High-Entropy Sn0.8(Co0.2Mg0.2Mn0.2Ni0.2Zn0.2)2.2O4 Conversion- Alloying Anode Material for Li-Ion Cells: Altered Lithium Storage Mechanism, Activation of Mg, and Origins of the Improved Cycling Stability

被引:22
作者
Mozdzierz, Maciej [1 ]
Swierczek, Konrad [1 ,7 ]
Dabrowa, Juliusz [2 ]
Gajewska, Marta [3 ]
Hanc, Anna [1 ]
Feng, Zhenhe [4 ]
Cieslak, Jakub [5 ]
Kadziolka-Gawel, Mariola [6 ]
Plotek, Justyna [1 ]
Marzec, Mateusz [3 ]
Kulka, Andrzej [1 ]
机构
[1] AGH Univ Sci & Technol, Fac Energy & Fuels, PL-30059 Krakow, Poland
[2] AGH Univ Sci & Technol, Fac Mat Sci & Ceram, PL-30059 Krakow, Poland
[3] AGH Univ Sci & Technol, Acad Ctr Mat & Nanotechnol, PL-30059 Krakow, Poland
[4] Shanghai Inst Space Power Sources, State Key Lab Space Power Sources Technol, Shanghai 200245, Peoples R China
[5] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland
[6] Univ Silesia, Inst Phys, PL-41500 Chorzow, Poland
[7] AGH Univ Sci & Technol, AGH Ctr Energy, PL-30054 Krakow, Poland
关键词
Li-ion cells; anodes; conversion and alloying reactions; high-entropy oxides; cycling stability; Li-storage mechanisms; X-RAY-ABSORPTION; OXIDE; LITHIATION; NANOPARTICLES; SPECTROSCOPY; EXPLORATION; ELECTRODES; FILMS;
D O I
10.1021/acsami.2c11038
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Benefits emerging from applying high-entropy ceramics in Li-ion technology are already well-documented in a growing number of papers. However, an intriguing question may be formulated: how can the multicomponent solid solution-type material ensure stable electrochemical performance? Utilizing an example of nonequimolar Sn-based Sn-0.8(Co0.2Mg0.2Mn0.2Ni0.2Zn0.2)(2.2)O-4 high-entropy spinel oxide, we provide a comprehensive model explaining the observed very good cyclability. The material exhibits a high specific capacity above 600 mAh g(-1) under a specific current of 50 mA g(-1) and excellent capacity retention near 100% after 500 cycles under 200 mA g(-1). The stability originates from the conversion-alloying reversible reactivity of the amorphous matrix, which forms during the first lithiation from the initial high-entropy structure, and preserves the high level of cation disorder at the atomic scale. In the altered Li-storage mechanism in relation to the simple oxides, the unwanted aggregated metallic grains are not exsolved from the anode and therefore do not form highly lithiated phases characterized by large volumetric changes. Also, the electrochemical activity of Mg from the oxide matrix can be clearly observed. Because the studied compound was prepared by a conventional solid-state route, implementation of the presented approach is facile and appears usable for any oxide anode material containing a high-entropy mixture of elements.
引用
收藏
页码:42057 / 42070
页数:14
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