{"id":3286,"date":"2016-03-04T07:51:09","date_gmt":"2016-03-03T23:51:09","guid":{"rendered":"http:\/\/people.utm.my\/haslinasarkan\/?p=3286"},"modified":"2016-03-04T07:51:09","modified_gmt":"2016-03-03T23:51:09","slug":"an-electric-car-battery-that-will-get-you-from-paris-to-brussels-and-back","status":"publish","type":"post","link":"https:\/\/people.utm.my\/haslinasarkan\/an-electric-car-battery-that-will-get-you-from-paris-to-brussels-and-back\/","title":{"rendered":"An Electric Car Battery That Will Get You From Paris to Brussels and Back"},"content":{"rendered":"<p>This article is taken from\u00a0<a href=\"http:\/\/spectrum.ieee.org\/transportation\/advanced-cars\/an-electric-car-battery-that-will-get-you-from-paris-to-brussels-and-back?utm_source=Boomtrain&amp;utm_medium=manual&amp;utm_campaign=Tech_Alert_030316&amp;bt_email=haslinams@utm.my&amp;bt_ts=1457014987237\" target=\"_blank\">here.<\/a><\/p>\n<h2>The metal-air battery carries more energy per kilogram than today\u2019s lithium-ion batteries<\/h2>\n<p>By Winfried W. Wilcke &amp; Ho-Cheol Kim<\/p>\n<div>Posted <label>26 Feb 2016 | 17:00 GMT<\/label><\/div>\n<div><\/div>\n<div>\n<p><strong>Proposition: Electric cars will remain<\/strong> mostly niche products until they have a range of 800 kilometers, or roughly 500 miles, with an affordable battery.<\/p>\n<p>That\u2019s as far as most people would want to drive in a day, and then they have all night to recharge.<\/p>\n<p>That\u2019s how we came up with a figure of 800 km\u2014or a nice round 500 miles\u2014as the goal for our R&amp;D project, Battery 500. It began in 2009 at the IBM Almaden Research Center, in San Jose, Calif., and has grown since then into a multinational partnership with commercial and academic participants in Europe, Asia, and the United States. It is based on metal-air technology, which packs far more energy into a battery of a given mass than today\u2019s state-of-the-art technology, the lithium-ion battery. We are still years away from commercialization, but we have made enough progress to predict that these batteries could be used in cars in the foreseeable future. Why are we so confident? Read on.<\/p>\n<p><strong>Electric motors are ideally<\/strong> suited for powering cars. They\u2019re lightweight and extremely powerful, they achieve efficiencies in excess of 90 percent, they don\u2019t need complex transmissions, and they churn out torque in just the right way, providing full rotational force starting with zero rpms. Internal-combustion engines, by contrast, don\u2019t produce high torque until they\u2019re spinning at thousands of rpms.<\/p>\n<p>But even though they\u2019re propelled by a near-ideal mechanism, electric cars have a huge drawback, which is the low energy content of the batteries. Gasoline packs about 13,000 watt-hours per kilogram; the best production lithium-ion cells store only about 250 Wh\/kg. Add the mass of the ancillary battery equipment\u2014including the bus bars, cooling system, and battery management system\u2014and the energy density of the entire system drops by half, giving the batteries a pitiful 1 percent of the raw energy density of gasoline.<\/p>\n<p>This huge gap between the energy densities of gasoline and batteries seemed to make it impossible to build competitive electric cars, but the success of theTesla Model S has shown that it can be done. One major factor in favor of the electric car is the high efficiency with which it converts battery power to motive power at the wheels\u2014about six times as efficiently as the average for gasoline-fueled cars in the United States. Also, electric car makers put the biggest, heaviest battery they can reasonably fit into their designs. Even so, the ranges fall far short of the 500-mile target. The upshot is that electric-car batteries need to attain at least twice the energy density of Li-ion cells to achieve a range of 800 km.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This article is taken from\u00a0here. The metal-air battery carries more energy per kilogram than today\u2019s lithium-ion batteries By Winfried W. Wilcke &amp; Ho-Cheol Kim Posted 26 Feb 2016 | 17:00 GMT Proposition: Electric cars will remain mostly niche products until they have a range of 800 kilometers, or roughly 500 miles, with an affordable battery. [&hellip;]<\/p>\n","protected":false},"author":6477,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-3286","post","type-post","status-publish","format-standard","hentry","category-research-blog"],"_links":{"self":[{"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/posts\/3286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/users\/6477"}],"replies":[{"embeddable":true,"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/comments?post=3286"}],"version-history":[{"count":0,"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/posts\/3286\/revisions"}],"wp:attachment":[{"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/media?parent=3286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/categories?post=3286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/people.utm.my\/haslinasarkan\/wp-json\/wp\/v2\/tags?post=3286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}