{"id":5621,"date":"2018-06-06T14:02:44","date_gmt":"2018-06-06T06:02:44","guid":{"rendered":"https:\/\/battery9999.com\/%e6%8f%90%e5%8d%87%e9%ab%98%e5%ae%b9%e9%87%8f%e9%8b%b0%e9%9b%a2%e5%ad%90%e9%9b%bb%e6%b1%a0%e7%a9%a9%e5%ae%9a%e6%80%a7%ef%bc%8c%e6%9c%89%e6%9c%9b%e5%b0%87%e6%89%8b%e6%a9%9f%e7%ba%8c%e8%88%aa%e6%8f%90\/"},"modified":"2018-06-08T13:50:33","modified_gmt":"2018-06-08T05:50:33","slug":"%e6%8f%90%e5%8d%87%e9%ab%98%e5%ae%b9%e9%87%8f%e9%8b%b0%e9%9b%a2%e5%ad%90%e9%9b%bb%e6%b1%a0%e7%a9%a9%e5%ae%9a%e6%80%a7%ef%bc%8c%e6%9c%89%e6%9c%9b%e5%b0%87%e6%89%8b%e6%a9%9f%e7%ba%8c%e8%88%aa%e6%8f%90","status":"publish","type":"post","link":"https:\/\/battery9999.com\/en\/%e6%8f%90%e5%8d%87%e9%ab%98%e5%ae%b9%e9%87%8f%e9%8b%b0%e9%9b%a2%e5%ad%90%e9%9b%bb%e6%b1%a0%e7%a9%a9%e5%ae%9a%e6%80%a7%ef%bc%8c%e6%9c%89%e6%9c%9b%e5%b0%87%e6%89%8b%e6%a9%9f%e7%ba%8c%e8%88%aa%e6%8f%90\/","title":{"rendered":"Northwestern researchers predict materials to stabilize record-high capacity lithium-ion battery"},"content":{"rendered":"
May 29, 2018 | By Amanda Morris<\/a><\/div>\n

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<\/span>First picture source: pixabay<\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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A schematic illustration of the battery’s cathode structure in which lithium is red, oxygen is green, manganese is purple, chromium is dark blue and vanadium is light blue.<\/p>\n

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EVANSTON – A Northwestern University research team has found ways to stabilize a new battery with a record-high charge capacity. Based on a lithium-manganese-oxide cathode, the breakthrough could enable smart phones and battery-powered automobiles to last more than twice as long between charges.<\/p>\n

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\u201cThis battery electrode has realized one of the highest-ever reported capacities for all transition-metal-oxide-based electrodes. It\u2019s more than double the capacity of materials currently in your cell phone or laptop,\u201d said Christopher Wolverton<\/a>, the Jerome B. Cohen Professor of Materials Science and Engineering in Northwestern\u2019s McCormick School of Engineering, who led the study. \u201cThis sort of high capacity would represent a large advancement to the goal of lithium-ion batteries for electric vehicles.\u201d<\/p>\n

The study was published online May 18 in Science Advances<\/a>.<\/p>\n

Lithium-ion batteries work by shuttling lithium ions back and forth between the anode and the cathode. The cathode is made from a compound that comprises lithium ions, a transition metal and oxygen. The transition metal, typically cobalt, effectively stores and releases electrical energy when lithium ions move from the anode to the cathode and back. The capacity of the cathode is then limited by the number of electrons in the transition metal that can participate in the reaction.<\/p>\n

A French research team first reported<\/a> the large-capacity lithium-manganese-oxide compound in 2016. By replacing the traditional cobalt with less expensive manganese, the team developed a cheaper electrode with more than double the capacity. But it was not without its challenges. The battery\u2019s performance degraded so significantly within the first two cycles that researchers did not consider it commercially viable. They also did not fully understand the chemical origin of the large capacity or the degradation.<\/p>\n

After composing a detailed, atom-by-atom picture of the cathode, Wolverton\u2019s team discovered the reason behind the material\u2019s high capacity: It forces oxygen to participate in the reaction process. By using oxygen \u2014 in addition to the transition metal \u2014 to store and release electrical energy, the battery has a higher capacity to store and use more lithium.<\/p>\n

Next, the Northwestern team turned its focus to stabilizing the battery in order to prevent its swift degradation.<\/p>\n

\u201cArmed with the knowledge of the charging process, we used high-throughput computations to scan through the periodic table to find new ways to alloy this compound with other elements that could enhance the battery\u2019s performance,\u201d said Zhenpeng Yao, co-first author of the paper and a former Ph.D. student in Wolverton\u2019s laboratory.<\/p>\n

The computations pinpointed two elements: chromium and vanadium. The team predicts that mixing either element with lithium-manganese-oxide will produce stable compounds that maintain the cathode\u2019s unprecedented high capacity. Next, Wolverton and his collaborators will experimentally test these theoretical compounds in the laboratory.<\/p>\n

This research was supported as a part of the Center for Electrochemical Energy Science<\/a>, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Science under award number DE-AC02-06CH11357. Yao, currently a postdoctoral researcher at Harvard University, and Soo Kim, a postdoctoral researcher at the Massachusetts Institute of Technology, are both former members of Wolverton\u2019s laboratory and served as the paper\u2019s co-first authors.<\/p>\n<\/div>\n