期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 19, 页码 16561-16571出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03608
关键词
lithium-rich layered oxide material; antimony doping; nanofiber; stabilized lattice oxygen; expanded layered phase lattice
资金
- Hunan Provincial Innovation Foundation for Postgraduate [CX2016B229]
- Natural Science Foundation of Hunan Province [2015JJ6103, 2015JJ2137]
- Key Project of Strategic New Industry of Hunan Province [2016GK4005, 2016GK4030]
Li-rich layered oxides (LLOs) with high specific capacities are favorable cathode materials with high-energy density. Unfortunately, the drawbacks of LLOs such as oxygen release, low conductivity, and depressed kinetics for lithium ion transport during cycling can affect the safety and rate capability. Moreover, they suffer severe capacity and voltage fading, which are major challenges for the commercializing development. To cure these issues, herein, the synthesis of high-performance antimony-doped LLO nanofibers by an electrospinning process is put forward. On the basis of the combination of theoretical analyses and experimental approaches, it can be found that the one-dimensional porous micro-/nanomorphology is in favor of lithium-ion diffusion, and the antimony doping can expand the layered phase lattice and further improve the lithium ion diffusion coefficient. Moreover, the antimony doping can decrease the band gap and contribute extra electrons to 0 within the Li2MnO3 phase, thereby enhancing electronic conductivity and stabilizing lattice oxygen. Benefitting from the unique architecture, reformative electronic structure, and enhanced kinetics, the antimony-doped LLO nanofibers possess a high reversible capacity (272.8 mA h g(-1)) and initial coulombic efficiency (87.8%) at 0.1 C. Moreover, the antimony-doped LLO nanofibers show excellent cycling performance, rate capability, and suppressed voltage fading. The capacity retention can reach 86.9% after 200 cycles at 1 C, and even cycling at a high rate of 10 C, a capacity of 172.3 mA h g(-1) can still be obtained. The favorable results can assist in developing the LLO material with outstanding electrochemical properties.
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