In:
Journal of The Electrochemical Society, The Electrochemical Society, Vol. 169, No. 12 ( 2022-12-01), p. 120507-
Abstract:
The one-dimensional Li + diffusion channel is the key factor restricting the rate performance and low-temperature performance of the LFP/C composites. By artificially creating a certain content of antisite defects, the Li + in the LFP material can be diffused two-dimensionally. The LFP/C composites synthesized by the carbothermic reduction method at 700 °C have 3.77% Fe-Li antisite defects, showing higher rate performance, cycle performance, and discharge-specific capacity. The CV, EIS, and GITT tests show that the Li + diffusion coefficient of LFP is the highest when the content of Fe-Li antisite defects is 3.77%. DFT calculation shows that the single pair of Fe-Li antisite defects is conducive to the two-dimensional diffusion of Li + , while the continuous two pairs of antisite defects greatly inhibit the diffusion of Li + along the original [010] crystal direction.
Type of Medium:
Online Resource
ISSN:
0013-4651
,
1945-7111
DOI:
10.1149/1945-7111/aca365
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2022
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