4.8 Article

Yttrium stabilized argyrodite solid electrolyte with enhanced ionic conductivity and interfacial stability for all-solid-state batteries

Journal

JOURNAL OF POWER SOURCES
Volume 543, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231846

Keywords

Argyrodite Li6PS5Cl; All-solid-state battery; Yttrium ion doping; Ionic conductivity; Interface stability

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By doping yttrium ion (Y3+) into the argyrodite Li6PS5Cl (LPSCl) electrolyte, the Li (+) mobility and interface stability to Li anode are enhanced, leading to high ionic conductivity and improved electrochemical interfacial stability. The Y-doped LPSCl electrolyte shows great potential for practical applications of all-solid-state lithium batteries.
The inferior electrochemical stability towards Li anode and relatively low ionic conductivity at room temperature of argyrodite Li6PS5Cl (LPSCl) electrolytes are the intractable challenges for all-solid-state lithium batteries (ASSLBs). Herein, in order to fully address the aforementioned issues, yttrium ion (Y3+) employed as dopant is designed to substitute for P5+ in LPSCl to boost the Li (+) mobility in electrolyte, as well as to ameliorate the interface stability to Li anode. By introducing appropriate Y3+ dopant, the optimized LPSCl-0.02Y electrolyte exhibits high ionic conductivity of 3.3 x 10(-3) S cm(-1) at 25 degrees C, which is 2 times higher than that of the pristine LPSCl (1.5 x 10(-3) S cm(-1)). Benefitting from the high ionic conductivity, LPSCl-0.02Y is endowed with superior inhibition ability of Li dendrite nucleation and growth from Li anode, thereby significantly enhancing the (electro)chemical interfacial stability. Impressively, LiNi0.8Co0.1Mn0.1O2/Li cell with LPSCl-0.02Y electrolyte delivers high initial discharge capacity (165 mA h g(-1) at 0.05C), robust cycling stability (93 mA h g(-1) after 100 cycles) and remarkable rate capability (130 mA h g(-1) at 0.2C). This rationally designed Y-doped LPSCl electrolyte is highly expected to pave the road for the practical application of ASSLBs, and to deepen the understanding of aliovalent substitution mechanism.

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