Nido‐Hydroborate‐Based Electrolytes for All‐Solid‐State Lithium Batteries
| Autor: | Corsin Battaglia, Zbigniew Łodziana, Daniel Rentsch, Radovan Černý, Seyedhosein Payandeh, Laurent Bigler, Ryo Asakura, Arndt Remhof |
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| Přispěvatelé: | University of Zurich, Payandeh, SeyedHosein, Łodziana, Zbigniew, Remhof, Arndt |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
10120 Department of Chemistry
Materials science 3104 Condensed Matter Physics General Chemical Engineering Inorganic chemistry chemistry.chemical_element Ionic bonding 1600 General Chemistry ddc:500.2 02 engineering and technology Electrolyte Lithium Conductivity Overpotential 010402 general chemistry Electrochemistry 01 natural sciences 7. Clean energy Biomaterials Batteries tout solides 540 Chemistry Fast ion conductor Electronic Optical and Magnetic Materials Electrolyte solid 021001 nanoscience & nanotechnology Condensed Matter Physics 2500 General Materials Science 0104 chemical sciences Electronic Optical and Magnetic Materials Anode chemistry 0210 nano-technology |
| Zdroj: | Advanced Functional Materials, Vol. 31, No 18 (2021) P. 2010046 |
| ISSN: | 1616-301X |
| Popis: | Hydroborate‐based solid electrolytes have recently been successfully employed in high voltage, room temperature all‐solid‐state sodium batteries. The transfer to analogous lithium systems has failed up to now due to the lower conductivity of the corresponding lithium compounds and their high cost. Here LiB11H14 nido‐hydroborate as a cost‐effective building block and its high‐purity synthesis is introduced. The crystal structures of anhydrous LiB11H14 as well as of LiB11H14‐based mixed‐anion solid electrolytes are solved and high ionic conductivities of 1.1 × 10−4 S cm−1 for Li2(B11H14)(CB11H12) and 1.1 × 10−3 S cm−1 for Li3(B11H14)(CB9H10)2 are obtained, respectively. LiB11H14 exhibits an oxidative stability limit of 2.6 V versus Li+/Li and the proposed decomposition products are discussed based on density functional theory calculations. Strategies are discussed to improve the stability of these compounds by modifying the chemical structure of the nido‐hydroborate cage. Galvanostatic cycling in symmetric cells with two lithium metal electrodes shows a small overpotential increase from 22.5 to 30 mV after 620 h (up to 0.5 mAh cm−2), demonstrating that the electrolyte is compatible with metallic anodes. Finally, the Li2(B11H14)(CB11H12) electrolyte is employed in a proof‐of‐concept half cell with a TiS2 cathode with a capacity retention of 82% after 150 cycles at C/5. |
| Databáze: | OpenAIRE |
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