{"id":465,"date":"2018-09-17T08:55:10","date_gmt":"2018-09-17T08:55:10","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=465"},"modified":"2018-09-17T08:55:10","modified_gmt":"2018-09-17T08:55:10","slug":"tenfold-improvement-in-liquid-batteries-mean-electric-car-refuelling-could-take-minutes","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/465\/tenfold-improvement-in-liquid-batteries-mean-electric-car-refuelling-could-take-minutes\/","title":{"rendered":"Tenfold improvement in liquid batteries mean electric car refuelling could take minutes"},"content":{"rendered":"<div class=\"field field-name-field-header field-type-text-long field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p class=\"selectionShareable\"><strong>One of the biggest drawbacks of electric vehicles \u2013\u00a0that they require hours and hours to charge \u2013\u00a0could be obliterated by new type of liquid battery that is roughly ten times more energy-dense than existing models, according to Professor Lee Cronin, the Regius Chair of Chemistry at the University of Glasgow, UK.<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"field field-name-body field-type-text-with-summary field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p class=\"selectionShareable\"><strong>What\u2019s so special about this liquid, or flow, battery?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018A normal electric vehicle has a solid battery, and when that runs out of charge you have to recharge it by plugging it in to a power socket. This takes half an hour or so if you find a rapid charger at a motorway service station, or up to 12 hours at home. Our battery, however, is made of a liquid rather than a solid. If you run out of charge, you could in principle pump out the depleted liquid and \u2013\u00a0like a regular petrol or diesel vehicle \u2013\u00a0refill it with liquid that is ready-charged. And that would take minutes.\u2019<\/p>\n<p class=\"selectionShareable\"><strong>How does it work?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018The part of a battery containing the charge is known as the electrolyte and when this is made of a solid it is sandwiched between two electrodes. When you use the battery, a chemical reaction takes place inside the electrolyte, and charge passes from one electrode to the other until the electrolyte is depleted. Then you charge the battery up, by forcing charge in the opposite direction through the electrodes, until the system is recharged.<\/p>\n<p class=\"selectionShareable\">\u2018A flow battery is different. Here, because the electrolyte is made of a liquid, it can be stored in a tank, and pumped past the electrodes during operation. Because you\u2019ve got a lot more electrolyte to draw on, a flow battery can produce a lot of power \u2013\u00a0you get more bang for your buck.\u2019<\/p>\n<div class=\"dynamic_article_image_bloc\"><img decoding=\"async\" src=\"https:\/\/horizon-media.s3-eu-west-1.amazonaws.com\/s3fs-public\/IMCEUpload\/LeeCronin-crop.jpg\" alt=\"Big companies from around the world have already shown interest in Prof. Lee Cronin's energy-dense liquid battery. Image credit - University of Glasgow\" \/><\/p>\n<p class=\"caption credit\">Big companies from around the world have already shown interest in Prof. Lee Cronin&#8217;s energy-dense liquid battery. Image credit &#8211; University of Glasgow<\/p>\n<\/div>\n<p class=\"selectionShareable\"><strong>So it\u2019s still the same chemical reaction making the electricity, but it\u2019s taking place in a continuous flow of liquid rather than a solid?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018Exactly. Also, because the electrolyte is a simple inorganic salt in water, it is possible to control the ageing. Inside a normal, lithium battery, the solid system degrades over time so that the charge struggles to move back and forth. That\u2019s the reason lithium batteries only last for a certain number of charge-discharge cycles. In our inorganic liquid battery, however, this ageing process doesn\u2019t occur in the same way, because the inorganic salt is very stable.\u2019<\/p>\n<p class=\"selectionShareable\"><strong>Why has no one thought of using flow batteries in electric cars before?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018Flow batteries have been around a long time, but their main problem has been a poor energy density. In other words, although you could produce a lot of power, you needed a very big tank of electrolyte to deliver it \u2013\u00a0far too big for mobile applications.<\/p>\n<p class=\"selectionShareable\">\u2018As a chemist, I have been interested in how we can get more electrons \u2013\u00a0more charge \u2013\u00a0into a volume of space. This year, my colleagues and I\u00a0<a href=\"https:\/\/www.nature.com\/articles\/s41557-018-0109-5\" target=\"_blank\" rel=\"noopener noreferrer\">discovered<\/a>\u00a0that if we made an electrolyte out of a very high concentration of a metal oxide, it was able to absorb much more charge than we expected. The result was a flow battery with roughly ten times more energy density than had previously been achieved \u2013\u00a0225 watt-hours per litre, with the possibility of up to 1,000 watt-hours per litre. I suddenly realised that with this energy density, application to vehicles could be possible.\u2019<\/p>\n<div class=\"quote-view quotesBlock quote_horizontal\">\n<blockquote><p>\u2018A flow battery can produce a lot of power &#8211; you get more bang for your buck .&#8217;<br \/>\n&#8211; Professor Lee Cronin, University of Glasgow, UK.<\/p><\/blockquote>\n<\/div>\n<p class=\"selectionShareable\"><strong>How does the performance compare with the current batteries inside electric vehicles?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018A Tesla Model 3, for example, has a 70 kilowatt-hour battery. To have the same capacity as that, we would need at least 70 litres of the best version of our battery \u2013\u00a0that\u2019s around the same size as the fuel tank in a petrol car.\u2019<\/p>\n<p class=\"selectionShareable\"><strong>How hard would this be to implement in practice?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018There is no reason why a flow battery could not be retrofitted into an existing electric vehicle, provided it generates the same output and takes up the same space. Meanwhile, all the petrol stations in the world have pumps, and are used to handling liquids, so a lot of the infrastructure is already there. The liquids we\u2019re using are corrosive, but it is possible to consider retrofitting piping to cope with this. Perhaps the storage tanks would have to be upgraded, but upgrading something is a lot cheaper than building entirely new infrastructure. The major benefit is that our electrolytes are green \u2013\u00a0the depleted ones can be recharged, hopefully using renewable electricity, and given to the next customer.\u2019<\/p>\n<p class=\"selectionShareable\"><strong>What\u2019s stopping us from doing this right now?<\/strong><\/p>\n<p class=\"selectionShareable\">\u2018There\u2019s a lot of engineering to be done, to make sure that it can work safely and reliably. Currently, we\u2019re transferring our knowledge from the laboratory to a test rig, and developing a prototype. We want to check that we\u2019re getting the energy densities we expect, and that the mechanics of the pumping works. If I had all the money, I could imagine three steps: build a prototype to validate all the workings and optimise efficiency, build another for use in a stationary application, and finally bung it in a car.<\/p>\n<p class=\"selectionShareable\">\u2018I\u2019m hoping that other people will now adopt this idea, and treat it seriously because of the increased energy density. Big companies from around the world have already got in contact, and I\u2019ve just got to work out the best course of action. I\u2019m a university professor, so my job is to understand how the universe works, but I\u2019m not afraid to do some engineering if there\u2019s the potential to solve a massive problem, if the funding for the vision was available.\u2019<\/p>\n<p class=\"selectionShareable\"><em>The research in this article was funded by the EU&#8217;s European Research Council. If you liked this article, please consider sharing it on social media.<\/em><\/p>\n<p>Originally published at <a href=\"https:\/\/horizon-magazine.eu\/article\/tenfold-improvement-liquid-batteries-mean-electric-car-refuelling-could-take-minutes_en.html\">Horizon<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>One of the biggest drawbacks of electric vehicles \u2013\u00a0that they require hours and hours to charge \u2013\u00a0could be obliterated by new type of liquid battery that is roughly ten times more energy-dense than existing models, according to Professor Lee Cronin, the Regius Chair of Chemistry at the University of Glasgow, UK. What\u2019s so special about &#8230; <a title=\"Tenfold improvement in liquid batteries mean electric car refuelling could take minutes\" class=\"read-more\" href=\"https:\/\/scienceblog.com\/horizon\/465\/tenfold-improvement-in-liquid-batteries-mean-electric-car-refuelling-could-take-minutes\/\" aria-label=\"Read more about Tenfold improvement in liquid batteries mean electric car refuelling could take minutes\">Read more<\/a><\/p>\n","protected":false},"author":298,"featured_media":466,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[16],"tags":[201,200,199],"class_list":["post-465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology","tag-batteries","tag-cars","tag-eletric"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Tenfold improvement in liquid batteries mean electric car refuelling could take minutes - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/465\/tenfold-improvement-in-liquid-batteries-mean-electric-car-refuelling-could-take-minutes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tenfold improvement in liquid batteries mean electric car refuelling could take minutes\" \/>\n<meta property=\"og:description\" content=\"One of the biggest drawbacks of electric vehicles \u2013\u00a0that they require hours and hours to charge \u2013\u00a0could be obliterated by new type of liquid battery that is roughly ten times more energy-dense than existing models, according to Professor Lee Cronin, the Regius Chair of Chemistry at the University of Glasgow, UK. 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