期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 49, 页码 45612-45620出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14912
关键词
lithium-ion batteries; silicon; silicon oxide; vanadium nitride; graphitization carbon
资金
- National Natural Science Foundation of China [51602210]
- Fundamental Research Funds for the Central Universities of China [2017SCU04A05, YJ201470]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Sichuan Province, China [CRSBF2019764, CRSBF201814501]
SiOx-based anode materials with high capacity and outstanding cycling performance have gained numerous attentions. Nevertheless, the poor electrical conductivity and non-negligible volume change hinder their further application in Li-ion batteries. Herein, we propose a new strategy to construct a hollow nanosphere with boron-doped Si/SiOx decorated with vanadium nitride (VN) nanoparticles and embedded in a nitrogen-doped, porous, and partial graphitization carbon layer (B-Si/SiOx@VN/PC). Benefiting from such structural and compositional features, the B-Si/SiOx@VN/PC electrode exhibits a stable cycling capacity of 1237.1 mA h g(-1) at a current density of 0.5 A g(-1) with an appealing capacity retention of 87.0% after 300 cycles. Additionally, it delivers high-rate capabilities of 1139.4, 940.7, and 653.4 mA h g(-1) at current densities of 2, 5, and 10 A g(-1), respectively, and ranks among the best SiOx-based anode materials. The outstanding electrochemical performance can be ascribed to the following reasons: (1) its hollow structure makes the Li+ transportation length decreased. (2) The existing nanopores facilitate the Li+ insertion/desertion and accommodate the volume variation. (3) The nitrogen-doped partial graphitization carbon enhances the electrical conductivity and promotes the formation of stable solid electrolyte interface layers during the repetitive Li+ intercalation/extraction process.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据