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首页> 外文期刊>RSC Advances >One-pot pyro synthesis of a nanosized-LiMn2O4/C cathode with enhanced lithium storage properties
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One-pot pyro synthesis of a nanosized-LiMn2O4/C cathode with enhanced lithium storage properties

机译：一锅热解法合成具有增强锂存储性能的纳米LiMn2O4 / C阴极

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A simple one-pot polyol-assisted pyro-technique has been adopted to synthesize highly crystalline, carbon-coated LiMn _(2) O _(4) (LMO/C) nanoparticles for use as a cathode material in rechargeable Li-ion battery (LIB) applications. The phase purity, structure and stoichiometry of the prepared cathode was confirmed using X-ray techniques that included high-resolution powder X-ray diffraction and X-ray absorption fine structure spectroscopy. Electron microscopy studies established that the synthetic technique facilitated the production of nano-sized LMO particles with uniform carbon coating. The prepared LMO/C cathode demonstrates excellent electrochemical properties (cycling stabilities of 86% and 77.5% and high rate capabilities of 79% and 36% within the potential windows of 3.3–4.3 V and 2.5–4.3 V, respectively). The high electrochemical performance of the LMO/C cathode is attributed to the nano-size of the LiMn _(2) O _(4) particles enabling high surface area and hence greater lithium insertion and also the uniform amorphous carbon coating facilitating effective reduction in manganese dissolution and volume expansion during the lithium de-intercalation/intercalation reactions. In addition, cyclic voltametry and impedance characterization confirm the reversible Li-intercalation and the role of the solid electrolyte interface layer (SEI) in the stable electrochemical reaction of the LMO/C electrode. Furthermore, this study shows the efficacy of a simple and low-cost pyro-synthetic method to realize high performance nano-sized particle electrodes with uniform carbon coating for useful energy storage applications.
机译：已采用一种简单的一锅多元醇辅助热解技术合成了高度结晶的，碳包覆的LiMn _（2）O _（4）（LMO / C）纳米粒子，用作可再充电锂离子电池的阴极材料（LIB）应用程序。使用包括高分辨率粉末X射线衍射和X射线吸收精细结构光谱学在内的X射线技术确认了所制备阴极的相纯度，结构和化学计量。电子显微镜研究证实，合成技术促进了具有均匀碳涂层的纳米级LMO颗粒的生产。制备的LMO / C阴极具有出色的电化学性能（在3.3-4.3 V和2.5-4.3 V的电势窗口内，循环稳定性分别为86％和77.5％，高倍率能力分别为79％和36％）。 LMO / C阴极的高电化学性能归因于LiMn _（2）O _（4）颗粒的纳米尺寸，能够实现高表面积，因此更大的锂插入量，以及均匀的无定形碳涂层，有助于有效还原锂脱嵌/插层反应中锰的溶解和体积膨胀。另外，循环伏安法和阻抗表征证实了可逆的锂嵌入以及固体电解质界面层（SEI）在LMO / C电极稳定的电化学反应中的作用。此外，这项研究显示了一种简单且低成本的热合成方法的功效，可实现具有均匀碳涂层的高性能纳米尺寸颗粒电极，用于有用的储能应用。

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