储能科学与技术2024，Vol.13Issue(7)：2116-2123,8.DOI:10.19799/j.cnki.2095-4239.2024.0408
多元包覆石墨复合负极材料的低温电化学储锂性能研究
Multicomponent-coated graphite composite anodes for low-temperature electrochemical energy storage
摘要
Abstract
The rapid development of new energy technologies has demanded higher requirements for the application of lithium-ion batteries(LIBs)for operation at low temperatures.The poor surface dynamics of graphite anodes is one of the main issues limiting the low-temperature performance of LIBs.In this study,amorphous carbon/niobium oxide multicomponent-coated graphite composite materials(C/Nb-Gr)were synthesized using a liquid-phase method.The optimal C/Nb-Gr ratio was determined by adjusting the preparation method and coating ratio of multicomponent materials.The crystal structure,morphology,and elemental distribution of C/Nb-Gr were characterized using X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and energy-dispersive X-ray spectroscopy.Furthermore,its electrochemical performance at high rates and low temperatures was evaluated using cyclic voltammetry,electrochemical impedance spectroscopy,and charge/discharge cycling.The graphite electrode coated with amorphous carbon/niobium oxide exhibited improved performance at high rates and low temperatures.When charged/discharged at a high current density of 5C at room temperature,C/Nb-Gr-10 demonstrated a reversible specific capacity of 156.18 mAh/g.Under low-temperature conditions(-20℃)at a current density of 0.1C,the discharge specific capacity of C/Nb-Gr-10 was 204.60 mAh/g,representing 55.7%of its room-temperature discharge specific capacity.关键词
石墨负极/表面改性/低温储能/锂离子电池Key words
graphite anodes/surface modification/low-temperature energy storage/lithium-ion batteries分类
信息技术与安全科学引用本文复制引用
肖鹏飞,梅琳,陈立宝..多元包覆石墨复合负极材料的低温电化学储锂性能研究[J].储能科学与技术,2024,13(7):2116-2123,8.基金项目
国家自然科学基金(92372117),湖南省自然科学基金(2022JJ20068),中南大学创新驱动基金(2023CXQD024). （92372117）
