[MCN] Wow! Low-cost, do-it-yourself solar storage battery
Lance Olsen
lance at wildrockies.org
Wed Nov 2 10:46:16 EDT 2016
Shoring up the power grid -- with DIY scrap-metal batteries
AMERICAN CHEMICAL SOCIETY PUBLIC RELEASE: 2-NOV-2016
With residential solar energy ramping up, consumers are looking for
ways to store extra energy without breaking the bank. To help solve
this problem, a team of scientists has come up with a novel
possibility: do-it-yourself, scrap-metal batteries. They report their
method in the journal ACS Energy Letters
<<http://pubs.acs.org/doi/abs/10.1021/acsenergylett.6b00295>>.
One of the most obvious choices these days for back-up energy storage
is the lithium-ion battery. This option, however, requires a complex,
global supply chain and high-end manufacturing facilities. But making
batteries hasn't always been so hi-tech. The world's first speculated
batteries originated during the first century B.C. with a terracotta
pot, a copper sheet and an iron rod, according to Cary L. Pint and
colleagues. Going back to this simple predecessor known as the
"Baghdad battery," the scientists decided to pursue a similarly basic
device using scrap steel and brass, which respectively make up the
most and the third-most abundant kinds of scrap metal waste in the
U.S.
Pint and his team developed a simple process that could be carried
out at home to prepare steel and brass scraps of varying sizes and
shapes, including shavings and screws, to turn them into effective
electrodes for batteries. When the electrodes were combined with
aqueous potassium hydroxide as the electrolyte, they yielded a
battery with a voltage of up to 1.8 volts and an energy density up to
20 watt hours per kilogram, which approaches that of traditional
lead-acid and nickel-iron batteries.
Testing showed the steel-brass batteries could charge and discharge
more than 5,000 times. Because such devices are made of common scrap
metal, they would be inexpensive and could help shift some of the
energy storage burden from a centralized model to a localized one,
the researchers say.
###
The authors acknowledge funding from NASA, the National Science
Foundation and Vanderbilt University.
The abstract that accompanies this study is available here.
http://pubs.acs.org/doi/abs/10.1021/acsenergylett.6b00295
--
=----------------------------------------------------------------===----------------------------------------------------------=
"The first commandment of economics is: Grow. Grow forever. Companies
get bigger. National economies need to swell by a certain percent
each year. People should want more, make more, earn more, spend more
-- ever more."
Donella Meadows. Just So Much And No More. Yes magazine June 30, 2001
http://www.yesmagazine.org/issues/reclaiming-the-commons/437
=----------------------------------===----------------------------------=
"If enterprises are to grow, they must increase the scale of their
production. Since production is useless without a market, the market
must grow if production expands. There are many ways one can expand
markets: the most efficient is to increase the buying power of the
mass of the population."
Mead, Walter Russell. Mortal Splendor: The American Empire in
Transition. 381 pages. Houghton Mifflin. 1987.
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