基于稻谷壳的多孔生物质碳锂离子电池负极材料的制备及性能研究

Preparation and performance of porous biomass carbon cathode material based on rice hull for lithium-ion battery

以废弃的稻谷壳为原料,基于酸解-水热碳化-刻蚀法制备了无定形多孔碳材料,采用X射线衍射仪(XRD)、拉曼光谱(Raman)和扫描电子显微镜(SEM)表征了材料结构及形貌,并结合恒流充放电技术测试了材料的电化学性能。结果表明,获得的无定形碳材料呈现出多孔结构,碳电极的首次可逆容量为171.6mAh/g,经历30次循环后依然能保持146.7mAh/g的可逆容量,比未刻蚀碳电极容量(96.3mAh/g)高52%。刻蚀碳电极表现出优异的循环稳定性能,缘于碳材料的多孔结构,可加快锂离子在本体材料和电极/电解液界面间的传输。

The amorphous porous carbon materials from rice hull were prepared by acid hydrolysishydrothermal carbonization-etching method.The structure and morphology of the material were characterized by X-Ray Diffractometer(XRD),raman spectrum(Raman)and scanning electron microscope(SEM).The electrochemical performance was investigated by constant current charge/discharge technique.The results shown that the higher initial specific capacity of 171.6 mAh/g can be obtained and the reversible capacity of 146.7 mAh/g still be retained after 30 cycles,which was about 52%higher than the untreated electrode(96.3 mAh/g).The etched electrode exhibited superior cycling behavior,and it was ascribing to the porous structure,accelerating the transfer of lithium ion in the bulk material and electrode/electrolyte interface.