stable inorganic molten salt and the porous carbon cathode to a bifunctional metal oxide catalyst. Then by operating the battery at 150 C, they found that the more stable product Li2O is formed instead of Li2O2. This results in a highly reversible Li-oxygen battery with coulombic efficiency approaching 100 per cent.
By storing O2 as lithium oxide (Li2O) instead of lithium peroxide (Li2O2), the battery not only maintained excellent charging characteristics, it achieved the maximum four-electron transfer in the system, thereby increasing the theoretical energy storage by 50 per cent.
“By swapping out the electrolyte and the electrode host and raising the temperature, we show the system performs remarkably well,” said Nazar, who is also a University Research Professor in the Department of Chemistry at Waterloo.
The Latest on: Lithium-oxygen battery
via Google News
The Latest on: Lithium-oxygen battery
- New Breakthrough Could Boost Electric Vehicle Performanceon November 12, 2020 at 6:11 am
Research into other types of battery chemistry, such as lithium-oxygen batteries, or structural batteries in which the material is the energy storage device, could one day lead to additional ...
- Why Most IIoT Predictions are Wrongon November 1, 2020 at 4:00 pm
Researchers agree that one of the most promising possibilities for future battery technology is the lithium-air (or lithium-oxygen) battery, which could provide three times as much power for a ...
- University of Cambridge researchers create new battery technology for first time everon November 1, 2020 at 4:00 pm
Such is the case with a team from the University of Cambridge, which has created the “ultimate” battery: a lithium-oxygen battery that uses graphene electrodes to offer high-density ...
- The U.S. Army Doubles Down On Battery Technologyon October 29, 2020 at 6:55 am
Research into battery chemistry and cost-efficient and ... Others have been trying to make lithium-oxygen batteries a viable energy storage solution by overcoming some of the challenges to the ...
- Giving Lithium Some Airon October 27, 2020 at 5:01 pm
In a lithium air battery, the anode is made from lithium metal ... makes up the cathode is coated with a molybdenum disulfide catalyst to help promote the lithium oxygen reactions while suppressing ...
- Potassium And Oxygen Make A Low-Cost Batteryon October 20, 2020 at 5:00 pm
“the batteries could be more efficient than lithium-oxygen batteries while simultaneously storing about twice the energy as existing lithium-ion batteries.” But, as with so many new battery ...
- Lithium-Air Might Be The Better Batteryon October 18, 2020 at 5:00 pm
Researchers at Cambridge University demonstrated their latest version of what is being called the Lithium-Air battery. It can be more accurately referred to as a Lithium-Oxygen but Air sounds cooler.
- A Lithium ion/Oxygen Hybrid Battery with High-Energy and High-Poweron June 7, 2019 at 6:10 am
A novel lithium ion/oxygen hybrid battery system is proposed to use the advantages and minimize the disadvantages of both lithium-ion battery (LIB) and lithium-oxygen battery (LOB). In it, LOB-part ...
- Another step forward for a promising new battery to store clean energyon May 13, 2019 at 12:08 pm
And it is also important that the battery can be made cheaply. Lithium-oxygen batteries—a possible energy storage solution that is widely considered one of the most viable options—can be expensive, ...
- New 'super battery' could power future electric carson October 30, 2015 at 3:16 am
The new lithium-oxygen battery (not pictured) is said to overcome many of the barriers that currently limit widespread adoption of electric vehicles. The lithium-oxygen battery has 10 times the ...
via Bing News