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Outline
Silicon oxide (SiOx, 0<x<2) anode suffer from low intrinsic conductivity, unstable solid electrolyte interphase (SEI), and mechanical stress failure caused by volume expansion during cycling. To tackle these challenges, a modification strategy was proposed, featuring the synergistic regulation of a surface fast-ion coating layer and an in-situ constructed three-dimensional (3D) carbon nanotubes (CNTs) conductive network. Nano-sized Al2O3 was uniformly coated on the surface of SiOx via solid-phase mechano-fusion technology, and also converted into a fast ionic conductor layer with high ionic mobility during electrochemical activation. Subsequently, a 3D CNTs conductive network was constructed on the outer layer of the material via chemical vapor deposition (CVD). Structural and morphological characterizations reveal that the in-situ grown CNTs are tightly interwined on the particle surfaces and within the interstices, establishing efficient electron transport pathways. The synergistic effect of LiAlO2 and CNTs greatly enhances interfacial ion transport capacity and overall electronic conductivity. Electrochemical measurements indicate that the modified SiOx@ Al2O3 @ CNTs material exhibits outstanding electrochemical performance. It delivers discharge specific capacities of 1 283.2, 1 255.4, 1 236.4, 1 201.0 and 1 165.8 mAh/g at current densities of 0.2C, 0.5C, 1C, 2C and 4C, respectively. Furthermore, it retains a high specific capacity of approximately 1 000 mAh/g after 200 cycles at 0.1C, far exceeding 552.3 mAh/g of unmodified SiOx. This study has verified the synergistic enhancement of ion/electron conductive network, and provides a promising technical solution for development of high-energy-density and highly stable silicon-based anode materials.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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