Wide-Temperature Electrolytes for Lithium-Ion Batteries
| Autor: | Chongmin Wang, Wu Xu, Jianming Zheng, Qiuyan Li, Shuhong Jiao, Kang Xu, Ji-Guang Zhang, Michael S. Ding, Langli Luo, Samuel Cartmell |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Inorganic chemistry chemistry.chemical_element Salt (chemistry) 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Lithium-ion battery 0104 chemical sciences Freezing point chemistry.chemical_compound chemistry Propylene carbonate Ionic conductivity General Materials Science Lithium 0210 nano-technology Ethylene carbonate |
| Zdroj: | ACS applied materialsinterfaces. 9(22) |
| ISSN: | 1944-8252 |
| Popis: | Formulating electrolytes with solvents of low freezing points and high dielectric constants is a direct approach to extend the service-temperature range of lithium (Li)-ion batteries (LIBs). In this study, we report such wide-temperature electrolyte formulations by optimizing the ethylene carbonate (EC) content in the ternary solvent system of EC, propylene carbonate (PC), and ethyl methyl carbonate (EMC) with LiPF6 salt and CsPF6 additive. An extended service-temperature range from −40 to 60 °C was obtained in LIBs with lithium nickel cobalt aluminum oxide (LiNi0.80Co0.15Al0.05O2, NCA) as cathode and graphite as anode. The discharge capacities at low temperatures and the cycle life at room temperature and elevated temperatures were systematically investigated together with the ionic conductivity and phase-transition behaviors. The most promising electrolyte formulation was identified as 1.0 M LiPF6 in EC–PC–EMC (1:1:8 by wt) with 0.05 M CsPF6, which was demonstrated in both coin cells of graphite∥NCA and... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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