{"id":2767,"date":"2018-11-14T15:27:19","date_gmt":"2018-11-14T19:27:19","guid":{"rendered":"http:\/\/www.cire2n.upr.edu\/?p=2767"},"modified":"2018-11-14T15:27:19","modified_gmt":"2018-11-14T19:27:19","slug":"futuristic-batteries","status":"publish","type":"post","link":"https:\/\/cire2n.upr.edu\/?p=2767","title":{"rendered":"These fragile, futuristic batteries run longer with a little oil"},"content":{"rendered":"

Article by: Maria Temming<\/span><\/p>\n

www.sciencenews.org<\/span><\/p>\n

Batteries that use aluminum and oxygen normally live fast and die young. But a new design could help these high-energy devices endure.<\/span><\/p>\n

Aluminum-air batteries are promising candidates for a new generation of non-rechargeable batteries, because they\u2019re super lightweight and compact. The batteries, however, aren\u2019t widely used because their internal components quickly degrade each other. In the new aluminum-air setup, described in the Nov. 9\u00a0Science<\/em>,\u00a0oil acts as a buffer<\/a>\u00a0between the battery\u2019s corrosive components to greatly extend the device\u2019s shelf life. Such improved single-use batteries could provide backup power to electric cars or supply energy in remote, off-the-grid regions.<\/span><\/p>\n

\u201cThis is a very smart design,\u201d says Yiying Wu, a chemist at Ohio State University not involved in the work. The oil-buffer scheme might also improve\u00a0other types of metal-air batteries<\/a>\u00a0susceptible to self-corrosion, like zinc-air devices, he says (SN: 1\/21\/17, p. 22<\/em>).<\/span><\/p>\n

Each aluminum-air battery cell contains two electrodes, an aluminum anode and a cathode, separated by a liquid called an electrolyte. Oxygen molecules sucked from the air enter the cathode, where they react with electrons and aluminum particles that flow through the electrolyte from the anode, releasing energy to power electronics. Unfortunately, when the battery is on standby, the watery electrolyte eats away at the aluminum anode.<\/span><\/p>\n

 <\/p>\n

\u201cIt\u2019s essentially like a rusty tool,\u201d says study coauthor Brandon Hopkins, a mechanical engineer at the U.S. Naval Research Laboratory in Washington, D.C., who did the work at MIT. \u201cIf you put aluminum \u2014 or really any metal \u2014 in water, it will start to rust and corrode.\u201d As a result, aluminum-air batteries can lose about 80 percent of their stored charge just sitting on a shelf for a month.<\/p>\n

Hopkins and colleagues built a more durable aluminum-air device by inserting a polymer membrane between the cell\u2019s electrodes. When the battery is powering a device, electrolyte is pumped into the areas on both sides of the membrane from a reservoir. When the cell isn\u2019t in use, electrolyte is drained from the side of the membrane next to the aluminum anode, and oil flows in to replace it. This oil shields the aluminum from the electrolyte on the other side of the membrane. As soon as the battery is reactivated, the oil is pumped out and stored, and the electrolyte flows back in.<\/p>\n

In lab experiments, Hopkins\u2019 team used the new battery cell, as well as an aluminum-air cell without an oil buffer, for five-minute intervals with 24- or 72-hour breaks in between each interval. The electrolyte inside the conventional battery ate through the aluminum anode in just a couple of days, and the cell died. But the electrolyte inside the oil-equipped battery corroded the aluminum anode much more slowly, and the battery worked for a few weeks before the cell\u2019s energy was completely drained.<\/p>\n

The single cell prototype\u2019s energy output could possibly be increased either by making a larger version or by stacking multiple cells within a battery pack. \u201cResearchers still need to investigate the performance, cost and reliability of a full-scale battery pack,\u201d Wu says.<\/p>\n

In addition to serving as an emergency power source for electric vehicles, such lightweight cells could power long-range drones, Hopkins says. Aluminum-air batteries could also supply off-grid energy to military personnel and civilians in remote areas.<\/p>\n

https:\/\/www.sciencenews.org\/article\/these-fragile-futuristic-batteries-run-longer-little-oil<\/p>\n","protected":false},"excerpt":{"rendered":"

These fragile, futuristic batteries run longer with a little oil
\nA new design could help solve a problem that has long troubled aluminum-air power cells<\/p>\n","protected":false},"author":4,"featured_media":2769,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[53,35,52],"class_list":["post-2767","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-batteries","tag-education","tag-news"],"_links":{"self":[{"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/posts\/2767","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2767"}],"version-history":[{"count":1,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/posts\/2767\/revisions"}],"predecessor-version":[{"id":2770,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/posts\/2767\/revisions\/2770"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=\/wp\/v2\/media\/2769"}],"wp:attachment":[{"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2767"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2767"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cire2n.upr.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}