Exposing cathodes to light decreases charge time by a factor of two in lithium-ion batteries.
Researchers at the U.S. Department of Energy’s (DOE) Argonne National Laboratory have reported a new mechanism to speed up the charging of lithium-ion batteries for electric vehicles. Simply exposing the cathode to a beam of concentrated light — for example, the white light from a xenon lamp — lowers the battery charging time by a remarkable factor of two or more. If commercialized, such technology could be a game changer for electric vehicles.
Owners of electric vehicles are well aware of “range anxiety” as the charge level runs low or the location of the closest charging station seems too distant. Fast charging remains a critical challenge if such vehicles are ever to capture a large segment of the transportation market. Charging for an electric car on empty typically takes about eight hours.
“We wanted to greatly shorten this charge reaction without damaging the electrodes from the resulting higher current flow.” — Christopher Johnson, Argonne Distinguished Fellow
Special supercharging stations now exist that achieve ultrafast charging of electric vehicles by delivering a much higher current to the battery. Passing too much current over too short a time, however, degrades battery performance.
Typically, lithium-ion batteries for vehicles are slowly charged to obtain a complete electrochemical reaction. This reaction involves removing lithium from the oxide cathode and inserting it into the graphite anode.
“We wanted to greatly shorten this charge reaction without damaging the electrodes from the resulting higher current flow,” said Christopher Johnson, Argonne Distinguished Fellow and group leader in the Chemical Sciences and Engineering division.
Today’s lithium-ion batteries work in a dark state, with the electrodes housed in a case. Argonne’s photo-assisted technology would use a transparent container that allows concentrated light to illuminate the battery electrodes during charging.
To probe the charge process, the research team crafted small lithium-ion cells (“coin cells”) with transparent quartz windows. They then tested these cells with and without white light shining through the window onto the cathode.
?“We hypothesized that, during charging, white light would interact favorably with the typical cathode material, and that proved to be the case in our cell tests,” Johnson said. That cathode material is a lithium manganese oxide, abbreviated as LiMn2O4 (LMO).
The key ingredient in this favorable reaction is the interplay of light with LMO, a semiconducting material known to interact with light. While absorbing the photons in the light during charging, the element manganese in the LMO changes its charge state from trivalent to tetravalent (Mn3+ to Mn4+). In response, lithium ions eject faster from the cathode than would occur without the photon-excitation process.
This condition drives the battery reaction faster. The team found that the faster reaction resulted in faster charging without degrading battery performance or cycle life. ?“Our cell tests showed a factor of two decrease in charging time with the light turned on,” Johnson said.
The Latest on: Battery charging
via Google News
The Latest on: Battery charging
- Ambrane Power Bank With 27000mAh Battery To Take On Xiaomi, Equipped With 12 Layers Of Protectionon October 12, 2021 at 12:52 pm
Ambrane Power Bank comes with a 27000mAh battery. You can also carry it with you on a flight and it is certified by the Bureau of Indian Standards.
- Charging An Electric Car: Your Questions Answeredon October 12, 2021 at 12:00 pm
Sales of battery-powered electric vehicles rocketed in September 2021 to their highest ever share of the new car sales market, according to the Society of Motor Manufacturers & Traders, with hybrid ...
- Tritium Partners with ChargeNet to bring electric vehicle fast charging to bay area Taco Bellson October 12, 2021 at 11:26 am
As part of a larger initiative to put electric vehicle fast chargers at fast food restaurants, a first installation is expected to combine Tritium’s market-leading technology with on-site solar, ...
- DUI, Battery: Lemont Police Reportson October 12, 2021 at 9:18 am
Find out what's happening in Lemont with free, real-time updates from Patch. Let's go! Leonas Jalauskas, 60, of Willowbrook, was charged with DUI-alcohol, operation of an uninsured motor vehicle, ...
- Nokia G300 packing a Snapdragon 480 5G SoC, 4,470mAh battery goes officialon October 12, 2021 at 9:13 am
HMD Global licensee of the Nokia smartphone brand has announced the Nokia G300 smartphone. The device has been a regular in leaks in recent times was expected to launch in the early weeks of October.
- Motorola Edge 5G UW (2021) review: Battery life for days, and a super fast displayon October 12, 2021 at 6:00 am
The Motorola Edge 5G UW is a very strong midrange phone thanks to the 144Hz display, decent camera, and fantastic battery life.
- Cost of charging an electric car and what happens if it runs out of batteryon October 12, 2021 at 5:11 am
As more drivers appear to be moving across to electric, we explain what you need to know about EVs (electric vehicles) including what happens when they run out of charge ...
- Former UFC champ Chuck Liddell arrested on domestic battery chargeon October 11, 2021 at 6:10 pm
Former UFC champ Chuck Liddell was arrested and charged with domestic battery following a disturbance at his Southern California home early Monday, authorities said. Liddell denies the accusations.
- Why fast charging reduces the capacity of a car batteryon October 7, 2021 at 10:00 am
When lithium ions are forced rapidly through a battery, they might get stuck and turn into lithium metal, no longer able to move through the battery.
- Dawn of the 900-kW EV ultra-charger, and a battery that can handle iton October 7, 2021 at 12:19 am
How fast does an EV charger have to be to completely eliminate range anxiety – and can our power grids cope with ultra-chargers drawing 0.9 megawatts at full blast? It seems we're going to find out.
via Bing News