Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 8, Pages 9226-9235Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20846
Keywords
MXene; Fe3O4; self-assembly; anode material; lithium ion capacitor
Funding
- Research Grants Council (RGC) of Hong Kong [14203715, 14218516]
- National Natural Science Foundation of China [51902188]
- Natural Science Foundation of Jiangsu Province [BK20190207]
- Research Grants Council (RGC) of Hong Kong SAR Government of China
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Conversion-type magnetite shrewdly shows abundance, nontoxicity, and high lithium storage capacity. However, either pristine magnetite or nanocomposites with two-dimensional materials cannot prevent restacking, pulverization, and poor structural homogeneity simultaneously because of a lack of universal interfacial interactions. Here, an electrostatic self-assembly strategy is uncovered between hollow Fe3O4/C microspheres (with H+-induced quasi intrinsic positive charge) and few-layer MXenes (with intrinsic negative charge from terminating functionalities). This strategy realizes the uniform and interconnected architecture of Fe3O4/C@MXene that favors fast Li+ diffusion, easy electron/charge transfer, and suppressed pulverization. Specifically, after the long-term cycling, an undegraded specific capacity of 907 mA h g(-1) remains at 0.5 A g(-1). Further adoption of such superior anode in 4.0 V lithium-ion capacitors results in a high energy density of 130 W h kg(-1), a maximum power density of 25,000 W kg(-1), and excellent cycling stability. This work thus sheds light on a generic self-assembly process where intrinsic electrostatic interaction plays an essential role.
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