Polydopamine-derived N-doped carbon-coated porous TiNb2O7 microspheres as anode materials with superior rate performance for lithium-ion batteries
Polydopamine-derived N-doped carbon-coated porous TiNb2O7 microspheres as anode materials with superior rate performance for lithium-ion batteries
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DOI：
10.1016/j.electacta.2020.137623
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发表时间：
2021-02-01
影响因子：
6.6
通讯作者：
Liu, Xiaodi
中科院分区：
文献类型：
--
作者：
Yang, Yan;Li, Zhengdao;Liu, Xiaodi
TiNb 2 O 7具有高倍率性能、安全性和可逆容量，被认为是高功率锂离子电池（LIB）的理想负极材料。然而，其应用受到其缓慢的锂离子扩散动力学和差的导电性的限制。本文以聚多巴胺为氮化碳前驱体，采用溶剂热法和碳化法成功制备了N掺杂碳包覆多孔TiNb 2 O 7微球。所得的TiNb 2 O 7 @N-C复合材料表现出显著的高倍率容量（30 C下为201 mAh g（-1））和上级的循环稳定性（10 C下500次循环后容量保持率为97.1%）。此外，TiNb 2 O 7 @N-C复合材料在与TiNb 2 O 7 @N-C全电池平行的LiNi0.5Mn0.3Co0.2O4中也表现良好（在10 C下500次循环后为128 mAh g（-1），容量保持率为91.7%）。这些结果表明，TiNb 2 O 7 @N-C复合材料具有作为下一代高倍率LIB的阳极材料的显著应用潜力。(C)2020爱思唯尔有限公司保留所有权利。
TiNb2O7 is considered as a promising anode material for high-power lithium-ion batteries (LIBs) due to its significantly high rate performance, safety, and reversible capacity. However, its application is limited by its sluggish Li-ion diffusion kinetics and poor electrical conductivity. Herein, N-doped carbon-coated porous TiNb2O7 microspheres were successfully synthesized via solvothermal route and the subsequent carbonization process using polydopamine as a nitrided and carbon precursor. The resulting TiNb2O7@N-C composite exhibited a significant high-rate capability (201 mAh g(-1) at 30 C) and superior cycling stability (capacity retention of 97.1% at 10 C after 500 cycles). Additionally, the TiNb2O7@N-C composite also performed well in a LiNi0.5Mn0.3Co0.2O4 parallel to TiNb2O7@N-C full cell (128 mAh g(-1)at 10 C after 500 cycles with a capacity retention of 91.7%). These results indicate that the TiNb2O7@N-C composite possesses significant potential for application as an anode material for next-generation high-rate LIBs. (C) 2020 Elsevier Ltd. All rights reserved.