Electrochemical performance of Li4Ti5O12/carbon nanotubes/graphene composite as an anode material in lithium-ion batteries
Electrochemical performance of Li4Ti5O12/carbon nanotubes/graphene composite as an anode material in lithium-ion batteries
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Li4Ti5O12/碳纳米管/石墨烯复合材料作为锂离子电池负极材料的电化学性能
DOI：
10.1016/j.ijhydene.2016.09.089
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发表时间：
2017-03
影响因子：
7.2
通讯作者：
Tao Luo
中科院分区：
文献类型：
--
作者：
Yuting Chen;Haiyan Zhang;Yunyong Li;Yiming Chen;Tao Luo
采用球磨-微波加热法制备了三维Li 4 Ti 5 O 12/碳纳米管/石墨烯复合材料（LTO-CNT-G）。与Li 4 Ti 5 O 12/CNTs（LTO-CNT）和Li 4 Ti 5 O 12/graphene（LTO-G）复合材料相比，LTO-CNT-G复合材料作为锂离子电池负极材料，在较高的电流密度下表现出更好的上级倍率性能和循环性能。石墨烯纳米片和碳纳米管被用来构建三维导电网络，导致在锂离子可逆反应过程中更快的电子转移和更低的电阻，这显著提高了LTO-CNT-G复合材料的电化学活性。石墨烯和碳纳米管的协同效应可以大大提高Li 4 Ti 5 O 12基负极的倍率性能和循环稳定性。LTO-CNT-G复合材料表现出在0.2 C下172 mAh g− 1和在20 C下132 mAh g− 1的高初始放电容量，以及优异的循环稳定性。电化学阻抗谱表明，与LTO-CNT和LTO-G复合材料相比，LTO-CNT-G复合材料具有最小的电荷转移电阻，说明石墨烯和碳纳米管的三维网络结构在锂离子的嵌入/脱嵌过程中实现了从电解质到LTO-CNT-G活性材料的快速电子转移。
A three-dimensional Li4Ti5O12/carbon nanotubes/graphene composite (LTO-CNT-G) was prepared by ball-milling method, followed by microwave heating. The as-prepared LTO-CNT-G composite as anode material in lithium-ion battery exhibited superior rate capability and cycle performance under relative high current density compared with that of Li4Ti5O12/CNTs (LTO-CNT) and Li4Ti5O12/graphene (LTO-G) composites. Graphene nanosheets and CNTs were used to construct 3D conducting networks, leading to faster electron transfer and lower resistance during the lithium ion reversible reaction, which significantly enhanced the electrochemical activity of LTO-CNT-G composite. The synergistic effect of graphene and CNTs can greatly improve the rate capability and cycling stability of Li4Ti5O12-based anodes. The LTO-CNT-G composite exhibited a high initial discharge capacity of 172 mAh g−1at 0.2 C and 132 mAh g−1at 20 C, as well as an excellent cycling stability. The electrochemical impedance spectroscopy demonstrated that the LTO-CNT-G composite has the smallest charge-transfer resistance compared with the LTO-CNT and LTO-G composites, indicating that the fast electron transfer from the electrolyte to the LTO-CNT-G active materials during the lithium ion intercalation/deintercalation owing to the three-dimensional networks of graphene and CNTs.
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