期刊
ADVANCED SCIENCE
卷 5, 期 12, 页码 -出版社
WILEY
DOI: 10.1002/advs.201800763
关键词
carbonate electrolytes; charge; discharge mechanisms; CoSe2; dual-role anode materials; Li-ion batteries; sodium-ion batteries
资金
- National Natural Science Foundation of China [51602106]
- Fundamental Research Funds for Central Universities (SCUT) [2017MS066, 2017MS006]
- Guangdong Innovative and Entrepreneurial Research Team Program [2016ZT06N569]
It is of fundamental and technological significance to develop dual-role anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) with high performance. Here, a composite material based on CoSe2 nanoparticles encapsulated in N-doped carbon framework intertwined with carbon nanotubes (CoSe2@N-CF/CNTs) is prepared successfully from cobalt-based zeolitic imidazolate framework (ZIF-67). As anode materials for LIBs, CoSe2@N-CF/CNTs composites deliver a reversible capacity of 428 mAh g(-1) even after 500 cycles at a current density of 1 A g(-1) with almost 100% Coulombic efficiency. The charge and discharge mechanisms of CoSe2 are characterized using ex situ X-ray diffraction and Raman analysis, from which the lithiation products of CoSe2 are found to be LixCoSe2 and Li2Se, which are further converted to CoSe2 upon delithiation. The CoSe2@N-CF/CNTs composites also demonstrate excellent electrochemical performance as anode materials for SIBs with a carbonate-based electrolyte, with specific capacities of 606 and 501 mAh g(-1) at 0.1 and 1 A g(-1) in the 100th cycle. The electrochemical performance of the anode materials is further studied by pseudocapacitance and galvanostatic intermittent titration technique (GITT) measurements. This work may be exploited for the rational design and development of dual-role anode materials for both Li- and Na-ion batteries.
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