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http://hdl.handle.net/10397/89293
| Title: | Interfacial kinetics induced phase separation enhancing low-temperature performance of lithium-ion batteries | Authors: | Li, K Lin, D Huang, H Liu, D Li, B Shi, SQ Kang, F Zhang, TY Zhou, L |
Issue Date: | Sep-2020 | Source: | Nano energy, Sept. 2020, v. 75, 104977 | Abstract: | Understanding the temperature dependence of phase transitions occurred in electrode materials is crucial for improving the low-temperature performance of Li-ion batteries. In this work, we find an unusual temperature dependence in the phase transition of TiO2 nanoparticles on dynamic Li+ intercalation, with a decrease in temperature resulting in the formation of a supersaturated solid solution phase. Kinetic analyses reveal that Li redistribution is facilitated at high temperature while limited at low temperature. This difference manifests as a thermodynamically-controlled phase separation at high temperature and a kinetically-controlled formation of a supersaturated solid solution phase at low temperature. Facilitating the phase separation by enhancing the interfacial kinetics proves effective to improve the low-temperature performance. This study provides a comprehensive and in-depth understanding of the temperature dependence of the lithiation-induced phase transition, which has important implications for the development of the next generation of all-climate rechargeable batteries. | Keywords: | Interfacial kinetics Lithiation Phase transitions Raman spectroscopy Supersaturated solid solution phase Temperature dependence |
Publisher: | Elsevier | Journal: | Nano energy | ISSN: | 2211-2855 | EISSN: | 2211-3282 | DOI: | 10.1016/j.nanoen.2020.104977 |
| Appears in Collections: | Journal/Magazine Article |
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