Enhanced low temperature electrochemical properties of Li₃V₂(PO₄)₃/C modified by a mixed conductive network of Ti₃SiC₂ and C

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• 作者：Dandan Sun^a ; Chen Wu^a ; Ruisong Guo^a ; ^{rsguo@tju.edu.cn} ; Zhichao Liu^a ; Dong Xie^a ; Mei Zheng^a ; Baoyu Wang^a ; Jianhong Peng^b ; ^{pjhhj@sohu.com} ; Hong Jiang^c
• 关键词：Lithium-ion battery ; Ti3SiC2 ; Low temperature ; Electrochemical performance ; Li3V2(PO4)3
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：2791-2800
• 全文大小：2796 K
• 卷排序：43

文摘

Li3V2(PO4)3/C is prepared by an improved sol-gel method and then modified with various amounts of Ti3SiC2 by a suspension mixing process. This process allows Li3V2(PO4)3/C platelets to attach on the surface of nanolaminated Ti3SiC2 particles, creating an integrated conductive network. Such superior structure brings a significant improvement in initial discharge capacity, rate performance and cycle ability of Ti3SiC2-modified samples over Li3V2(PO4)3/C at low temperatures. At both 0 and −20 °C, the 4 wt% Ti3SiC2-modified sample (T-4) shows the best electrochemical performance between 3.0 and 4.8 V. Especially, it delivers a reversible capacity of 80.8 mAh g−1 in 50 cycles at 2 C under −20 °C, while the discharge capacity of the pristine sample is only 10.7 mAh g−1 under the same conditions.