Meisheng Han, Kunxiong Zheng, Jie Liu, Zhiyu Zou, Yongbiao Mu, Hengyuan Hu, Fenghua Yu, Wenjia Li, Lei Wei, Lin Zeng and Tianshou Zhao
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引用次数: 0
Abstract
Conversion-type transition-metal compounds (C-TMCs) are widely used as lithium-ion battery (LIB) anodes due to their high theoretical capacity. However, a significant discrepancy in lithium storage capacity is observed across a wide range of temperatures, and a comprehensive understanding of the underlying mechanism remains elusive. Herein, we propose a methodology to clarify the capacity discrepancy mechanisms by choosing the Fe1−xS anode as a representation. Specifically, we demonstrate lithium storage in three stages of Fe1−xS across a wide temperature range, involving insertion, conversion, and space charge. Furthermore, we reveal that the capacity discrepancy mechanisms of Fe1−xS across a wide temperature range are due to the differences in the amount of spin-polarized electrons that are injected into Fe, which induces the storage of different amounts of lithium ions into Li2S during the space charge lithium storage by in situ magnetometry as a dominant technology. Higher operational temperatures of the batteries benefit from more storage of ions and electrons in Li2S and Fe, respectively. Our work clarifies the importance of space charge in the improvement of the capacity of C-TMCs in a wide temperature range, which can guide the development of high-capacity anodes that can be used in wide-temperature-range LIBs.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.