Dually Decorated Na3V2(PO4)2F3 by Carbon and 3D Graphene as Cathode Material for Sodium‐Ion Batteries with High Energy and Power Densities,ChemElectroChem

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Dually Decorated Na3V2(PO4)2F3 by Carbon and 3D Graphene as Cathode Material for Sodium‐Ion Batteries with High Energy and Power Densities
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-08-06 , DOI: 10.1002/celc.202000881
Lizhen Hu _{1,

2} , Siqi Cheng ₁ , Shunhua Xiao ₁ , Wenna Li ₁ , Zhuo Chen ₁ , Wei Li ₃ , Bin Huang ₁ , Qingquan Liu ₄ , Quanqi Chen _{1,

4}

Affiliation

The dually decorated Na₃V₂(PO₄)₂F₃ by in‐situ formed carbon and three‐dimensional graphene (NVPF/C@3DG) is prepared via two hydrothermal steps and a high‐temperature calcination. Benefiting from the high electronic conductivity of carbon and 3DG, high surface area and the resulted high diffusion coefficients of Na⁺, NVPF/C@3DG displays superior electrochemical performance to the control NVPF/C. Between 2.5 and 4.5 V (vs. Na⁺/Na), NVPF/C@3DG presents the initial discharge capacity of 123.6 mAh g⁻¹ at 0.2 C (25.6 mA g⁻¹) and capacity retention of 92.1 % after 60 cycles, while NVPF/C shows initial discharge capacity of 119 mAh g⁻¹ and capacity retention of 84.1 % under the identical test conditions. Even at 15 C, the initial discharge capacity and capacity retention after 1000 cycles of NVPF/C@3DG are as high as 91.2 mAh g⁻¹ and 82.9 %, respectively, much better than the initial discharge capacity of 71.2 mAh g⁻¹ and the corresponding capacity retention of 76.4 % for NVPF/C, respectively.

中文翻译：

碳和3D石墨烯作为阴极材料对Na3V2（PO4）2F3进行双重装饰，作为高能量和高功率密度钠离子电池的阴极材料

通过两个水热步骤和高温煅烧制备由原位形成的碳和三维石墨烯（NVPF / C @ 3DG）双重装饰的Na ₃ V ₂（PO ₄）₂ F ₃。得益于碳和3DG的高电子电导率，高表面积以及所产生的Na ⁺高扩散系数，NVPF / C @ 3DG的电化学性能优于对照NVPF / C。之间在2.5和4.5（相对于钠⁺ / NA），NVPF / C @ 3DG礼物123.6毫安克初始放电容量^-1以0.2C（25.6毫安克^-1）和60个循环后的容量保持率为92.1％，而NVPF / C在相同的测试条件下显示出119 mAh g ^-1的初始放电容量和84.1％的容量保持率。即使在15 C下，NVPF / C @ 3DG循环1000次后的初始放电容量和容量保持率也分别高达91.2 mAh g ^-1和82.9％，远优于71.2 mAh g ^-1和72.9 mAh g ^-1的初始放电容量。NVPF / C的相应容量保留率分别为76.4％。

更新日期：2020-10-02

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