煅烧
材料科学
热液循环
扩散
石墨烯
阴极
碳纤维
离子
电导率
分析化学(期刊)
电化学
化学工程
化学
电极
纳米技术
复合材料
复合数
色谱法
工程类
物理
物理化学
热力学
催化作用
有机化学
生物化学
作者
Lizhen Hu,Siqi Cheng,Shunhua Xiao,Wenna Li,Zhuo Chen,Wei Li,Bin Huang,Qingquan Liu,Quanqi Chen
标识
DOI:10.1002/celc.202000881
摘要
Abstract The dually decorated Na 3 V 2 (PO 4 ) 2 F 3 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.
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