A vanadium formate (VF) coordination polymer and its composite with partially reduced graphene oxide (prGO), namely VF‐prGO, can be applied as anode materials for Li‐ion based electrochemical energy storage (EcES) systems in the potential range of 0–3 V (vs Li⁺/Li). This study shows that a reversible capacity of 329 mAh g⁻¹ at a current density of 50 mA g⁻¹ after 50 cycles can be realized for VF along with a high rate capability. The composite exhibits even a higher capacity of 504 mAh g⁻¹ at 50 mA g⁻¹. A good capacity retention is observed even after 140 cycles for both VF and the composite. An ex‐situ X‐ray photoelectron spectroscopy study indicates the involvement of V³⁺/V⁴⁺ redox couple in the charge storage mechanism. A significant contribution of this reversible capacity is attributed to the pseudocapacitive behavior of the system.

中文翻译：

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层状钒甲酸酯配位聚合物中基于锂离子的电化学能量存储。

甲酸钒（VF）配位聚合物及其与部分还原的氧化石墨烯（prGO）形成的复合材料，即VF-prGO，可用作电位范围为0-的锂离子基电化学储能（EcES）系统的阳极材料。 3 V（vs Li ⁺ / Li）。该研究表明，对于VF，具有高倍率能力，在50个循环后，电流密度为50 mA g ^-1时可逆容量为329 mAh g ^-1。该复合物在50mA g ^-1时甚至表现出更高的504 mAh g ^-1的容量。对于VF和复合材料，即使在140次循环后仍观察到良好的容量保持率。电子X原位X射线光电子能谱法的研究表明V的参与³⁺ / V ⁴⁺氧化还原耦合在电荷存储机制中。这种可逆容量的重要贡献归因于系统的伪电容行为。