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Three‐Dimensional Graphene Network Decorated with Highly Symmetrical Cuboid Na3V2(PO4)2F3 Particles: High Rate Capability and Cycling Stability for Sodium‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-01-11 , DOI: 10.1002/celc.202001514 Shuyuan Xu 1 , Huijun Li 1 , Xiaomin Wang 2
ChemElectroChem ( IF 3.5 ) Pub Date : 2021-01-11 , DOI: 10.1002/celc.202001514 Shuyuan Xu 1 , Huijun Li 1 , Xiaomin Wang 2
Affiliation
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Na3V2(PO4)2F3 (NVPF) has captured significant heed for cathode materials of sodium‐ion battery (SIB), owing to its stable three‐dimensional (3D) structure channel that can accommodate Na+ diffusion. However, NVPF is still facing with a major challenge in terms of the electrochemical performance, owing to its uncontrollable morphology. Hence, it was fabricated by using a two‐step hydrothermal method, whereby NVPF cuboid particles of homogenous morphology and highly structural symmetry could anchor on the three‐dimensional graphene network (GN) structure to form NVPF@GN. The affiliation between the morphology and performance of the NVPF@GN was further probed by manipulating the morphology of the NVPF under diverse heat treatment temperatures. When the temperature reaches 480 °C, NVPF@GN manifests prolonged cyclability (the capacity fading rate of 0.01 % cycle−1 at 0.5 C during 300 cycles) and it shows outstanding rate performance (when the rate is reset to 0.5 C, the capacity is 107 mAh g−1 and capacity retention is 99 %), which can be ascribed to the high structural symmetry of NVPF@GN. These results indicate that NVPF@GN cuboids can be used as a prospective cathode material for SIBs.
中文翻译：
高度对称的长方体Na3V2（PO4）2F3颗粒修饰的三维石墨烯网络：钠离子电池的高倍率能力和循环稳定性
Na 3 V 2（PO 4）2 F 3（NVPF）由于钠离子电池（SIB）的稳定的三维（3D）结构通道可以容纳Na +，因此引起了钠离子电池（SIB）正极材料的广泛关注。扩散。然而，由于其不可控的形态，NVPF在电化学性能方面仍面临着重大挑战。因此，它是通过两步水热法制造的，具有均匀形态和高度结构对称性的NVPF长方体颗粒可以锚固在三维石墨烯网络（GN）结构上，形成NVPF @ GN。通过在不同的热处理温度下操纵NVPF的形态，进一步探究了NVPF @ GN的形态与性能之间的联系。当温度达到480°C时，NVPF @ GN表现出延长的可循环性（300个循环中0.5 C时0.01％循环-1的容量衰减率），并且显示出出色的速率性能（将速率重置为0.5 C时的容量）是107 mAh g-1，容量保持率为99％），这可归因于NVPF @ GN的高结构对称性。这些结果表明，NVPF @ GN长方体可用作SIB的预期阴极材料。
更新日期：2021-03-01
中文翻译：
高度对称的长方体Na3V2（PO4）2F3颗粒修饰的三维石墨烯网络：钠离子电池的高倍率能力和循环稳定性
Na 3 V 2（PO 4）2 F 3（NVPF）由于钠离子电池（SIB）的稳定的三维（3D）结构通道可以容纳Na +，因此引起了钠离子电池（SIB）正极材料的广泛关注。扩散。然而，由于其不可控的形态，NVPF在电化学性能方面仍面临着重大挑战。因此，它是通过两步水热法制造的，具有均匀形态和高度结构对称性的NVPF长方体颗粒可以锚固在三维石墨烯网络（GN）结构上，形成NVPF @ GN。通过在不同的热处理温度下操纵NVPF的形态，进一步探究了NVPF @ GN的形态与性能之间的联系。当温度达到480°C时，NVPF @ GN表现出延长的可循环性（300个循环中0.5 C时0.01％循环-1的容量衰减率），并且显示出出色的速率性能（将速率重置为0.5 C时的容量）是107 mAh g-1，容量保持率为99％），这可归因于NVPF @ GN的高结构对称性。这些结果表明，NVPF @ GN长方体可用作SIB的预期阴极材料。
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