AUTHOR=Zhong Guobin , Gong Jinqiu , Wang Chao , Xu Kaiqi , Chen Haodong 

TITLE=Comparison of the Electrochemical Performance and Thermal Stability for Three Kinds of Charged Cathodes

JOURNAL=Frontiers in Energy Research

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2018.00110

DOI=10.3389/fenrg.2018.00110

ISSN=2296-598X

ABSTRACT=<p>The electrochemical performance and thermal stability of Li(Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>)O<sub>2</sub>, LiMn<sub>2</sub>O<sub>4</sub>, and LiFePO<sub>4</sub> are investigated by the multi-channel battery cycler, electrochemical workstation, thermogravimetric analysis (TGA) and C80 instrument in this work. For electrochemical performance, Li(Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>)O<sub>2</sub> 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(Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>)O<sub>2</sub> has the worst thermal stability compared with charged LiFePO<sub>4</sub> and LiMn<sub>2</sub>O<sub>4.</sub> It is also testified by calculating the chemical kinetic parameters of cathode materials based on the Arrhenius law. The pure Li(Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>)O<sub>2</sub> 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(Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>)O<sub>2</sub> with the full battery.</p>