Factors affecting Li mobility in spinel LiMn2O4—A first-principles study by GGA and GGA+U methods
The structural changes and voltages of LiMn{sub 2}O{sub 4} spinel as a function of lithium content were investigated with density functional theory (DFT) in the generalized gradient approximation (GGA) and in the GGA with Hubbard U correction (GGA+U). The GGA+U approximation can distinguish the charge separation between Mn{sup 3+} and Mn{sup 4+}, which GGA fails to capture. Therefore with this method the effects of local environments on Li diffusion activation energy barriers in the Li-rich phase could be systematically investigated. Our results showed that the different valences states of Mn ions and their arrangement surrounding the lithium ions have a profound effect on the activation barrier of lithium diffusion in the spinel structure.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- DOE Contract Number:
- SC0001294
- OSTI ID:
- 1064704
- Journal Information:
- Journal of Power Sources, Vol. 195, Issue 15; Related Information: NECCES partners with Stony Brook University (lead); Argonne National Laboratory; Binghamton University; Brookhaven National University; University of California, San Diego; University of Cambridge, UK; Lawrence Berkeley National Laboratory; Massachusetts Institute of Technology; University of Michigan; Rutgers University; ISSN 0378-7753
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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