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
- Get These High-Capacity Rechargeable Batteries for Under $22 on February 21, 2019 at 1:11 pm
Running out of batteries, for example, is now one of your late fears. Enter the 2600mAH High Capacity Battery Charger. It comes with 8 batteries and a recharging station that will charge up to 4 batte... […]
- You should probably get this $24 iPhone XR battery case instead of Apple’s $129 case on February 21, 2019 at 12:20 pm
Here are some additional details from the product page: 🌟 EXTEND BATTERY LIFE 🌟 — The 5000mAh rechargeable battery case provides up to 120% extra battery capacity whenever you need it ... […]
- Flow Battery Market is Expected to Touch a Value of US$ 1.00 Billion by 2024 on February 21, 2019 at 10:42 am
or like a reversible battery (where an electrical power supply drives regeneration of the fuel). whereas it’s technical blessings over typical rechargeable, like probably divisible liquid tanks and ne... […]
- TAIHE Gemini review: a portable display that won't drain your battery or wallet on February 21, 2019 at 6:00 am
It also happens to have a built-in rechargeable battery, upping the portability factor. I used the Gemini on and off for a couple of weeks in tandem with a few devices to see how well it works and whe... […]
- Big step toward powerful, rechargeable lithium metal batteries on February 21, 2019 at 3:15 am
However, the use of high‐energy‐density Li metal anodes in rechargeable batteries is not possible because of dendrite formation that can potentially result in a battery fire. Last year ... […]
- Apple sued over death blamed on faulty iPad battery on February 18, 2019 at 8:27 am
Apple iPhones and iPads are powered by Lithium-ion rechargeable batteries ... Samsung announced it was recalling millions of its Galaxy Note 7 smartphones over a battery flaw. A few months later, a fi... […]
- Electric Vehicle Battery Market Set for Rapid Growth During by 2024 on February 17, 2019 at 9:20 pm
along these lines any effect on the demand for electric fuelled vehicles can influence the electrical vehicle battery market. An electric vehicle utilizes concoction energy put away in rechargeable ba... […]
- Battery Maker ZAF Energy Systems Gets Investment From Wirtz Manufacturing on February 15, 2019 at 12:45 pm
ZAF Energy Systems Inc., a developer of next-generation battery technology, has received investment ... The added capacity will help ZAF meet growing customer demand for its rechargeable nickel-zinc b... […]
- Shell buys German battery maker Sonnen on February 15, 2019 at 9:23 am
London (AFP) - Anglo-Dutch oil giant Royal Dutch Shell agreed Friday to buy German rechargeable battery maker Sonnen, as the sector eyes growing demand for cleaner energy. Shell, which already investe... […]
via Bing News