ZHANG Wei (1996-), female, Master candidate. E-mail: zhangwei121125@163.com
Si/C@graphene(GR)/graphite(G) composite anode materials were prepared by a simple and easy-to-operate wet coating method with silicon nanoparticles and graphite as main raw materials, fatty alcohol polyoxyethylene ether as a surfactant and graphene. The effect of allocation ratio on the composition, morphology and electrochemical performance of the composite materials was investigated. The results show that the prepared composite materials exhibit a superior cycling stability, and the volume expansion alleviates. When the silicon nanoparticles content is 10%, the initial discharge capacity is approximately 730 mA·h/g. After 100 cycles at a current density of 100 mA/g, the discharge capacity can stably maintain at 500 mA·h/g. The initial coulomb efficiency reaches 87.27%, revealing a great improvement in comparison with the efficiency of pure silicon material (i.e., less than 70%).
| 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 |