Rapid preparation and performances of garnet electrolyte with sintering aids for solid-state Li–S battery
| Autor: | Lingguang Yi, Yongfang Li, Kaili Luo, Li Yang, Xiyuan Tao, Peng Zeng, Zhigao Luo, Xiao Huang, Lei Liu, Qiushi Dai, Changfei Zou, Xianyou Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Battery (electricity) Materials science Process Chemistry and Technology Sintering 02 engineering and technology Electrolyte Conductivity 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode chemistry.chemical_compound Chemical engineering chemistry visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic 0210 nano-technology Polysulfide |
| Zdroj: | Ceramics International. 47:18196-18204 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.03.138 |
| Popis: | Lithium-sulfur (Li–S) batteries are attractive due to their high theoretical energy density. However, conventional Li–S batteries with liquid electrolytes undergo polysulfide shuttle-effect and lithium dendrite formation during charge/discharge process, leading to poor electrochemical performance and safety issues. Garnet type Li7La3Zr2O12 (LLZO) solid-state electrolyte (SSE) restricts the penetration of polysulfides and exhibits high ionic conductivity at room temperature (RT). Herein, Li6.5La3Zr1.5Nb0.5O12 (LLZNO) ceramic electrolyte using Li3PO4 (LPO) as sintering aids (LLZNO-LPO) is prepared by the rapid sintering method and is applied to construct a shuttle-effect free solid-state Li–S battery. The SSE displays high conductive pure cubic-LLZO phase; during the rapid sintering, LPO melts and junctions the voids between the grains, thus improves Li+ conductivity. As a result, the LLZNO-LPO ceramic electrolyte with Li+ conductivity of 4.3 × 10−4 S cm−1 and high critical current density (CCD) of 1.2 mA cm−2 is obtained at RT. The Li–S solid-state battery which utilizes LLZNO-LPO ceramic electrolyte can deliver an initial discharge capacity of 943 mA h·g−1 and 602 mA h·g−1 retention after 60 cycles. In the same time, the initial coulombic efficiency is as high as 99.5%, indicating that the SSE can effectively block the polysulfide shuttle towards the Li anode and fulfill a shuttle-free Li–S battery. |
| Databáze: | OpenAIRE |
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