钒
材料科学
烧结
扫描电子显微镜
磷酸铁锂
炭黑
介电谱
磷酸钒锂电池
碳纤维
化学工程
核化学
矿物学
冶金
电化学
复合材料
化学
复合数
工程类
物理化学
天然橡胶
电极
作者
Anne Zulfia Syahrial,W C Pawito,Nofrijon Sofyan,W. M.F. Rahmatulloh
出处
期刊:IOP conference series
[IOP Publishing]
日期:2019-09-05
被引量:1
标识
DOI:10.1088/1757-899x/547/1/012023
摘要
Synthesis of lithium iron phosphate (LiFePO4) via wet chemical followed by a hydrothermal method has been carried out. The preparation of LiFePO4 was begun with the precursor of LiOH, NH4H2PO4, and FeSO4.7H2O mixed stoichiometrically. After the synthesis, LiFePO4 was doped using vanadium and then coated using two types of carbon sources, i.e. carbon black blended with activated carbon pyrolyzed from bamboo, through a solid-state reaction. The materials were mixed using a ball-mill and subsequently characterized using a thermal analyzer (STA) to determine the sintering temperature. The result shows that LiFePO4 formation temperature is at 639°C. The sintering process was performed for 4 hours and the characterization was done using X-ray diffraction (XRD) and electron microscope (SEM) equipped with energy dispersive x-ray spectroscopy (EDX). The electrochemical impedance spectroscopy (EIS) testing was performed to show the conductivity of the formed materials. XRD result showed that LiFePO4/V/C phase has formed with an olivine structure, while the SEM result showed fair distribution and small particle size with some agglomerated microstructures. The EIS results showed that carbon coating on the active material increases the conductivity, whereas the addition of vanadium increases the conductivity of up to 5 wt.% vanadium but decreases at 7 wt.% vanadium.
科研通智能强力驱动
Strongly Powered by AbleSci AI