Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5458008 | Journal of Alloys and Compounds | 2018 | 7 Pages |
Abstract
In this paper, LiTi2-xSnx(PO4)3/C (x = 0, 0.2, 0.3, 0.4) composites were synthesized by sol-gel approach, and were investigated as anodes for aqueous lithium ion battery. Sn doping with proper content has no obvious influence on phase and morphology of the composite, while excessive dosage of Sn can affect its crystal structure. Sn doping can enhance the electrochemical properties of LiTi2(PO4)3/C (LC). Among LiTi2-xSnx(PO4)3/C composites, LiTi1.7Sn0.3(PO4)3/C (LC-Sn-0.3) demonstrates the best electrochemical properties. Most importantly, the rate performance of LC can be improved dramatically by Sn doping on Ti sites. LC-Sn-0.3 delivers a discharge capacity of 118.9, 115.3, and 104.2 mAh gâ1 at 0.2, 6, and 20 C (1 C = 150 mA gâ1), respectively, with significant increase of 15.2, 27.4, and 41.9 mAh gâ1 compare with LC. In addition, LC-Sn-0.3 exhibits superior cycling performance. The capacity retention for LC-Sn-0.3 can keep 76.8% after 1000 cycles at relatively high rate of 10 C, while only 51.7% of initial discharge capacity is retained for LC. Our study reveals that Sn doping on Ti sites is an efficient and facile method to improve the performance of LiTi2(PO4)3/C composite for aqueous lithium ion battery.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zhangxing He, Yingqiao Jiang, Jing Zhu, Yuehua Li, Zhen Jiang, Huizhu Zhou, Wei Meng, Ling Wang, Lei Dai,