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华中师范大学余颖教授在Nano Letters上的锂硫电池大作——聚苯胺包裹含有硫嵌插的碳球
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华中师范大学余颖教授近年来致力于寻找一些新的方法来解决锂电领域的一些瓶颈问题，比如电极材料在充放电过程中的过度扩张和坍塌，在锂电领域取得了丰硕的成果。最近，余颖教授团队通过把聚苯胺修饰到包裹有硫的碳球上，得到了一种具有高效锂硫电池性能的电极材料。该功能材料可以有效的抑制充放电过程中电极的扩张和坍塌，从而实现2500次的充放电。随后作者惊奇的发现，仅用三块串联的电池，竟然可以在充电短短几分钟之后便可驱动2.8W的LED灯。此研究为我们提供了一种解决锂电瓶颈问题的新方法，所制备的电极材料具有较大的商业应用前景。 期刊： Nano Lett., Article ASAP DOI: 10.1021/acs.nanolett.5b01294 Publication Date (Web): July 22, 2015 题目： In Situ Polymerized PAN-Assisted S/C Nanosphere with Enhanced High-Power Performance as Cathode for Lithium/Sulfur Batteries 作者： Hao Hu , Haoyan Cheng , Zhengfei Liu , Guojian Li , Qianchen Zhu , and Ying Yu * 摘要： Carbonaceous and polymer materials are extensively employed as conductor and container to encapsulate sulfur particles and limit polysulfide dissolution. Even so, high-power performance is still far from satisfaction due to the expansion and collapse of the electrode materials during thousands of charge–discharge process. Herein, it is found that colloidal carbon sphere with high elastic coefficient can be utilized as a framework to load sulfur, which can trap soluble polysulfides species in the pores within the sphere and efficaciously improve the electronic conductivity of the cathode. After modified by polyaniline (PAN) through in situ polymerization, PAN-assisted S/C nanosphere (PSCs-73, with 73 wt % sulfur) effectively minimize polysulfide diffusion, enhance the electron transfer rate and overcome the problem of volume expansion. The fabricated PSCs-73 cell shows outstanding long high-power cycling capability over 2500 charge/discharge cycles with a capacity decay of 0.01% per cycle at 5 C. Substantially, this composite can drive 2.28 W white indicators of LED robustly after minutes of charging by three lithium batteries in series, showing a promising potential application in the future.  1.jpg  2.jpg  3.jpg  4.jpg |
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2015-07-25 09:36:18, 6.67 M
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