Carbon-Coated Self-Assembled Ultrathin T-Nb2o5 Nanosheets For High-Rate Lithium-Ion Storage With Superior Cycling Stability
ACS APPLIED ENERGY MATERIALS(2020)
摘要
Niobium pentoxide (Nb2O5) with the advantages of high working potential and negligible volume expansion has been an attractive canditate for lithium-ion battery (LIB) applications. Unfortunately, the intrinsic shortcoming of sluggish electron transportation hinders its widespread application as an effective anode material. Here, we present the successful construction of carbon-coated self-assembled three-dimensional (3D) ultrathin T-Nb2O5 nanosheets (T-Nb2O5@C). The carbon layer and ultrathin nanosheets endow Nb2O5 with high electronic conductivity, prominent structural stability, and short ion-diffusion path, thus significantly improving lithium-ion transportation and storage properties. Consequently, when adopted as a LIB anode, the T-Nb2O5@C nanocomposite demonstrates excellent discharge capacity (231.9 mA h g(-1) at 0.1 A g(-1)) and rate performance (62.0% capacity retention with the current density increasing from 0.1 to 5.0 A g(-1)). T-Nb2O5@C can also deliver superior cycling stabilities of 97.8 and 94.6% after 200 cycles at 0.2 A g(-1) and 1000 cycles at 2 A g(-1), respectively. Therefore, the T-Nb2O5@C exhibits great prospects for ultrafast and durable LIBs.
更多查看译文
关键词
T-Nb2O5, carbon coating, lithium-ion storage, rate performance, cycling stability
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要