Garnet-Type Fast Li-Ion Conductors with High Ionic Conductivities for All-Solid-State Batteries.
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 Li6.10Ga0.30La3Zr2O12to enhance the Li-ion conductivity for the first time. The Li6.20Ga0.30La2.95Rb0.05Zr2O12electrolyte exhibits a Li-ion conductivity of 1.62 mS cm-1at 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 LiFePO4active cathode. The addition of Li(CF3SO2)2N electrolytic salt in the cathode effectively reduces the interfacial resistance, allowing for a high initial discharge capacity of 152 mAh g-1and good cycling stability with 110 mAh g-1retained after 20 cycles at a charge/discharge rate of 0.05 C at 60 °C.
Laboratory of Solid State Ionics, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China.
Jian-Fang
JF
Wu
Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation , Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia.|Institute for Superconducting & Electronic Materials, Faculty of Engineering, University of Wollongong , Wollongong, New South Wales 2522, Australia.
Wei Kong
http://orcid.org/0000-0002-5118-3885
WK
Pang
Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation , Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia.|Institute for Superconducting & Electronic Materials, Faculty of Engineering, University of Wollongong , Wollongong, New South Wales 2522, Australia.
Vanessa K
VK
Peterson
Laboratory of Solid State Ionics, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China.
Lu
L
Wei
Laboratory of Solid State Ionics, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China.
Xin
http://orcid.org/0000-0003-1546-8119
X
Guo
LLZO; all-solid-state lithium batteries; garnet; lithium-ion conductivity; solid electrolyte