We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Correlation Between Li‐Fe Anti‐Site and Memory Effect of LiFePO<sub>4</sub> in Li‐Ion Batteries.
- Authors
Lu, Xingguang; Ren, Yuanyuan; Chen, Daming; Guo, Xiaolong; Li, De; Chen, Yong
- Abstract
In Li‐ion batteries, the origin of memory effect in Al‐doped Li4Ti5O12 has been revealed as the reversible Al‐ion switching between 8a and 16c sites in the spinel structure, but it is still not clear about that for olivine LiFePO4, which is one of the most important cathode materials. In this work, a series of Na‐doped and Ti‐doped LiFePO4 are prepared in a high‐temperature solid‐state method, electrochemically investigated in Li‐ion batteries and characterized by X‐Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Magic‐Angle‐Spinning Nuclear Magnetic Resonance (MAS NMR). Compared with non‐doped LiFePO4, the Ti doping can simultaneously suppress the memory effect and the Li−Fe anti‐site, while they are simultaneously enhanced by the Na doping. Meanwhile, the Ti doping improves the electrochemical performance of LiFePO4, opposite to the Na doping. Accordingly, a schematic diagram of phase transition is proposed to interpret the memory effect of LiFePO4, in which the memory effect is attributed to the defect of Li−Fe anti‐site.
- Subjects
LITHIUM-ion batteries; FOURIER transform infrared spectroscopy; NUCLEAR magnetic resonance; PHASE transitions; MEMORY; ANTISITE defects
- Publication
Chemistry - An Asian Journal, 2024, Vol 19, Issue 14, p1
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.202400181