Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 22, Issue 17, Pages 3658-3664Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201102669
Keywords
lithium-ion batteries; structural defects; Li plus storage sites; amorphous materials; Li plus ion mobility
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Funding
- National Research Foundation of Korea
- MEST [R31-10013, NRF-2010-C1AAA001-2010-0029065]
- National Research Foundation of Korea [R31-2012-000-10013-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This work demonstrates that structural defects in amorphous metal oxide electrodes can serve as a reversible Li+ storage site for lithium secondary batteries. For instance, molybdenum dioxide electrode in amorphous form (a-MoO2) exhibits an unexpectedly high Li+ storage capacity (up to four Li per MoO2 unit), which is larger by a factor of four than that for the crystalline counterpart. The conversion-type lithiation is discarded for this electrode from the absence of Mo metal and lithium oxide (Li2O) in the lithiated a-MoO2 electrode and the retention of local structural framework. The sloping voltage profile in a wide potential range suggests that Li+ ions are inserted into the structural defects that are electrochemically nonequivalent. This electrode also shows an excellent cycle stability and rate capability. The latter feature is seemingly due to a rather opened Li+ diffusion pathway provided by the structural defects. A high Li+ mobility is confirmed from nuclear magnetic resonance study.
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