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Three-dimensional-network Li3V2(PO4) 3/C composite as high rate lithium ion battery cathode material and its compatibility with ionic liquid electrolytes

机译:三维网络Li3V2(PO4)3 / C复合材料作为高倍率锂离子电池正极材料及其与离子液体电解质的相容性

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摘要

A high performance Li3V2(PO4)3 cathode material for lithium ion batteries was synthesized by the microwave-assisted hydrothermal method followed by a post annealing process. The synchrotron X-ray diffraction analysis results confirmed that single-phase Li3V2(PO4)3 with monoclinic structure was obtained. Scanning electron microscope and transmission electron microscope images revealed that the as-prepared Li3V 2(PO4)3 was composed of nanowires and microsized particles. Electrochemical results demonstrated that the Li 3V2(PO4)3 electrode measured at 10 C after 500 cycles can deliver discharge capacities of 85.4 mAh g-1 and 103.4 mAh g-1, with a capacity retention of 99.3% and 95.9%, in the voltage ranges of 3.0-4.3 V and 3.0-4.8 V, respectively, indicating good cycling stability. Furthermore, the electrochemical performance of Li 3V2(PO4)3 in ionic liquid electrolytes between 3.0 V and 4.8 V was also measured.
机译:通过微波辅助水热法,后退火工艺合成了锂离子电池高性能Li3V2(PO4)3正极材料。同步加速器X射线衍射分析结果证实,获得了具有单斜晶结构的单相Li3V2(PO4)3。扫描电子显微镜和透射电子显微镜图像显示,所制备的Li3V 2(PO4)3由纳米线和超细颗粒组成。电化学结果表明,Li 3V2(PO4)3电极在500循环后于10 C下测量,可提供85.4 mAh g-1和103.4 mAh g-1的放电容量,电压下的容量保持率分别为99.3%和95.9%范围分别为3.0-4.3 V和3.0-4.8 V,表明良好的循环稳定性。此外,还测量了Li 3V2(PO4)3在3.0 V至4.8 V之间的离子液体电解质中的电化学性能。

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