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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
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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Embargo End Date 2022-09-30
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