Electrospun Li3V2(PO4)3 nanocubes/carbon nanofibers as free-standing cathodes for high-performance lithium-ion batteries
Electrospun Li3V2(PO4)3 nanocubes/carbon nanofibers as free-standing cathodes for high-performance lithium-ion batteries
复制标题
静电纺Li3V2(PO4)(3)纳米立方体/碳纳米纤维作为高性能锂离子电池的独立式阴极
DOI：
10.1039/c9ta02740h
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发表时间：
2019-06-28
影响因子：
11.9
通讯作者：
Duan, Xiaochuan
中科院分区：
文献类型：
--
作者：
Peng, Yi;Tan, Rou;Duan, Xiaochuan
Lithium vanadium phosphate Li3V2(PO4)(3) (LVP)-based cathodes have attracted much attention in pursuit of high-performance lithium-ion batteries (LIBs). In this study, an ionic liquid (IL) has been introduced into the electrospinning process for the first time, successfully leading to the formation of free-standing cathodes built up of LVP nanocubes embedded in N-doped carbon nanofibers (LVP-NC/NCNF). In particular, the IL plays multiple roles in the resulting free-standing cathodes: (i) the IL improves the feasibility of the PAN-based electrospinning system for preparing electrode materials due to its good solubility, resulting in a self-supporting substrate conductive network with good mechanical properties and electrical conductivity; (ii) the IL can act as a structure-directing agent to induce the formation of (100) facet-oriented LVP nanocubes, giving rise to a convenient lithium-ion transport path; and (iii) the IL adsorbed on the surface of LVP nanocubes can form a N-doped dual-phase carbon coating layer during the heat-treatment process, further enhancing the electronic conductivity of the entire electrode. As a result, LVP-NC/NCNF free-standing electrodes exhibit an outstanding electrochemical performance including a high specific capacity, stable cycling performance and superior rate capability. Specially, the LVP-NC/NCNF free-standing cathodes deliver a high discharge capacity of 143.6mA h g(-1) at 5C for a prolonged cycling life of over 1000 cycles. It is highly expected that this facile IL-assisted electrospinning method can be expanded to other polyanion-based cathodes, thus presenting new opportunities for the design and fabrication of high-performance free-standing electrodes for LIBs.
