期刊
CHEMICAL ENGINEERING JOURNAL
卷 399, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125627
关键词
Long lifespan; Aqueous battery; Electrochemical mechanism; 3D assembly; Flexible electronic
资金
- National Nature Science Foundations of China [51873083, 61974089]
- Nature Science Foundations of Jiangsu Province [BK20190976]
- University Natural Science Research Project of Jiangsu Province [19KJB430017]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2018-4-27]
- Six Talent Peaks Project in Jiangsu Province [2015-XCL-028]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [SJCX18_0759, SJCX19_0584]
- Key University Science Research Project of Jiangsu Province [18KJA130001]
- Startup Fund for Youngman Research at SJTU (SFYR at SJTU) [19X100040004]
Although spinel ZnMn2O4 (ZMO) has been regarded as a potential cathode material for aqueous zinc-ion batteries (ZIBs), the unsatisfactory long-term cycling stability seriously restricts its commercial applications. To overcome this obstacle, it is urgent to clarify the energy storage mechanism and cycling degradation reason of spinel ZMO upon Zn2+ insertion/extraction. Herein, the phase and structure evolutions of spinel ZMO are deeply probed by means of in-situ and ex-situ investigations, which is closely related to the reversible phase transformation between spinel ZMO and MnO2 during charging-discharging, while irreversible formation of inactive ZnO byproduct could cause the capacity fading after repeated cycles. Guided by the clear electrochemical mechanism, a 3D assembly of Ti-MXene (Ti3C2Tx)-stabilized ZMO nanoparticles has been designed and synthesized, in which high-conductive Ti3C2Tx scaffold can effectively inhibit the irreversible structural degradation and side reaction of spinel ZMO. As a result, the ZMO@Ti3C2Tx composite cathode exhibits a large reversible specific capacity, excellent rate capability and long-term cyclic stability (capacity retention of similar to 92.4% after 5000 cycles), superior than previously reported ZMO-based cathodes in aqueous ZIBs. For real applications, a kind of flexible aqueous ZIBs are fabricated and represent stable electrochemical performance at various deformation states, indicating their potential applications in portable/wearable electronics.
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