Mechanism investigation of high performance Na3V2(PO4)2O2F/reduced graphene oxide cathode for sodium-ion batteries
Mechanism investigation of high performance Na3V2(PO4)2O2F/reduced graphene oxide cathode for sodium-ion batteries
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高性能Na3V2(PO4)2O2F/还原氧化石墨烯钠离子电池正极机理研究
DOI：
10.1016/j.jpowsour.2020.228906
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发表时间：
2021-01
影响因子：
9.2
通讯作者：
Wang Ye
中科院分区：
文献类型：
--
作者：
Ma Caiyun;Xu Tingting;Yan Congcong;Xu Junmin;Kong Dezhi;Zhang Zhuangfei;Shen Weixia;Shi Yumeng;Ke Chang;Li Xinjian;Wang Ye
Na3V2(PO4)2O2F(NVPOF)具有工作平台高、体积变化小、理论容量大等优点，是一种很有前途的钠离子电池正极材料。然而，其固有的劣化动力学特性严重阻碍了其电化学性能的提高。其中，NVPOF纳米棒通过简单的静电组装和热处理处理均匀地固定在还原石墨烯氧化物(RGO)纳米片上。将合成的NVPOF@rGO纳米复合材料作为SIBs的正极材料。在RGO的辅助下，NVPOF@rGO改善了表面动力学，降低了极化，从而提高了倍率能力和长周期稳定性。原位X射线衍射结果表明，NVPOF@rGO的脱色过程与两个Na/两个电子的全抽提过程有关，晶相由Na3V2(PO4)2O2F转变为Na2V2(PO4)2O2F(第一电荷平台)，再转变为NaV2(PO4)2O2F(第二电荷平台)，而盐化过程则相反。在NVPOF@rGO纳米复合材料中加入RGO纳米片后，钠离子的扩散系数大大增加。这种优异的电化学性能归因于RGO纳米片和NVPOF纳米棒之间通过提高电子传导性和改善电化学动力学而产生的协同效应。我们的研究结果为改善SIBs正极材料的电化学性能提供了一条简单的途径。
Na3V2(PO4)2O2F (NVPOF) is a promising cathode material for sodium-ion batteries (SIBs) due to its high working plateaus, small volume change and large theoretical capacity. However, the electrochemical performance is strongly hampered by its intrinsic inferior kinetics. Herein, NVPOF nanorods are uniformly anchored onto reduced-graphene oxide (rGO) nanosheets by a simple electrostatic assembly method followed by thermal-annealing treatment. The synthesized NVPOF@rGO nanocomposite is applied as cathode material of SIBs. With the assistance of rGO, NVPOF@rGO has improved surface kinetics and reduced polarization, leading to an enhanced rate capability and long cycle stability. The in-situ XRD results indicate that the desodiation process of NVPOF@rGO is related to two-Na/two electrons full extraction process and the crystal phase is changed from Na3V2(PO4)2O2F into Na2V2(PO4)2O2F (1st charge plateau) and then to NaV2(PO4)2O2F (2nd charge plateau), and the sodiation process is the reverse process. The diffusion coefficient of sodium ions is increased greatly with the assistance of rGO nanosheets for NVPOF@rGO nanocomposites. This superior electrochemical performance is attributed to the synergetic effect between rGO nanosheets and the NVPOF nanorod by enhanced electronic conductivity and the improved electrochemical kinetics. Our results may provide a simple route to improve the electrochemical performance for the cathode materials of SIBs.
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