电化学
碳纤维
材料科学
高分辨率透射电子显微镜
热重分析
拉曼光谱
化学工程
结晶度
分解
沉积(地质)
化学气相沉积
纳米技术
化学
电极
透射电子显微镜
复合材料
复合数
有机化学
物理化学
工程类
物理
古生物学
光学
生物
沉积物
作者
Abhishek Bhardwaj,Amrish K. Panwar
标识
DOI:10.1016/j.apsusc.2021.151449
摘要
In this study, carbon shell was synthesized over the surface of NaCrO2 using chemical vapor decomposition to make it a potential cathode material for sodium-ion batteries. Carbon deposition has been attempted by the decomposition of C2H2 gas at elevated temperature to enhance the electrochemical performance of pristine NaCrO2. Hence, a series of samples were synthesized by varying the time of exposure of C2H2 over the surface of NaCrO2. The XRD data reveals the proper phase formation of pristine NaCrO2 and NaCrO2 /C. FESEM and HRTEM indicate the presence of carbon shell over the NaCrO2, making it a core–shell structure. Raman analysis has been performed to see the crystallinity of the deposited carbon on the surface of NaCrO2. Moreover, Thermogravimetric analysis has been carried to calculate the amount of carbon deposition with the variation of exposure time. The electrochemical performance of pristine and exposed NaCrO2 are also studied. It reveals the highest specific capacity of 126.5 mAhg−1 at 0.5C. The highest capacity retention of about 89 % has been observed for optimized carbon deposited sample after 40 cycles at 1C rate. These results are helpful to understand the role of carbon deposition as a conductive additive on electrochemical properties.
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