Electrochemical cycling behavior of LiFePO4 cathode charged with different upper voltage limits
作者： Honghe Zheng , Lili Chai , Xiangyun Song , Vince Battaglia
DOI: 10.1016/J.ELECTACTA.2011.12.019
关键词:
摘要: Abstract Electrochemical cycling behavior of LiFePO 4 (LFP) cathode charged with different upper voltage limits has been studied. Reversible capacity the is not significantly increased by pushing up charge limit. However, limit plays a role affecting passivation film electrode. When cycled low limit, well developed and LFP electrode exhibits high surface impedance. to extremely oxidation electrolyte produces carbon-based layer coating particles. The optimized 3.9 4.3 V are obtained under experimental conditions. Long term full cell evaluated against MCMB anode. After 1000 electrochemical cycles, around 60% initial lost. Lithium inventory loss found be main factor responsible for failure. impact on performance buried in Li consumption during cycles. Fe precipitation resultant impedance rise anode side, which widely accepted decay graphite/LFP cells, observed this study.
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