当前位置: X-MOL 学术ChemElectroChem › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
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
Affiliation  

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 42 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
down
wechat
bug