期刊
NANO LETTERS
卷 17, 期 9, 页码 5740-5746出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02698
关键词
Lithium-ion batteries; Fe2N; carbon encapsulation; high volumetric capacity; porous; conversion electrode
类别
资金
- National Science Foundation [DMR-1508558]
- State Key Laboratory of Advanced Technology for Materials and Processing at Wuhan University of Technology [2017-KF-3]
- China Scholarship Council
- National Natural Science Foundation of China [51521001]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1508558] Funding Source: National Science Foundation
The development of inexpensive electrode materials with a high volumetric capacity and long cycle-life is a central issue for large-scale lithium-ion batteries. Here, we report a nanostructured porous Fe2N anode fully encapsulated in carbon microboxes (Fe2N@C) prepared through a facile confined anion conversion from polymer coated Fe2O3 microcubes. The resulting carbon microboxes could not only protect the air-sensitive Fe2N from oxidation but also retain thin and stable SEI layer. The appropriate internal voids in the Fe2N cubes help to release the volume expansion during lithiation/delithiation processes, and Fe2N is kept inside the carbon microboxes without breaking the shell, resulting in a very low electrode volume expansion (the electrode thickness variation upon lithiation is similar to 9%). Therefore, the Fe2N@C electrodes maintain high volumetric capacity (1030 mA h cm(-3) based on the lithiation-state electrode volume) comparable to silicon anodes, stable cycling performance (a capacity retention of over 91% for 2500 cycles), and excellent rate performance. Kinetic analysis reveals that the Fe2N@C shows an enhanced contribution of capacitive charge mechanism and displays typical pseudocapacitive behavior. This work provides a new direction on designing and constructing nanostructured electrodes and protective layer for air unstable conversion materials for potential applications as a lithium-ion battery/capacitor electrode.
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