A 'Biconcave-Alleviated' Strategy to Construct Aspergillus niger-Derived Carbon/MoS2 for Ultrastable Sodium Ion Storage
| Autor: | Xianbao Wang, Yao Zhou, Longze Zhao, Shi-Gang Sun, Chen-Xu Luo, Weixin Chen, Tao Mei, Yong Cheng, Xiang Xiao, Ming-Sheng Wang, Ling Huang, Hong-Gang Liao, Jing-Jing Fan, You-Hu Chen, Shiyuan Zhou, Sangui Liu |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ACS Nano. 15:13814-13825 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Two-dimensional layered materials commonly face hindered electron transfer and poor structure stability, thus limiting their application in high-rate and long-term sodium ion batteries. In the current study, we adopt finite element simulation to guide the rational design of nanostructures. By calculating the von Mises stress distribution of a series of carbon materials, we find that the hollow biconcave structure could effectively alleviate the stress concentration resulting from expansion. Accordingly, we propose a biconcave-alleviated strategy based on the Aspergillus niger-derived carbon (ANDC) to construct ANDC/MoS2 with a hollow biconcave structure. The ANDC/MoS2 is endowed with an excellent long-term cyclability as an anode of sodium ion batteries, delivering a discharge capacity of 496 mAh g-1 after 1000 cycles at 1 A g-1. A capacity retention rate of 94.5% is achieved, an increase of almost seven times compared with the bare MoS2 nanosheets. Even at a high current density of 5 A g-1, a reversible discharge capacity around 400 mAh g-1 is maintained after 300 cycles. ANDC/MoS2 could also be used for efficient lithium storage. By using in situ TEM, we further reveal that the hollow biconcave structure of ANDC/MoS2 has enabled stable and fast sodiation/desodiation. |
| Databáze: | OpenAIRE |
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