Mesoporous TiNb2O7 microspheres as high performance anode materials for lithium-ion batteries with high-rate capability and long cycle-life
Mesoporous TiNb2O7 microspheres as high performance anode materials for lithium-ion batteries with high-rate capability and long cycle-life
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介孔TiNb2O7微球作为高性能锂离子电池负极材料，具有高倍率性能和长循环寿命
DOI：
10.1016/j.electacta.2017.10.138
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发表时间：
2018-01-01
影响因子：
6.6
通讯作者：
Zhang, Tianmeng
中科院分区：
文献类型：
--
作者：
Liu, Guangyin;Zhao, Lingfei;Zhang, Tianmeng
作为潜在的高性能锂离子电池负极材料，采用表面溶剂热-煅烧法合成了介孔TiNb 2 O 7（M-TNO）微球。由于减少了电荷和离子转移距离，M-TNO样品显示出更小的电荷转移电阻和更快的Li离子扩散。M-TNO中的空隙空间可以通过缓冲循环过程中的体积变化而具有结构稳定性，从而导致长的循环寿命。在0.1C下，首次循环的比容量可达319 mAh·g（-1），在随后的循环中，该电极的循环性能和动力学性能均上级。M-NTO在1C和10 C下表现出优异的高倍率性能，其高倍率容量为155 mA·h·g（-1），在10 C下500次循环后容量衰减非常缓慢，每次循环仅为0.03%。电化学测试结果表明，提高倍率容量和延长循环寿命的主要原因是增大了电容容量的比例，减小了电荷转移电阻，加快了Li+离子的扩散。(c)2017爱思唯尔有限公司版权所有
As potential high-performance anode materials for Li-ion batteries (LIBs), mesoporous TiNb2O7 (M-TNO) microspheres were synthesized through a facial solvothermal and subsequent calcination process. Due to the reduced charge and ion transfer distances, the M-TNO samples showed smaller charge transfer resistance and faster Li ion diffusion. The void space in the M-TNO can boast the structural stability by buffer the volume change during cycling to result in long cycle life. A high specific capacity of 319 mA h g(-1) can be realized in the first cycle at 0.1 C, and the cyclability and kinetics were superior at the electrode in the following cycles. The M-NTO presented outstanding high rate performances at 1 C and 10 C, with a high rate capacity of 155 mA mA h g(-1) and a very slow capacity fading of 0.03% per cycle after 500 cycles at 10 C. Electrochemical measurements indicating that the elevated rate capacity and long cycle life were derived from the more proportion of capacitive capacity, smaller charge transfer resistance and faster Li+ ion diffusion. (c) 2017 Elsevier Ltd. All rights reserved.