Abstract
The aim of this work was to compare the electrochemical behaviors and safety performance of graphite and the lithium titanate spinel Li 1.33Ti 1.67O 4 with half-cells versus Li metal. Their electrochemical properties in 1 M LiPF 6/EC + DEC (1:1 w/w) or 1 M LiPF 6/PC + DEC (1:1 w/w) at room and elevated temperatures (30 and 60 °C) have been studied using galvanostatic cycling. At 30 °C graphite has higher reversible capacity than Li 1.33Ti 1.67O 4 when using the LiPF 6/EC + DEC as electrolyte. At 60 °C graphite declines in cell capacity yet Li 1.33Ti 1.67O 4 remains almost unchanged. In a propylene carbonate (PC) containing electrolyte, graphite electrode exfoliates and loses its mechanical integrity while Li 1.33Ti 1.67O 4 electrode is very stable. An accelerating rate calorimeter (ARC) and microcalorimeter have been used to compare the thermal stability of lithiated lithium titanate spinel and graphite. Results show that Li 1.33Ti 1.67O 4 may be used as an alternative anode material offering good battery performance and higher safety.
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