{"id":6347,"date":"2019-02-20T11:35:25","date_gmt":"2019-02-20T03:35:25","guid":{"rendered":"https:\/\/battery9999.com\/%e5%85%b7%e9%87%8d%e9%87%8f%e8%bc%95%e3%80%81%e8%83%bd%e9%87%8f%e5%af%86%e5%ba%a6%e9%ab%98%e5%84%aa%e5%8b%a2%ef%bc%8c%e9%8b%b0%e7%a9%ba%e6%b0%a3%e9%9b%bb%e6%b1%a0%e7%99%bc%e5%b1%95%e6%bd%9b%e5%8a%9b\/"},"modified":"2019-02-20T11:42:49","modified_gmt":"2019-02-20T03:42:49","slug":"%e5%85%b7%e9%87%8d%e9%87%8f%e8%bc%95%e3%80%81%e8%83%bd%e9%87%8f%e5%af%86%e5%ba%a6%e9%ab%98%e5%84%aa%e5%8b%a2%ef%bc%8c%e9%8b%b0%e7%a9%ba%e6%b0%a3%e9%9b%bb%e6%b1%a0%e7%99%bc%e5%b1%95%e6%bd%9b%e5%8a%9b","status":"publish","type":"post","link":"https:\/\/battery9999.com\/en\/%e5%85%b7%e9%87%8d%e9%87%8f%e8%bc%95%e3%80%81%e8%83%bd%e9%87%8f%e5%af%86%e5%ba%a6%e9%ab%98%e5%84%aa%e5%8b%a2%ef%bc%8c%e9%8b%b0%e7%a9%ba%e6%b0%a3%e9%9b%bb%e6%b1%a0%e7%99%bc%e5%b1%95%e6%bd%9b%e5%8a%9b\/","title":{"rendered":"Research into lithium-oxygen batteries could boost performance of electronics, cars"},"content":{"rendered":"

Tue, 01\/29\/2019<\/span><\/span><\/p>\n

\"\"<\/span><\/p>\n

\u00a0source: University of Kansas<\/span><\/span><\/div>\n

<\/p>\n

LAWRENCE \u2014 Sick of having to plug in your phone every night? Help might be on the way.<\/p>\n

New research at the University of Kansas could provide longer-lasting batteries for most consumer electronics and electronic vehicles in the coming years.<\/p>\n

Today, most Americans own electronic devices powered by rechargeable lithium-ion batteries and some drive cars powered by lithium-ion battery technology. But lithium-ion batteries have drawbacks, like the need for regular recharging.<\/p>\n

\"\"<\/p>\n

\u201cEveryone wants to have better batteries for phones, electronics and cars,\u201d said Xianglin Li, assistant professor of mechanical engineering. \u201cThe current lithium-ion battery, which is used everywhere, doesn\u2019t have enough energy density \u2014 you have to charge your phone every day.\u201d<\/p>\n

Recently, Li earned a new $219,312, two-year grant from the National Science Foundation<\/a>2<\/sup> to push forward cutting-edge lithium-oxygen batteries. He said that lithium-oxygen batteries represent the most promising battery platform to take the place of lithium-ion.<\/p>\n

\u201cThe research we\u2019re doing on the lithium-oxygen battery represents the next generation of energy storage,\u201d he said. \u201cTheoretically, it has about one order of magnitude higher storage capacity than lithium-ion. So, if you switch to this in the future, you\u2019ll only need to charge your phone once a week. There are competing technologies like the zinc-air or lithium-sulfur batteries, but lithium-oxygen clearly is the one with the highest capacity, so it has great advantage.\u201d<\/p>\n

While lithium-oxygen batteries promise much greater energy storage capacity, their shortcoming is an inability to discharge energy as fast as lithium-ion batteries. Until this drawback is overcome, lithium-oxygen battery technology will remain in the lab research stage, according to the KU investigator.<\/p>\n

\"\"<\/p>\n

\u201cThe problem is lithium-oxygen has low current density \u2014 it lasts a long time, but you don\u2019t get a lot of power,\u201d Li said. \u201cIf you use lithium-oxygen batteries for an electric car, you could drive 500 miles, but you can\u2019t accelerate very fast. Driving just a few miles per hour isn\u2019t very fun. As far as I know, almost all lithium-oxygen batteries are still in the research phase and the technology doesn\u2019t have a very large market yet. Performance, stability and lifetime are all issues for lithium-oxygen batteries now. But in the ’70s and ’80s, lithium-ion batteries had similar issues.\u201d<\/p>\n

With his new NSF grant, Li hopes to develop technology to boost the current density of lithium-oxygen batteries to make them more practical. He\u2019ll work in the X-ray Computed Tomography Facility at Carnegie Mellon University, collaborating with Shawn Lister.<\/p>\n

\u201cOur objective is to increase the power of lithium-oxygen battery by one order of magnitude while having the state-of-the-art energy density,\u201d Li said.<\/p>\n

Li and Lister will focus on understanding and improving the function of the oxygen electrode of the lithium-oxygen battery. Li said lithium-oxygen batteries must absorb oxygen from the air through nanoscale pores to facilitate reactions. So, the electrochemical performance of lithium-oxygen batteries depends on the liquid-gas two-phase flow at the pore scale of the electrode. The researchers aim to better understand the pore-scale transport of the battery electrodes as governed by pore size, structure, connectivity and wettability.<\/p>\n

\"\"<\/p>\n

\u201cShawn Lister at Carnegie Mellon has a unique device to measure morphologies at the nanoscale \u2014 technology that\u2019s like a CT scan in a hospital, but with very high resolution down to the 20-30 nanometer resolution,\u201d Li said. \u201cWe want to measure the lithium-oxygen battery electrodes and understand how we can transfer oxygen better with an improved design.\u00a0 The battery has to absorb oxygen from the air, so if we don\u2019t supply oxygen fast enough, the power will be limited. We\u2019re going to use his facility along with our advanced models and theories to try to design a high-performing battery electrode \u2014 and hopefully we\u2019ll have a prototype for lab demonstration.\u201d<\/p>\n

The investigation will focus on improving oxygen\u2019s sluggish mass transfer in battery electrodes.<\/p>\n

\u201cBatteries are electrochemical devices where you want a high reaction rate \u2014 and the only place the reaction can happen is in the electrode and electrolyte interface,\u201d Li said. \u201cWe have to create as high a surface area as possible using nanomaterials, but mass transfer will be very slow because nanopores have higher resistance. In a lithium-oxygen battery, the electrolyte is liquid and the mass transfer through liquid is very slow compared with air. One example is you can\u2019t breathe through a piece of paper soaked with water because of the high water resistance to oxygen transfer. It\u2019s the same case for a liquid electrolyte, so we want to create the gas phase in our electrode to facilitate the oxygen transfer.\u201d<\/p>\n

Li said the project has the potential to result in a patented technology that could push forward research and adoption of the lithium-oxygen technology in the coming years. The researchers plan to form potential partnerships with the local industry and reach out to the public through the Kansas City STEM Alliance<\/a>3<\/sup>.<\/p>\n

Additionally, the grant work will support the training of two KU graduate students.<\/p>\n

\u201cI currently have a Ph.D. student who I think will join with me in the summer to come to CMU,\u201d Li said. \u201cIt\u2019s a great training experience. He\u2019ll graduate later this year and next year there will be another graduate student \u2014 so I\u2019ll train two different students during this project.\u201d<\/p>\n

Top image:<\/strong> Battery design will focus on the oxygen electrode (~1.2 cm diameter and 0.4 mm thickness). Credit: Xianglin Li<\/p>\n

Top right image:<\/strong> Researchers will obtain 3-D nanotomography of the electrode. The 3-D nanostructure will enable further simulations of mass transfer coupled with electrochemical reactions and improvement of electrode designs. This image represents simulated oxygen distribution within the electrode. Red means higher concentration, and black means lower concentration. Credit: Xianglin Li<\/p>\n

Bottom right image:<\/strong> Nanotomography of battery electrode collected from Argonne National Lab. Different colors represent different materials. Credit: Xianglin Li.<\/p>\n

\n

The University of Kansas is a major comprehensive research and teaching university. The university’s mission is to lift students and society by educating leaders, building healthy communities and making discoveries that change the world. The KU News Service is the central public relations office for the Lawrence campus.<\/p>\n<\/div>\n

Source:Research into lithium-oxygen batteries could boost performance of electronics, cars<\/a><\/span><\/span><\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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