Abstract:Aliovalent doping of solid electrolytes with the intention of increase the concentration of chargecarrying mobile defects is a common strategy for enhancing their ionic conductivities. For the antiperovskite lithium-ion solid electrolyte Li 3 OCl, both supervalent (donor) and subvalent (acceptor) doping schemes have previously been proposed. The effectiveness of these doping schemes depends on two conditions: first, that aliovalent doping promotes the formation of mobile lithium vacancies or interstitials rath… Show more
“…the reverse reaction of Frenkel pair formation) at lower temperatures. 122,123 Two variations of the "frozen" approach were applied. The former approach only allowed V Li and Li i concentrations to vary, whereas the latter also allowed Li Mn and Li Ni concentrations to change.…”
High-voltage spinel LiMn1.5Ni0.5O4 (LMNO) can exist in a Mn/Ni ordered P4332 or disordered Fd-3m arrangement with a majority of literature studies reporting improved electrochemical performance for the disordered phase. Through...
“…the reverse reaction of Frenkel pair formation) at lower temperatures. 122,123 Two variations of the "frozen" approach were applied. The former approach only allowed V Li and Li i concentrations to vary, whereas the latter also allowed Li Mn and Li Ni concentrations to change.…”
High-voltage spinel LiMn1.5Ni0.5O4 (LMNO) can exist in a Mn/Ni ordered P4332 or disordered Fd-3m arrangement with a majority of literature studies reporting improved electrochemical performance for the disordered phase. Through...
“…43,44 Indeed, several computational studies have examined the roles of crystallographic defects -in particular Li + vacancies and interstitials -in facilitating Li + conduction in Li 3 OCl. 15,[21][22][23][24][45][46][47][48][49][50] These defects can be created by adjusting the ratio of Li 2 O and LiCl precursors used in synthesis or by adding aliovalent dopant ions such as Mg 2+ . A band gap of 3.7-4.4 eV 44 has been predicted for grain boundaries in Li 3 OCl compared to the 1-3 eV band gap measured for 50% of grain boundaries in Li 7 La 3 Zr 2 O 12 ; 51 in both cases the grain boundary band gap is thought to be smaller than that of the bulk material, limiting the electrochemical stability of polycrystalline samples.…”
Several attempts to synthesize Li3OCl – a lithium-rich antiperovskite compound envisaged as a potential solid electrolyte material for lithium metal batteries – have been reported, but few have yielded convincing...
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