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Carbon coated Si nanoparticles anchored to graphene sheets with excellent cycle performance and rate capability for Lithium-ion battery anodes
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2021-05-05 , DOI: 10.1016/j.surfcoat.2021.127262
Junke Ou , Feng Jin , Hao Wang , Shugen Wu , Hongwei Zhang

Owing to their high theoretical capacity, silicon-based materials are thought to be the most potential anodic substances for lithium ion batteries. Nevertheless, the substantial volume changes of silicon leads to a severe pulverzation and fast capacity reduction. To improve these issues, a novel nitrogen doped carbon-coated silicon embedding in graphene sheet is well-developed by a facile approach. When fabricated as an anode in Li-ion batteries, the obtained silicon-based material manifests a large initial reversible capacity of 1870 mAh g−1, shows a superior initial Coulomb efficiency of 86.2%, and demonstrates a superior cycling property of 1045 mAh g−1 at 0.1 A g−1 after 200 cycles. Furthermore, a remarkable large capacity of 865 mAh g−1 is achieved even at a considerably elevated rate of 5 A g−1 and the capacity still remains at 1334 mAh g−1 when returns to 0.1 A g−1.



中文翻译:

碳包覆的Si纳米颗粒锚固在石墨烯板上,具有出色的循环性能和倍率性能,可用于锂离子电池阳极

由于其高的理论容量,硅基材料被认为是锂离子电池最有潜力的阳极物质。但是,硅的体积变化很大,会导致严重的粉化和快速的容量降低。为了改善这些问题,通过简便的方法很好地开发了在石墨烯片中嵌入氮掺杂碳涂层的新型硅。当制成锂离子电池的阳极时,所得硅基材料的初始可逆容量大,为1870 mAh g -1,初始库仑效率为86.2%,并且循环性能为1045 mAh g。200次循环后,在0.1 A g -1下为-1。此外,865 mAh g -1的超大容量甚至在相当升高速率将5克实现-1与容量仍然停留在1334毫安克-1时返回到0.1 A克-1

更新日期:2021-05-08
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