期刊
PROCESSES
卷 10, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/pr10010049
关键词
lithium-ion battery; spinel-type high entropy oxide; phase transformation; in-situ X-ray diffraction
资金
- National Natural Science Foundation of China [51831009, 52071144, 51621001, 51822104]
In this study, a six-component high entropy oxide anode material was prepared and exhibited excellent electrochemical performance. Through in-situ and ex-situ characterization techniques, important findings about the lithium storage behavior and phase change mechanism were obtained, providing new insights for better understanding of anode materials.
Recently, high entropy oxides (HEO) with special stabilization effects have been widely investigated as new anode materials for lithium-ion batteries. However, the lithium storage mechanism of HEO is still under debate. In this work, we applied a modified solution combustion synthesis method with a subsequent ball milling refinement process to prepare a six-component (FeNiCrMnMgAl)(3)O-4 spinel high entropy oxide (6-SHEO). The novel 6-SHEO anode features outstanding electrochemical performance, enabling a stable capacity of 657 mAh g(-1) at a current rate of 0.2 A g(-1) after 200 cycles, and good high-rate capability with 350 mAh g(-1) even at 4 A g(-1). In addition, the lithium storage behavior of this 6-SHEO anode was explored in detail through in-situ XRD and ex-situ TEM approaches. Surprisingly, a reversible spinel to rock salt phase transition behavior and spinel phase residue phenomenon was firstly observed by this route. Furthermore, for better understanding of the phase change behavior in this 6-SHEO anode, a high-energy ball milling approach was applied to induce a similar spinel to rock salt phase transformation for the first time, which generates fresh insight into the mechanism of the phase change behavior in this 6-SHEO anode.
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