石墨烯
阴极
材料科学
阳极
碳纤维
化学工程
炭黑
电导率
电化学
电池(电)
复合数
纳米技术
复合材料
电极
化学
天然橡胶
物理化学
工程类
功率(物理)
物理
量子力学
作者
Junke Ou,Hao Wang,Hongwei Zhang,Shugen Wu,Wei Wang,Liang Zou,Feng Jin
标识
DOI:10.1016/j.jpowsour.2021.230654
摘要
Na3V2(PO4)2F3 (NVPF) is one of the Na-containing superionic conducting crystals, but it has a disadvantage of low intrinsic electronic conductivity. To improve this issue, [email protected]/G with a three-dimensional conductive structure from bio-carbon (buckwheat) and graphene is fabricated via a straightforward carbothermal reduction method. We use this material to construct cathodes for Na-ion batteries. The resulting [email protected]/G delivers high initial (equal to 137.5 mAh g−1 at 0.2 C) and stable long-term (equal to 110.5 mAh g−1 after 100 cycles) capacity. At 10 C, the capacity of the [email protected]/G-containing cathode is 80.6 mAh g−1. Furthermore, a Na-ion full-cell containing our [email protected]/G-based cathode and hard carbon anode shows outstanding cycling stability with the initial discharge capacity of 101.6 mAh g−1. The discharge capacity of this full cell returns to 90.4 mAh g−1 at 0.5 C after it is tested at various high rates. Such superior performances can be attributed to the 3D conductive network in [email protected]/G, which can increase the conductivity and improve the kinetics of the Na3V2(PO4)2F3. This work suggests that the buckwheat-derived carbon-coated Na3V2(PO4)2F3 enwrapped in graphene can be a potential active material for high rate and long-cycle Na-ion batteries.
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