Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Articles
Prolonged Cycle Life for Li4Ti5O12//[Li3V2(PO4)3/Multiwalled Carbon Nanotubes] Full Cell Configuration via Electrochemical Preconditioning
Naohisa OKITAEtsuro IWAMASatoyuki TATSUMITrang Nguyên Hồng VÕWako NAOIMcMahon Thomas Homer REIDKatsuhiko NAOI
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JOURNALS OPEN ACCESS

2019 Volume 87 Issue 3 Pages 148-155

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Abstract

Full cells consisting of nanocrystalline Li3V2(PO4)3 (LVP) positive and standard commercial Li4Ti5O12 (LTO) negative electrodes demonstrated outstanding cyclability: capacity retention of 77% over 10,000 cycles. We achieved this stable cycle performance by electrochemical preconditioning of LTO with Li prior to full-cell cycling. The strategy of Li preconditioning not only allows adjustment of the state of charge (SOC) between negative and positive electrodes, but also gives rise to the formation of a protective covering layer on the LTO surface. As we show, this covering layer plays an important role in preventing a key performance-limiting phenomenon—namely, the deposition of vanadium eluted from LVP onto LTO, which degrades the coulombic efficiency of Li+ intercalation/deintercalation into LTO crystals—yielding minimal SOC shifts and stable full-cell cycling.

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© 2019 The Electrochemical Society of Japan
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