阴极
材料科学
单斜晶系
电导率
化学工程
涂层
复合数
图层(电子)
碳纤维
肺表面活性物质
粒子(生态学)
钠
离子
复合材料
化学
分子
有机化学
冶金
海洋学
地质学
工程类
物理化学
作者
Xiaochen Ge,Xinhai Li,Zhixing Wang,Huajun Guo,Guochun Yan,Xianwen Wu,Jiexi Wang
标识
DOI:10.1016/j.cej.2018.09.099
摘要
To solve the problem of poor conductivity, monoclinic NaVPO4F with a uniform carbon coating layer is synthesized via a facile solution approach with assistance of polyvinyl pyrrolidone (PVP). On one hand, PVP acts as a surfactant, encapsulating the precursor and restraining the particle growth. On the other hand, PVP is used as carbon source, in-situ generating a uniform carbon coating layer on the surface of NaVPO4F particles. The obtained NaVPO4F/C composite shows much enhanced electronic conductivity of 4.2 × 10−2 S cm−1. As a result, the synthesized NaVPO4F/C cathode for sodium ion batteries demonstrates superior cyclic stability and rate capability, delivering a reversible capacity of 111 mAh g−1 at 0.1 C, maintaining 81.8% capacity retention after 1000 cycles at 10 C and retaining a high capacity of 68 mAh g−1 at 20 C.
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