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Synthesis of mixed ionic–electronic Li + –NASICON glass-ceramic nanocomposites for cathode applications
Journal of Solid State Electrochemistry ( IF 2.5 ) Pub Date : 2020-06-13 , DOI: 10.1007/s10008-020-04706-y
Neelakshi Sharma , Anshuman Dalvi

A novel route for preparation of mixed ionic–electronic (MIE) glass-ceramics is proposed. Glass-ceramic nanocomposites are prepared by externally dispersing MIE glass viz. [Li2O]x-[V2O5-P2O5]100 − x (where x = 10 and 20 wt% with and the ratio of V2O5 and P2O5 has been kept to 9:1 and 3:1) in the NASICON-structured LiTi2(PO4)3 (LTP) matrix using mechanical milling-assisted synthesis route. After subjecting these glass-ceramic composites to suitable sintering temperature, the samples are structurally and electrically characterized using XRD, FESEM, and impedance spectroscopy. The maximum conductivity (100 °C) is found to be 5 × 10−5 Ω−1 cm−1 for an LTP-glass-ceramic composite, which is significantly higher than that of LTP. Impedance spectroscopy, electronic conductivity, and cyclic voltammetry scans strongly suggest simultaneous transport of ions and electrons. These composites exhibit thermal stability up to ~250 °C. These mixed conductors are found to be potential candidates as electrode/cathode materials in all-solid-state Li+ ion batteries.



中文翻译:

用于阴极的离子-电子Li + -NASICON混合玻璃陶瓷纳米复合材料的合成

提出了制备混合离子-电子(MIE)玻璃陶瓷的新途径。玻璃陶瓷纳米复合材料是通过在外部分散MIE玻璃制备的。[Li 2 O] x- [V 2 O 5 -P 2 O 5 ] 100-  x(其中x  = 10和20 wt%,并且V 2 O 5和P 2 O 5的比率保持为9: 1和3:1)在NASICON结构的LiTi 2(PO 43中(LTP)基质使用机械研磨辅助合成路线。在对这些玻璃陶瓷复合材料进行适当的烧结温度后,使用XRD,FESEM和阻抗光谱对样品进行结构和电学表征。最大电导率(100℃)被发现是5×10 -5  Ω -1 厘米-1为LTP -玻璃-陶瓷复合物,其比LTP的显著更高。阻抗谱,电子电导率和循环伏安法扫描强烈建议同时传输离子和电子。这些复合材料在高达约250°C的温度下具有热稳定性。发现这些混合导体是全固态Li +离子电池中作为电极/阴极材料的潜在候选材料。

更新日期:2020-06-13
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