期刊
NANOSCALE
卷 4, 期 21, 页码 6743-6747出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr32069j
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资金
- National Research Foundation of Korea (the Pioneer Research Center Program)
- Ministry of Education, Science and Technology (MEST) [2011-0001645]
- Texas Engineering Experiment Station
- National Research Foundation of Korea [2009-0083007] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
LiCoO2 nanoparticles were coated with 3.4 and 5.5 wt% of lithium vanadate (Li3VO4) by a wet-chemical and sintering method. When the electrode containing 5.5-wt% Li3VO4-coated LiCoO2 was overcharged to 4.5 V at a current of 30 mA g(-1) (similar to 0.2 C), similar to 85% of the initial discharge capacity after 100 charge-discharge cycles was maintained, compared to only similar to 67% for the electrode with bare LiCoO2 nanoparticles. The electrode with 5.5 wt% coating can also deliver 115 mA h g(-1) discharge capacity at a current of 1200 mA g(-1) (similar to 8 C) and a discharge-charge voltage of 4.5 V, which is twice the capacity of the bare LiCoO2 sample. The improvement of overcharge cyclability and high-rate capability was believed to be due to the structurally protective Li3VO4 surface coating with good Li-ion conductivity.
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