期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 31, 页码 16177-16182出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta03685b
关键词
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资金
- Chinese National Key Fundamental Research Project [2014CB932302, 2014CB932303]
- National Natural Science Foundation of China [21373111, 21403106, 21403107, 51202106]
- Natural Science Foundation of Jiangsu Province of China [BK2012309, BK20140055]
- Fundamental Research Funds for the Central Universities [20620140622, 20620140625]
Mesoporous NiO nanosheets with a single-crystalline structure were investigated as an oxygen electrode catalyst in a non-aqueous Li-O-2 battery. The recharge voltage plateau achieved for the NiO-based Li-O-2 battery was ca. 3.95 V, ca. 200 mV negatively shifted compared with that for beta-Ni(OH)(2) and acetylene black. The reaction mechanism during the charge process for the NiO-based Li-O-2 battery was intensively researched. The results of X-ray photoelectron spectroscopy characterization indicated that Li2O2 and Li2CO3 were formed during the discharge process, which can be decomposed after recharge. These demonstrated that the NiO nanosheet exhibited a good activity for the decomposition of Li2O2 and Li2CO3. Furthermore, the results of the gas chromatography-mass spectrometry test reflected two steps of the recharge process, i.e., the oxidation of Li2O2 when the potential was below 4.0 V and the decomposition of Li2O2 and Li2CO3 when the potential was above 4.0 V. Moreover, no obvious performance decay was observed in the NiO-based battery even after 40 cycles when the capacity was limited to 500 mA h g(-1), indicating an impressive cycling performance.
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