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
A higher-energy, safer and longer-lasting zinc battery
on April 18, 2018 at 9:08 am
James Clark School of Engineering has created a water-based zinc battery that is simultaneously powerful, rechargeable, and intrinsically safe. A peer-reviewed paper based on the research was published April 16 in the high-impact journal Nature Materials. […]
Apple Watch 4 killer feature could be a battery-extending attachable
on April 18, 2018 at 8:47 am
In some embodiments the electronic circuitry includes a power transmitting unit that can wirelessly transmit power to charge a rechargeable battery within the wearable electronic device.” It continues: “The power transmitting unit comprises a battery ... […]
This Home Security Camera Has An Impressive 365-Day Battery Life
on April 18, 2018 at 3:12 am
Eufy is Anker’s new smart home brand, and the EverCam is unique because it has a built-in 13,400mAh lithium-ion rechargeable battery, giving each camera a 365-day battery life. That’s right. Unlike most other smart home security cameras, made by Amazon ... […]
Researchers finally invented a battery that won’t explode when it fails
on April 17, 2018 at 8:31 am
Now, researchers from the University of Maryland have partnered up with scientists from the US Army Research Laboratory and the National Institute of Standards and Technology to develop a new type of rechargeable battery that swaps out the potentially ... […]
This top-selling 4K action cam comes with an extra battery and a dozen accessories for $53
on April 16, 2018 at 6:20 pm
Dual Recharger Batteries + Mounting Accessories Kits Increased Long Battery Life up to 180 minutes (Dual Rechargeable Lithium Batteries) shooting time.Come along with tons of free accessories. multifunctional accessories enable you to mount your camera ... […]
Double your battery life with Amazon’s slimmest iPhone X battery case, now just $26
on April 16, 2018 at 3:05 pm
and there are a million different battery cases out there for the iPhone X. One of our favorites is definitely the Zohmo Rechargeable Backup Charging Case for iPhone X, which just so happens to be the slimmest iPhone X battery case on Amazon. It still ... […]
'Urban mining' in South Korea pulls rare battery materials from recycled tech
on April 13, 2018 at 8:51 am
POSCO (005490.KS) processes lithium phosphate from SungEel to produce lithium carbonate for rechargeable battery makers LG and Samsung, according to SungEel and POSCO. The battery recycler plans to increase its processing capacity to 24,000 tonnes by 2019 ... […]
Lithium-Ion Battery Market Size & Share to Surpass US $67.70 billion by 2022
on April 13, 2018 at 2:08 am
A lithium-ion battery or Li-ion battery is a rechargeable battery wherein lithium ions move from the cathode to the anode during discharge and back when charging. Li-ion batteries use an intercalated lithium compound as one electrode material ... […]
Shell Canada delves into vanadium flow battery technology
on April 12, 2018 at 3:39 pm
But who knew vanadium could be used in making a rechargeable flow battery to store chemical potential energy? A vanadium redox flow battery, or vanadium flow battery is a type of rechargeable flow battery that employs vanadium ions in different oxidation ... […]
via Bing News