JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Sainan Liu,Haimin Zhang,Mingzhe Zhou,Xinxiang Chen,Yangyang Sun,Yi Zhang
Sodium- and potassium-ion batteries (SIBs and PIBs), as the next-generation batteries, attract a lot of attention due to the abundance and even distribution of sodium and potassium sources. However, both SIBs and PIBs need high-performing active anode materials to widen their industrial applications. Transition metal sulfides, possessing high theoretical capacity, show promise for SIB and PIB anodes. However, the structural instability of these sulfides occurring due to the volume changes during the active ion insertion and release limits their applications. In this work, V 5 S 8 nanoparticles anchored on carbon nanofibers (V 5 S 8 @CNF) were fabricated for SIB and PIB anodes. The SIB cells exhibited outstanding performance with 351.0 mA h g −1 specific capacity after 400 cycles at 0.2 A g −1 . A similar PIB cell demonstrated 289.2 mA h g −1 specific capacity after 200 cycles at 0.1 A g −1 . Long-term stability of SIBs and PIBs for 10,000 and 2000 cycles at 2 and 1 A g −1 , respectively, showed very stable specific capacities equal to 251.0 and 190.1 mA h g −1 . The outstanding energy-storage-related properties of the sulfide-based anodes provide insights into techniques for improving Na + and K + electrochemical reactions assisted by two-dimensional layered transition metal sulfides.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Chao Yue Zhang,Guo Wen Sun,Zu De Shi,Qian Yu Liu,Jiang Long Pan,Yan Chun Wang,Hao Zhao,Geng Zhi Sun,Xiu Ping Gao,Xiao Jun Pan,Jin Yuan Zhou
Atom-intercalated transition metal disulfides (TMDs) have attached much attention mainly due to their highly improved conductivity. But it is few reported that the atom intercalation can enable the TMDs have unexpected catalytic properties, caused by the unit-cell deformation in them. In this work, a type of V 0.25 -intercalated VS 2 (V 5 S 8 ) nanoflakes was designed via a direct vulcanization method combining Kirkendall heat diffusion effect, and used as the promotor for lithium-sulfur batteries (LSBs). The V 5 S 8 possesses a NiAs crystal structure, in which V atoms occupy the interlayer spacing between VS 2 monolayers, which will unavoidably cause the unit-cell deformation. As expected, the CNF@V 5 S 8 /S cathodes show a specific capacity of 1260 mAh g −1 at 0.2 C, and can keep 73.65% of the capacity with charge/discharge rate increasing 10 times; while the CNF@VS 2 /S ones can only retain 54.0% of the initial capacity. Moreover, the CNF@V 5 S 8 /S cathodes show an ultralow decay rate of only 0.0312% per cycle for 1500 cycles at 5 C. Furthermore, the catalysis effect of V 5 S 8 on the conversion of lithium polysulfide (Li 2 S n , n = 1, 2, 4, 6 and 8) and S 8 clusters were systematically discusses. Besides, the V 5 S 8 can further enable LSBs achieve a high areal capacity (8.2 mAh cm −2 with sulfur loading of 7.8 mg cm −2 ) and a high dynamic flexible stability at bending angle between 0 and 180 °.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 9
·5033-5044
·
IF 7.79
Lihong Xu,Xiaochuan Chen,Wenti Guo,Lingxing Zeng,Tao Yang,Peixun Xiong,Qinghua Chen,Jianmin Zhang,Mingdeng Wei,Qingrong Qian
The construction of anode materials for sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) with a high energy and a long lifespan is significant and still challenging. Here, sulfur-defective vanadium sulfide/carbon fiber composites (D-V5S8/CNFs) are designed and fabricated by a facile electrospinning method, followed by sulfuration treatment. The unique architecture, in which V5S8 nanoparticles are confined inside the carbon fiber, provides a short-range channel and abundant adsorption sites for ion storage. Moreover, enlarged interlayer spacings could also alleviate the volume changes, and offer small vdW interactions and ionic diffusion resistance to store more Na and K ions reversibly and simultaneously. The DFT calculations further demonstrate that sulfur defects can effectively facilitate the adsorption behavior of Na+ and K+ and offer low energy barriers for ion intercalation. Taking advantage of the functional integration of these merits, the D-V5S8/CNF anode exhibits excellent storage performance and long-term cycling stability. It reveals a high capacity of 462 mA h g−1 at a current density of 0.2 A g−1 in SIBs, while it is 350 mA h g−1 at 0.1 A g−1 in PIBs, as well as admirable long-term cycling characteristics (190 mA h g−1/17 000 cycles/5 A g−1 for SIBs and 165 mA h g−1/3000 cycles/1 A g−1 for PIBs). Practically, full SIBs upon pairing with a Na3V2(PO4)3 cathode also exhibit superior performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chencheng Sun,Xiaoyu Wang,Jitao Geng,Yu Tan,Chengkui Lv,Cunqing Pei,Huaixin Wei,Dong Chen,Jun Yang
The development of electrode materials for Sodium-Ion Batteries (SIBs) has received more and more attention. Among them, vanadium sulfide, as a member of the transition metal sulfide family, owns the characteristics of rich electrochemical activity, high theoretical capacity and adjustable spatial structure. However, the complicated synthetic process, poor rate capability and intricate redox mechanism of vanadium sulfides make them less competitive for commercial use. In this work, a facile approach based on the ball-milling technique followed by adjusted annealing temperature is introduced to fabricate large-scale vanadium sulfides. This general phase-controlled method can bring three different crystal types of V 5 S 8 , V 3 S 4 and V 3 S 5 . With homogeneous covering of super P and Carbon Nano Tubes (CNTs), a conductive network that favors the Na ions/electrons transport in the vanadium sulfides-based electrodes can be fabricated. The V 5 S 8 exhibits the best performance in SIBs with specific capacity of 918 mAh g −1 at 0.1 A g −1 (100 cycles). Moreover, V 5 S 8 electrode also exhibits an ultra-rate capability of 333 mAh g −1 at 50 A g −1 after cycling lifespan (4000 loops). The extremely high pseudo-capacitance characteristics of V 5 S 8 is significant during the SIBs discharge/charge. Additionally, the V 5 S 8 anode also shows the high energy density of 165 Wh kg −1 in SIBs full cell.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）