Jinpeng Yin, Guanqin Wang, Dongqing Kong, Chuang Li, Qiang Zhang, Dongbai Xie, Yangyang Yan, Ning Li, Qiang Li
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引用次数: 0
摘要
为了提高氧化钛（TiO2）作为锂离子电池（LIB）负极材料的体积能量密度和初始库仑效率（ICE），本研究采用表面约束原位互生长机制制备了TiO2包埋碳微球复合材料。结果表明，该复合材料具有氧空位和碳高度集成的TiO2结构，并且具有极小的比表面积（11.52 m2/g）。由于其独特的微观结构，该复合材料表现出优异的锂存储性能，包括高达75%的ICE，在0.2 a /g下200次循环后的426.8 mAh/g的显著容量，在5 a /g下的210.1 mAh/g的优异倍率性能，以及出色的循环寿命，在2000次循环中，每循环的容量衰减率仅为0.003%。电化学动力学研究进一步验证了该微结构的优越性。
Nonporous TiO2@C microsphere with a highly integrated structure for high volumetric lithium storage and enhance initial coulombic efficiency.
To enhance the volumetric energy density and initial coulombic efficiency (ICE) of titanium oxide (TiO2) as anode electrode material for lithium-ion batteries (LIB), this study employed a surface-confined in-situ inter-growth mechanism to prepare a TiO2 embedded carbon microsphere composite. The results revealed that the composite exhibited a highly integrated structure of TiO2 with oxygen vacancies and carbon, along with an exceptionally small specific surface area of 11.52 m2/g. Due to its unique microstructure, the composite demonstrated remarkable lithium storage properties, including a high ICE of 75%, a notable capacity of 426.8 mAh/g after 200 cycles at 0.2 A/g, superior rate performance of 210.1 mAh/g at 5 A/g, and an outstanding cycle life, with a capacity decay rate of only 0.003% per cycle over 2000 cycles. Furthermore, electrochemical kinetic studies further validated the advantages of this microstructure.
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