Controllable Synthesis of Na3V2(PO4)3/C Nanofibers as Cathode Material for Sodium-Ion Batteries by Electrostatic Spinning
Controllable Synthesis of Na3V2(PO4)3/C Nanofibers as Cathode Material for Sodium-Ion Batteries by Electrostatic Spinning
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DOI：
10.3389/fchem.2018.00617
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发表时间：
2018-12
影响因子：
5.5
通讯作者：
Ling Wu;Yueying Hao;Shaonan Shi;Xiaoping Zhang;Huacheng Li;Yulei Sui;Liu Yang;Shengkui Zhong
中科院分区：
文献类型：
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作者：
Ling Wu;Yueying Hao;Shaonan Shi;Xiaoping Zhang;Huacheng Li;Yulei Sui;Liu Yang;Shengkui Zhong
采用预还原辅助静电纺丝方法制备了Na3V2(PO4)3/C纳米纤维。为了在煅烧后保持Na3V2(PO4)3/C样品的完美纤维结构，对一系列热处理参数进行了详细研究。研究发现热处理工艺对Na3V2(PO4)3/C复合纳米纤维的形貌和电化学性能有重要影响。在800℃、10h、升温速率2.5℃min−1的条件下，成功获得了结晶良好、均匀、电化学性能优异的Na3V2(PO4)3/C纳米纤维。纳米纤维在0.05、1和10C下的初始放电比容量分别为114.0、106.0和77.9 mAh g-1。 0.05C下循环100次后容量保持率仍保持在97.0%。这种通过简单的静电纺丝方法制备的光滑、均匀、连续的Na3V2(PO4)3/C复合纳米纤维有望成为钠离子电池的优异正极材料。
Na3V2(PO4)3/C nanofibers are prepared by a pre-reduction assisted electrospinning method. In order to maintain the perfect fibrous architecture of the Na3V2(PO4)3/C samples after calcining, a series of heat treatment parameters are studied in detail. It is found that the heat treatment process shows important influence on the morphology and electrochemical performance of Na3V2(PO4)3/C composite nanofibers. Under the calcining conditions of 800°C for 10 h with a heating rate of 2.5°C min−1, the well-crystallized uniform Na3V2(PO4)3/C nanofibers with excellent electrochemical performances are successfully obtained. The initial discharge specific capacities of the nanofibers at 0.05, 1, and 10C are 114.0, 106.0, and 77.9 mAh g−1, respectively. The capacity retention still remains 97.0% after 100 cycles at 0.05C. This smooth, uniform, and continuous Na3V2(PO4)3/C composite nanofibers prepared by simple electrospinning method, is expected to be a superior cathode material for sodium-ion batteries.