B-doped Li3V2(PO4)3/C cathode material with high rate capability for lithium-ion batteries
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- 作者：Jianbo Liu jianbo_liu@yulinu.edu.cn
- 关键词：Lithium vanadium phosphate ; Lithium-ion batteries ; Cathode material ; B-Doping
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：1 February 2017
- 年：2017
- 卷：43
- 期：2
- 页码：2573-2578
- 全文大小：1330 K
- 卷排序：43
文摘
The Li3V2(P1-xBxO4)3/C (x=0, 0.01, 0.05, 0.07, 0.10, 0.15 and 0.20) cathode materials for lithium ion batteries are synthesized by solid state method. XRD results indicate that an appropriate addition of B does not change the lattice structure of Li3V2(PO4)3/C. SEM images show that the doping of B affects the morphology of samples obviously, and an appropriate addition of B can decrease the particle size. Significant improvements in electrochemical properties are achieved in the B-doped Li3V2(PO4)3/C composites when compared with the pristine one. In the potential range of 3.0–4.8 V, the Li3V2(P0.95B0.05O4)3/C delivers a high initial discharge capacity of 190.7 mAh g−1 at 0.1 C and an excellent rate-capability with a discharge capacity about 89.5 mAh g−1 at 15 C rate. The Li3V2(P0.95B0.05O4)3/C also shows a favorable cycle performance with an initial discharge capacity of 159.5 mAh g−1 at 5 C and can remain 114.4 mAh g−1 after 200 cycles. The improved electrochemical performance of the B-doped Li3V2(PO4)3/C can be attributed to the B doping in P sites, which can decrease the particle size, lower the charge transfer resistance and improve the structural stability.