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Title: Role of ligands in the stability of B n X n and CB n-1 X n (n = 5–10; X = H, F, CN) and their potential as building blocks of electrolytes in lithium ion batteries

Journal Article · · Physical Chemistry Chemical Physics. PCCP (Print)
DOI:https://doi.org/10.1039/c7cp02642k· OSTI ID:1492404
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [2]
  1. School of Physical Science and Technology; Southwest University; Chongqing 400715; China; Department of Physics Virginia Commonwealth University Richmond
  2. Department of Physics Virginia Commonwealth University Richmond; Virginia 23284; USA

Stabilizing small multiply charged negative ions in the gas phase has been of considerable interest in recent years. B12H122- is one of the most well-known dianions which is stable against auto-detachment of its second electron in the gas phase by 0.9 eV, whereas BnHn2- with n < 12 is unstable. Using density functional theory, we have examined systematically the role of ligands in stabilizing smaller mono- and di-anions of BnXn and CBn-1Xn (n = 5–10; X = H, F, CN). We show that the stability of the negative ions of these complexes increases with the electron affinity of the ligand and Bn(CN)n2- can even be stable against electron emission for n ≥ 5. We also show that CBn-1(CN)n2- is stable against electron emission for n ≥ 8, even though these moieties contain one electron more than needed to satisfy the Wade–Mingos rule. We have examined the potential of these stable negative ions as building blocks of electrolytes in Li-ion batteries. By calculating the binding energies between the CBn-1Xn1-,2- and Li+, we find that some of these clusters may even outperform CB11H12- as electrolytes in metal-ion batteries.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
DOE Contract Number:
FG02-96ER45579; AC02-05CH11231
OSTI ID:
1492404
Journal Information:
Physical Chemistry Chemical Physics. PCCP (Print), Vol. 19, Issue 27; ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

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