Abstract A V2O5 anode material significantly challenged on its further development to be used in lithium ion batteries in-terms of its structural degradation, poor cyclability and low conductivity. Thus researchers started to work on composite matrix such as V2O5–P2O5 and in this work we synthesized pristine and 7.5% GNP modified 75V2O5–25P2O5 and used for the first time as anode for lithium-ion batteries; the anodes delivered with corresponding first discharge capacities of ∼1400 and ∼1600 mA h g−1 (almost equal to theoretical capacity of V2O5 1472 mA h g−1 during a fully reduction from V5+ to V0), respectively. The rapid capacity fade was observed in the first few initial cycles (up to 10th cycle) for both materials; however highest discharge capacity of 446 mAh g−1 was retained after 100th cycles for 7.5% GNP modified 75V2O5–25P2O5 than unmodified composite, with the capacity retention of 89% with respect to 10th cycle discharge capacity. The electrical conductivity of 75V2O5–25P2O5 drastically increases with GNP modification. The superior electrochemical performance of 75V2O5–25P2O5–7.5%GNP attributed to the high electronic and ionic conductivity of graphene nano-platelets.

中文翻译：

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石墨烯纳米片改性75V 2 O 5 –25P 2 O 5 玻璃作为锂离子电池负极材料的电学和电化学性能

摘要 V2O5 负极材料的结构退化、循环性能差和电导率低，对其进一步开发用于锂离子电池提出了重大挑战。因此，研究人员开始研究复合基体，如 V2O5–P2O5，在这项工作中，我们合成了原始和 7.5% GNP 改性的 75V2O5–25P2O5，并首次用作锂离子电池的负极；阳极分别具有~1400 和~1600 mAh g-1 的相应首次放电容量（几乎等于 V2O5 从 V5+ 完全还原到 V0 时的理论容量 1472 mAh g-1）。两种材料在最初的几个初始循环（最多第 10 个循环）中都观察到了快速容量衰减；然而，最高放电容量 446 mAh g-1 在第 100 次循环后保持 7. 5% GNP 改性 75V2O5–25P2O5 比未改性复合材料，相对于第 10 次循环放电容量的容量保持率为 89%。75V2O5-25P2O5 的电导率随着 GNP 的改变而急剧增加。75V2O5–25P2O5–7.5%GNP 的优异电化学性能归因于石墨烯纳米片的高电子和离子电导率。