(1 1 0)-Bridged nanoblocks self-assembled VS4 hollow microspheres as sodium-ion battery anode with superior rate capability and long cycling life
(1 1 0)-Bridged nanoblocks self-assembled VS4 hollow microspheres as sodium-ion battery anode with superior rate capability and long cycling life
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DOI：
10.1016/j.cej.2019.123385
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发表时间：
2020-03
影响因子：
15.1
通讯作者：
Wenbin Li;Jianfeng Huang;Ruizi Li;Liyun Cao;Xifei Li;Liangliang Feng;Shaoyi Chen
中科院分区：
文献类型：
--
作者：
Wenbin Li;Jianfeng Huang;Ruizi Li;Liyun Cao;Xifei Li;Liangliang Feng;Shaoyi Chen
开发结合功能壳和内部空隙的三维自组装中空纳米结构是实现高倍率和长寿命电池电极的重要途径。作为钠离子电池（SIB）的潜在高性能负极，（110）桥接纳米块自组装VS4空心微球（PNBH-VS4）是通过一种简便的一步水热法可控合成的。 (110)桥结构在纳米颗粒和纳米块之间构建了Na+传导通道和电子传输路径，自组装空心结构对纳米块过度的体积变化呈现出双空间物理捕获效应，协同提高了Na+存储动力学和结构稳定性。当用作 SIB 阳极时，PNBH-VS4 电极表现出优异的倍率性能和长循环寿命，优于以往报道的 VS4 基阳极材料。在0.2、0.5、1.0和2.0 A g−1时，经过250、200、350和700次循环后容量分别可达629、564、428和400 mAh g−1。即使在5.0 A g−1下，经过1000次长循环后容量仍能稳定在309 mAh g−1。此外，还发现PNBH-VS4电极分别在0.50-3.00和0.05-0.50V的电势范围内进行插入和转换反应，其中主要容量贡献源于插入反应。同时，PNBH-VS4电极在循环过程中分别在较低电流密度下表现出更好的插入可逆性，在较高电流密度下表现出更好的转换可逆性。
Development of three-dimensional self-assembled hollow nanoarchitectures combining functional shells and inner voids is an important approach for realizing high-rate and long-life battery electrodes. As a potential high-performance anode for sodium-ion batteries (SIBs), (1 1 0)-bridged nanoblocks self-assembled VS4hollow microspheres (PNBH-VS4) are controllably synthesized by a facile one-step hydrothermal method. The (1 1 0)-bridged structure constructs the Na+conducting channels and e−transfer paths among nano-grains and nanoblocks, and the self-assembled hollow structure presents the double space physical entrapment effect for the excessive volume change of nanoblocks, which synergistically improve the Na+storage kinetics and structure stability. When employed as an anode for SIBs, PNBH-VS4electrode exhibits the superior rate capability and long cycling life, outperforming those of the ever-reported VS4-based anode materials. At 0.2, 0.5, 1.0 and 2.0 A g−1, the capacity can reach 629, 564, 428 and 400 mAh g−1after 250, 200, 350 and 700 cycles, respectively. Even at 5.0 A g−1, the capacity can still stabilize at 309 mAh g−1after 1000 long cycles. In addition, it is revealed that PNBH-VS4electrode undertakes the insertion and conversion reaction in the potential range of 0.50–3.00 and 0.05–0.50 V, respectively, where the main capacity contribution originates from the insertion reaction. Meanwhile, PNBH-VS4electrode exhibits better insertion reversibility at lower current densities and conversion reversibility at higher current densities during cycling, respectively.