Abstract
The electrochemical performance and thermal stability of Li(Ni0.5Co0.2Mn0.3)O2, LiMn2O4 and LiFePO4 are investigated by the multi-channel battery cycler, electrochemical workstation, thermogravimetric analysis (TGA) and C80 instrument in this work. For electrochemical performance, Li(Ni0.5Co0.2Mn0.3)O2 shows the highest specific capacity but the worst cycle stability. For the thermal stability, the experimental results of thermogravimetry and C80 indicate that the charged Li(Ni0.5Co0.2Mn0.3)O2 has the worst thermal stability compared with charged LiFePO4 and LiMn2O4. It is also testified by calculating the chemical kinetic parameters of cathode materials based on the Arrhenius law. The pure Li(Ni0.5Co0.2Mn0.3)O2 starts to self-decompose at around 250 °C with total heat generation of -88 J/g. As for a full battery, the total heat generation is -810 J/g with exothermic peak temperature of 242 °C. The present results show that thermal runaway is more likely to occur for. Li(Ni0.5Co0.2Mn0.3)O2 with the full battery.
Highlights
Lithium-ion batteries (LIBs) are widely used in a variety of areas for their high-energy density, such as portable telephones, computers and electric vehicles (EVs) (Sun et al, 2009; Hannan et al, 2017)
The present results show that the capacity retention rate after 100 cycles of Li(Ni0.5Co0.2Mn0.3)O2 is 57%, while the capacity retention rate after 100 cycles of LiMn2O4 and LiFePO4 is higher, 82 and 95%, respectively
The comparison of electrochemical performance and thermal stability among charged Li(Ni0.5Co0.2Mn0.3)O2, LiMn2O4, and LiFePO4 were investigated in this paper
Summary
Lithium-ion batteries (LIBs) are widely used in a variety of areas for their high-energy density, such as portable telephones, computers and electric vehicles (EVs) (Sun et al, 2009; Hannan et al, 2017). Thermal Stability for Charged Cathodes et al enhanced the thermal safety and high power performance of LiFePO4 with coated carbon (Zaghib et al, 2012). The electrochemical performance and thermal stability of charged Li(Ni0.5Co0.2Mn0.3)O2, LiMn2O4 and LiFePO4 are analyzed and compared.
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