Full
WANG Can (1997-), male, Master candidate. E-mail: hfutwangcan@163.com
Outline
It is important for the further improvement of lithium-ion battery energy densities to develop high-specific-capacity cathode materials. Li3V2O5 has attracted much attention due to its high specific capacity, even exceeding 240 mA·h/g. However, its low electrochemical cycling stability induced by the low Li+ transport dynamics and irreversible phase transition restricts the application of Li3V2O5 cathode materials in lithium-ion batteries. In this paper, co-doped Li3V2O5 nanorod cathode materials were prepared. The one-dimensional structure can relieve the accumulation of strain during charging and discharging process. Also, Co3+ doping can stabilize the structure of Li3V2O5 by forming the more intense Co—O bonds. Furthermore, Co3+ doping expands the cell volume and ratio of V4+ in Li3V2O5. These collectively result in the improved Li+ diffusion coefficient and cycling stability of Li3V2O5. The 1% Co-doped Li3V2O5 (i.e., 1%Co-LVO sample) has a specific discharge capacity of 256.43 mA·h/g at a current density of 50 mA/g and a capacity retention rate of 77.3% after 100 cycles, which is 28% greater than that of the pristine Li3V2O5. 1%Co-LVO sample shows a superior capacity fading (i.e., 0.23%/cycle). This paper can provide an effective method for the preparation and performance regulation of high-energy-density lithium-ion cathode material (i.e., Li3V2O5).
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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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