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首页> 外文期刊>Electrochimica Acta >Encapsulation of Lithium Vanadium Phosphate in Reduced Graphene Oxide for a Lithium-ion Battery Cathode with Stable Elevated Temperature Performance
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Encapsulation of Lithium Vanadium Phosphate in Reduced Graphene Oxide for a Lithium-ion Battery Cathode with Stable Elevated Temperature Performance

机译：用稳定的温度性能锂离子电池阴极在锂离子电池阴极中封装磷酸锂钒磷酸锂。

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AbstractPolyanion-type cathode materials have received considerable attention for lithium-ion battery applications because of their excellent thermal stability compared to oxide compounds. Although the incorporation of carbonaceous materials can augment the cycling performance, the role of carbon structures in lithium vanadium phosphate (Li3V2(PO4)3, LVP) compounds remains unclear at an elevated temperature. Herein, carbon-coated Li3V2(PO4)3(C-LVP) and reduced-graphene-oxide-wrapped Li3V2(PO4)3(rGO-LVP) samples are prepared, their electrochemical performance is examined at room temperature and an elevated temperature. The rGO-LVP and C-LVP samples exhibit discharge capacities of ～131mAhg？1and ～124mAhg？1, respectively, at charge and discharge rates of 10C in the range of 3.0–4.3V at 55°C after cycling at various rates. The capacity retentions of the rGO-LVP and C-LVP samples are ～95% and ～85%, respectively, after 150 cycles at charge and discharge rates of 1C in the range of 3.0–4.3V at 55°C. The excellent rate performance and cycling stability of the rGO-LVP sample are due to its capability in maintaining a low charge transfer resistance or a higher electrical conductivity and ionic conductivity as compared to the C-LVP sample during electrochemical cycling, as demonstrated by electrochemical impedance spectroscopy and cyclic voltammetry. The results have provided essential insight into designing inorganic–carbon hybrid materials for future batteries.]]>
机译：<！[cdata [ 抽象 Polyanion型阴极材料由于与氧化物化合物相比，它们的热稳定性优异地接受了锂离子电池应用的相当大。虽然含碳材料的掺入可以增强循环性能，但碳结构在磷酸锂钒（Li 3 V 2 （PO 4 ） 3 ，LVP）化合物仍然存在在升高的温度下不清楚。在此，碳涂层Li 3 V 2 （PO 4 ） 3 （C-LVP）和氧化石墨烯包裹的LI 3 V 2 （PO 4 ） 3 （RGO-LVP）样品制备，其电化学性能在室温下检查和升高的温度。 RGO-LVP和C-LVP样品表现出〜131MAHG的放电容量 1 和〜124mAhg ？1 ，在循环以55°C以55℃的电荷和放电速率分别为3.0-4.3V。 rgo-lVP和C-LVP样品的容量保持分别为95％〜85％，在150次循环后，在55℃下的3.0-4.3V的放电速率为3.0-4.3V。 RGO-LVP样品的优异速率和循环稳定性是由于电化学循环期间与C-LVP样品相比保持低电荷转移电阻或较高的电导率和离子电导率的能力，如电化学阻抗所证明的那样光谱学和循环伏安法。结果已经为设计未来电池设计无机 - 碳混合材料提供了基本的洞察。 ]]>

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