1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China 2Tianmu Lake Institute of Advanced Energy Storage Technologies, Changzhou 213300, China
Abstract：FeSO$_{4}$ has the characteristics of low cost and theoretical high energy density (799 W$\cdot$h$\cdot$kg$^{-1}$ with a two-electron reaction), which can meet the demand for next-generation lithium-ion batteries. Herein, FeSO$_{4}$ as a novel high-performance conversion-reaction type cathode is investigated. We use dopamine as a carbon coating source to increase its electronic conductivity. FeSO$_{4}$@C demonstrates a high reversible specific capacity (512 mA$\cdot$h$\cdot$g$^{-1}$) and a superior cycling performance (482 mA$\cdot$h$\cdot$g$^{-1}$ after 250 cycles). In addition, we further study its reaction mechanism. The FeSO$_{4}$ is converted to Fe and Li$_{2}$SO$_{4}$ during lithium ion insertion and the Fe|Li$_{2}$SO$_{4}$ grain boundaries further store additional lithium ions. Our findings are valuable in exploring other new conversion-type lithium ion battery cathodes.
Harper G, Sommerville R, Kendrick E, Driscoll L, Slater P, Stolkin R, Walton A, Christensen P, Heidrich O, Lambert S, Abbott A, Ryder K S, Gaines L, and Anderson P 2019 Nature575 75
2021, Vol. 38 
