Journal
NANO LETTERS
Volume 14, Issue 2, Pages 993-999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl404430e
Keywords
Lithium-ion battery; spinel epitaxial growth; heterostructure; electrochemistry
Categories
Funding
- Secondary Battery R&D program for Leading Green Industry from the MOTIE/KEIT [10042840]
- Converging Research Center Program through the National Research Foundation [2013K000210]
- Ministry of Science, ICT, and Future Planning in Korea
- National Research Foundation of Korea [2010-50181] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Tremendous research works have been done to develop better cathode materials for a large scale battery to be used for electric vehicles (EVs). Spinel LiMn2O4 has been considered as the most promising cathode among the many candidates due to its advantages of high thermal stability, low cost, abundance, and environmental affinity. However, it still suffers from the surface dissolution of manganese in the electrolyte at elevated temperature, especially above 60 degrees C, which leads to a severe capacity fading. To overcome this barrier, we here report an imaginative material design; a novel heterostructure LiMn2O4 with epitaxially grown layered (R (3) over barm) surface phase. No defect was observed at the interface between the host spinel and layered surface phase, which provides an efficient path for the ionic and electronic mobility. In addition, the layered surface phase protects the host spinel from being directly exposed to the highly active electrolyte at 60 degrees C. The unique characteristics of the heterostructure LiMn2O4 phase exhibited a discharge capacity of 123 mAh g(-1) and retained 85% of its initial capacity at the elevated temperature (60 degrees C) after 100 cycles.
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