Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7726310 | Journal of Power Sources | 2018 | 6 Pages |
Abstract
Mn-rich olivine LiFe0.3Mn0.7PO4 is homogenously encapsulated by an â¼3-nm-thick conductive nanolayer composed of the glassy lithium fluorophosphate through simple non-stoichiometric synthesis using additives of small amounts of LiF and a phosphorus source. The coating of the glassy lithium fluorophosphate nanolayer is clearly verified using transmission electron microscopy and X-ray photoelectron spectroscopy. It enables significant decrease in charge transfer resistance of LiFe0.3Mn0.7PO4 and improvement of its sluggish Li diffusion. At a rate of 10C, the LiFe0.3Mn0.7PO4 encapsulated by conductive glassy lithium fluorophosphate (LiFe0.3Mn0.7PO4-GLFP) electrode delivers a capacity of â¼130Â mAh gâ1, which is â¼77% of its theoretical capacity (â¼170Â mAh gâ1) and â¼1.5 times higher than that of the pristine counterpart at 10C. Furthermore, LiFe0.3Mn0.7PO4-GLFP achieves outstanding cycle stability (â¼75% retention of its initial capacity over 500 cycles at 1C). The proposed olivine LiFe0.3Mn0.7PO4-GLFP battery is thus expected to be a promising candidate for large-scale energy storage applications.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jongsoon Kim, Hyungsub Kim, Seung-Taek Myung, Jung-Keun Yoo, Seongsu Lee,