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Garnet-Type Fast Li-Ion Conductors with High Ionic Conductivities for All-Solid-State Batteries.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2017 Apr 12; Vol. 9 (14), pp. 12461-12468. Date of Electronic Publication: 2017 Mar 31. - Publication Year :
- 2017
-
Abstract
- All-solid-state Li-ion batteries with metallic Li anodes and solid electrolytes could offer superior energy density and safety over conventional Li-ion batteries. However, compared with organic liquid electrolytes, the low conductivity of solid electrolytes and large electrolyte/electrode interfacial resistance impede their practical application. Garnet-type Li-ion conducting oxides are among the most promising electrolytes for all-solid-state Li-ion batteries. In this work, the large-radius Rb is doped at the La site of cubic Li <subscript>6.10</subscript> Ga <subscript>0.30</subscript> La <subscript>3</subscript> Zr <subscript>2</subscript> O <subscript>12</subscript> to enhance the Li-ion conductivity for the first time. The Li <subscript>6.20</subscript> Ga <subscript>0.30</subscript> La <subscript>2.95</subscript> Rb <subscript>0.05</subscript> Zr <subscript>2</subscript> O <subscript>12</subscript> electrolyte exhibits a Li-ion conductivity of 1.62 mS cm <superscript>-1</superscript> at room temperature, which is the highest conductivity reported until now. All-solid-state Li-ion batteries are constructed from the electrolyte, metallic Li anode, and LiFePO <subscript>4</subscript> active cathode. The addition of Li(CF <subscript>3</subscript> SO <subscript>2</subscript> ) <subscript>2</subscript> N electrolytic salt in the cathode effectively reduces the interfacial resistance, allowing for a high initial discharge capacity of 152 mAh g <superscript>-1</superscript> and good cycling stability with 110 mAh g <superscript>-1</superscript> retained after 20 cycles at a charge/discharge rate of 0.05 C at 60 °C.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 9
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 28332828
- Full Text :
- https://doi.org/10.1021/acsami.7b00614