PNNL scientists spice up electrolyte solution to increase charge cycles
When it comes to the special sauce of batteries, researchers at the Department of Energy’s Pacific Northwest National Laboratory have discovered it’s all about the salt concentration. By getting the right amount of salt, right where they want it, they’ve demonstrated a small lithium-metal battery can re-charge about seven times more than batteries with conventional electrolytes.
A battery’s electrolyte solution shuttles charged atoms between electrodes to generate electricity. Finding an electrolyte solution that doesn’t corrode the electrodes in a lithium-metal battery is a challenge but the PNNL approach, published online in Advanced Materials, successfully creates a protective layer around the electrodes and achieves significantly increased charge/discharge cycles.
Conventional electrolytes used in lithium-ion batteries, which power household electronics like computers and cell phones, are not suitable for lithium-metal batteries. Lithium-metal batteries that replace a graphite electrode with a lithium electrode are the ‘holy grail’ of energy storage systems because lithium has a greater storage capacity and, therefore, a lithium-metal battery has double or triple the storage capacity. That extra power enables electric vehicles to drive more than two times longer between charges.
Adding more lithium-based salt to the liquid electrolyte mix creates a more stable interface between the electrolyte and the electrodes which, in turn, affects the life of the battery. But that high concentration of salt comes with distinct downsides — including the high cost of lithium salt. The high concentration also increases viscosity and lowers conductivity of the ions through the electrolyte.
“We were trying to preserve the advantage of the high concentration of salt, but offset the disadvantages,” said Ji-Guang “Jason” Zhang, a senior battery researcher at PNNL. “By combining a fluorine-based solvent to dilute the high concentration electrolyte, our team was able to significantly lower the total lithium salt concentration yet keep its benefits.”
In this process, they were able to localize the high concentrations of lithium-based salt into “clusters” which are able to still form protective barriers on the electrode and prevent the growth of dendrites — microscopic, pin-like fibers — that cause rechargeable batteries to short circuit and limit their life span.
PNNL’s patent-pending electrolyte was tested in PNNL’s Advanced Battery Facility on an experimental battery cell similar in size to a watch battery. It was able to retain 80 percent of its initial charge after 700 cycles of discharging and recharging. A battery using a standard electrolyte can only maintain its charge for about 100 cycles.
Researchers will test this localized high concentration electrolyte on ‘pouch’ batteries developed at the lab, which are the size and power of a cell phone battery, to see how it performs at that scale. They say the concept of using this novel fluorine-based diluent to manipulate salt concentration also works well for sodium-metal batteries and other metal batteries.
The Latest on: Rechargeable battery
via Google News
The Latest on: Rechargeable battery
- Graber Introduces Innovations In Motorization: Virtual Cord™ App And Rechargeable Battery Power Options For Motorized Shadeson November 19, 2019 at 11:28 am
In addition, its motorized products have been enhanced with new rechargeable battery packs, that holds up to 20 percent more battery charge than other motors.* "Our new Virtual Cord app not only ...
- Research extends life of rechargeable batterieson November 18, 2019 at 1:39 pm
Western-led research may ‘charge up’ consumers by addressing their frequent complaint that rechargeable batteries gradually hold less charge over time. The solution to longer battery life, researchers ...
- Rechargeable batteries in your favorite devices can ignite and burn down your houseon November 18, 2019 at 4:00 am
A Lake Worth Beach family received a sobering lesson of the batteries’ destructive power in November 2018 after Elijah Oliphant disconnected a battery from the Monmouth electric bicycle he bought that ...
- Best Rechargeable Batterieson November 14, 2019 at 12:06 pm
Rechargeable batteries are a convenient, fast, and easy to way to avoid purchasing brand new batteries every other month. They’re also particularly useful for gamers who need a quick battery re-up or ...
- Li-ion Power Battery Market to enjoy ‘explosive growth’ to 2025 | Samsung, BYD, Panasonic, Sony, LGon November 14, 2019 at 11:07 am
A Li-ion battery or lithium-ion battery, a type of rechargeable battery that is commonly used for portable electronics and electric vehicles as well as gaining huge popularity in military and ...
- Climate Central Solutions Brief: Battery Energy Storageon November 13, 2019 at 7:47 am
Also, rechargeable batteries are powering the rise in plug-in electric vehicles ... Lithium-ion batteries currently have the highest energy and power densities among alternative battery chemistries, ...
- Climate Lessons: Rechargeable batteries are toxic, so I'm building my ownon November 10, 2019 at 3:26 pm
ANALYSIS: When I heard a few weeks ago that the Nobel Prize in Chemistry was awarded to the pioneers of lithium-ion battery research, I wondered: how different would my day-to-day life be without ...
- Amazon is selling battery-operated heated underwear to keep you warm this winteron November 10, 2019 at 2:01 am
TEMPERATURES plummeted this week but Amazon think they have the solution - heated pants. The Smart Heated Panties are rechargeable and battery powered, with a 12-hour life span on the 'winter warmer' ...
- Streamlight introduces USB rechargeable sycloneon November 8, 2019 at 4:06 pm
And because it uses a USB rechargeable battery, the Syclone also offers extremely low operating costs.” The new work light features six output modes, including three spot and three flood settings. In ...
via Bing News