期刊
ADVANCED MATERIALS INTERFACES
卷 4, 期 19, 页码 -出版社
WILEY
DOI: 10.1002/admi.201700377
关键词
cobalt phosphide; lithium ions batteries; metal-organic frameworks; nitrogen-doped carbon
资金
- National Natural Science Foundation of China [51472271, 61376018, 51174233]
- Project of Innovation-driven Plan in Central South University [2016CX002]
- National Basic Research Program of China (973 Program) [2013CB932901]
Ultrafine CoP nanoparticles embedded in nitrogen-doped carbon matrix derived from zeolitic imidazolate framework 67 (ZIF-67) template are first obtained. The synthesis strategy only involves a facile method in which ZIF-67 precursor is phosphided under argon atmosphere. Such novel nanostructure consists of ultrafine CoP nanoparticles and N-doped carbon matrix which greatly shorten the transport length of lithium ions, effectively buffer the volume expansion during the lithiation/delithiation process, and improve the electrical conductivity. Owing to their unique architecture characteristics, the active material exhibits a superior specific capacity of 522.6 mAh g(-1) after 750 cycles at a current density of 200 mA g(-1) and outstanding cycling stability up to 2000 cycles at a high current density of 500 mA g(-1). In addition, the active material exhibits superior rate capability.
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