Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7991638 | Journal of Alloys and Compounds | 2018 | 8 Pages |
Abstract
Tavorite-like structure LiFePO4F has been recently studied as potential alternative cathode materials for lithium-ion batteries due to its outstanding structural stability, abundant resources and remarkable safety. However, its poor electronic conductivity and lithium-ion diffusion coefficient leads to the unsatisfactory cycling stability and rate capabilities of LiFePO4F. Herein, Ag decorated LiFePO4F nanospheres have been synthesized for the first time via a precipitation method with in-situ reduction of Ag+, simultaneously improving electronic conductivity and lithium-ion diffusion coefficient. The Ag nanoparticles with size of â¼10â¯nm are in-situ grown on the surface of LiFePO4F nanospheres with impressive electrochemical performance. It delivers a high discharge capacity of 148.7â¯mAh gâ1 (very close to the theoretical capacity of 152â¯mAh gâ1) at 0.1â¯C. It is worth mentioning that the Ag-decorated LiFePO4F nanospheres reveal superior cycling stability. The initial discharge capacities of Ag-decorated LiFePO4F reaches up to 120.3â¯mAh·gâ1 at 0.5â¯C, and the capacity retention is as high as 96.1% after 300 cycles, which is remarkable higher than that of pure LiFePO4F nanospheres with initial discharge capacity of 110.2â¯mAh·gâ1 and capacity retention of 83.1% after 300 cycles. Furthermore, the Ag-decorated LiFePO4F displays the average discharge potential loss of only 0.7% which is lower than pure LiFePO4F of 4.7% after 300 cycles, and the corresponding specific energy retention ratio of 95.5% which is higher than that of 80.1%.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Yuanyuan Zhang, Tu'an Lv, Ping Gao, Hongbo Shu, Xiukang Yang, Qianqian Liang, Li Liu, Xianyou Wang,