Adding r:200mi 2an EV in 10min @elevated temperature> (trolling4$)

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Adding r:200mi 2an EV in 10min @elevated temperature> (trolling4$)

Electric Vehicle Discussion List mailing list


https://revolution-green.com/10-minute-electrical-vehicle-recharge/
In and out with 10-minute electrical vehicle recharge
Oct 31, 2019  

[image  / Chao-Yang Wang Group
https://scx2.b-cdn.net/gfx/news/hires/2019/2-lithiumionba.jpg
A fast charging battery invented by Chao-Yang Wang Group
]

Scientist have developed a lithium ion battery that charges at an elevated
temperature to increase reaction rate but keeps the cell cool during
discharge, showing the potential to add 200 miles of driving range to an
electric car in 10 minutes. If scaled, the design is one potential strategy
to alleviate concerns that all-electric vehicles lack sufficient cruise
range to safely reach a destination without stalling mid-journey.

Scientists have recognized the need to design electric vehicle batteries
capable of charging extremely fast in order to meet the needs of drivers.
However, such a speedy charge rate would require a battery to rapidly take
in 400 kilowatts of energy, a feat that current vehicles cannot accomplish
because it risks lithium plating (the formation of metallic lithium around
the anode), which would severely deteriorate battery life.

While conventional lithium batteries are charged and discharged at the same
temperature, the researchers found they could circumvent the lithium plating
issue by charging the battery to an elevated temperature of 60 degrees
Celsius for a few minutes, then discharging it at cooler temperatures.

“In addition to fast charging, this design allows us to limit the battery’s
exposure time to the elevated charge temperature, thus generating a very
long cycle life,” says senior author Chao-Yang Wang, a mechanical engineer
at The Pennsylvania State University. “The key is to realize rapid heating;
otherwise, the battery will stay at elevated temperatures for too long,
causing severe degradation.”

In order to shorten heat time and heat the entire battery at a uniform
temperature, Wang and colleagues outfitted a lithium ion battery design with
a self-heating nickel structure that preheats in less than thirty seconds.
To test their model, they charged three graphite pouch cells designed for
hybrid electric vehicles at 40, 49, and 60 degrees Celsius, as well as a
control at 20 degrees Celsius, using various cooling strategies to maintain
constant charge temperatures. To confirm that lithium plating did not occur,
they later fully discharged the cells and opened them for analysis.

Wang and the team found that the batteries preheated to 60 degrees Celsius
could sustain the extremely fast charging process for 1,700 cycles, while
the control cell could only keep pace for 60 cycles. At an average charge
temperature between 49 and 60 degrees Celsius, the research did not observe
any lithium plating. The researchers also observed that an increased charge
temperature greatly reduced the cooling necessary to maintain the cell at
its initial temperature—the control cell generated 3.05 watt-hours, while
the 60-degree-Celsius cell generated only 1.7 watt-hours.

“In the past, it was universally believed that lithium ion batteries should
avoid operating at high temperatures due to the concern of accelerated side
reactions,” says Wang. “This study suggests that the benefits of mitigated
lithium plating at the elevated temperature with limited exposure time far
outweigh the negative impact associated with exacerbated side reactions.”

The researchers note that the technology is completely scalable because all
the cells are based on industrially available electrodes; and they have
already demonstrated its use in large-scale cells, modules, and battery
packs. The nickel foil increases the cost of each cell by 0.47%, but because
the design eliminates the need for the external heaters used in current
models, it actually lowers the cost of producing each pack.

Next, Wang’s team is planning to take their design a step further.

“We are working to charge an energy-dense electric vehicle battery in five
minutes without damaging it,” he says. “This will require highly stable
electrolytes and active materials in addition to the self-heating structure
we have invented.”

Publication: Joule
Asymmetric Temperature Modulation for Extreme Fast Charging of Lithium-Ion
Batteries
https://www.cell.com/joule/fulltext/S2542-4351(19)30481-7

Source: Penn State University
In and out with 10-minute electrical vehicle recharge
https://news.psu.edu/story/594641/2019/10/30/research/and-out-10-minute-electrical-vehicle-recharge
[© revolution-green.com]


+ (Texas Austinites want EVs)
https://www.austinchronicle.com/news/2019-11-01/austins-steady-strides-toward-climate-sustainability/
Austin’s Steady Strides Toward Climate Sustainability
Nov. 1, 2019 ... EVs will be widely available more quickly than people
realize ... projections are that electric cars can become competitive with
gasoline power as early as 2022 or 2023. If that happens, combined with a
state energy grid that is increasingly "green and getting greener," ... more
Texans (certainly more Austinites) will begin to adopt electric vehicles for
both environmental and practical reasons. "When cheaper alternatives and
more pleasant alternatives are presented to most Americans, they'll adopt
those alternatives. Many younger people don't want to own a car, if that's
possible, and don't want to live in suburbia. ... (if you don't act like
adualts, we will)
https://www.austinchronicle.com/binary/3b1f/pols_feature1-1.jpg




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