Journal
CHEMISTRY OF MATERIALS
Volume 29, Issue 6, Pages 2474-2484Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b04049
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0012118]
- National Science Foundation [ACI-1053575]
- U.S. Department of Energy (DOE) [DE-SC0012118] Funding Source: U.S. Department of Energy (DOE)
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We report two novel, earth-abundant lithium superionic conductors, Li3Y(PS4)(2) and Li5PS4Cl2, that are predicted to satisfy the necessary combination of good phase stability, high Li+ conductivity, wide band gap and good electrochemical stability for solid electrolyte applications in all solid-state rechargeable lithium-ion batteries. These candidates were identified from a high-throughput first-principles screening of the Li-P-S ternary and Li-M-P-S (where M is a non-redox-active element) quaternary chemical spaces, including candidates obtained by replacing Ag with Li in the Ag-P-S and Ag-M-P-S chemical spaces. An efficient tiered screening strategy was developed that combines topological analysis with ab initio molecular dynamics simulations to exclude rapidly candidates unlikely to satisfy the stringent conductivity requirements of lithium superionic conductors. In particular, we find Li3Y(PS4)(2) to be an extremely promising candidate exhibiting a room temperature Li+ conductivity of 2.16 mS/cm, which can be increased multifold to 7.14 and 5.25 mS/cm via aliovalent doping with Ca2+ and Zr4+, respectively. More critically, we show that the phase and electrochemical stability of Li3Y(PS4)(2) is expected to be better than current state-of-the-art lithium superionic conductors.
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