期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 14, 页码 12461-12468出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b00614
关键词
solid electrolyte; LLZO; garnet; lithium-ion conductivity; all-solid-state lithium batteries
资金
- National Natural Science Foundation of China [51672096]
- Australian Research Council [FT160100251]
- Australian Research Council [FT160100251] Funding Source: Australian Research Council
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 Li6.10Ga0.30La3Zr2O12 to enhance the Li-ion conductivity for the first time. The Li6.20Ga0.30La2.95Rb0.05Zr2O12 electrolyte exhibits a Li-ion conductivity of 1.62 mS cm(-1) 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 LiFePO4 active cathode. The addition of Li(CF3SO2)(2)N electrolytic salt in the cathode effectively reduces the interfacial resistance, allowing for a high initial discharge capacity of 152 mAh g(-1) and good cycling stability with 110 mAh g(-1) retained after 20 cycles at a charge/discharge rate of 0.05 C at 60 degrees C.
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