AUTHOR=Wang Qian , Wu Yongzi , Pan Ning , Yang Chenyu , Wu Shuo , Li Dejie , Gu Shaonan , Zhou Guowei , Chai Jinling 

TITLE=Preparation of rambutan-like Co0.5Ni0.5Fe2O4 as anode for high–performance lithium–ion batteries

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.1052560

DOI=10.3389/fchem.2022.1052560

ISSN=2296-2646

ABSTRACT=<p>NiFe<sub>2</sub>O<sub>4</sub> is a kind of promising lithium ion battery (LIB) electrode material, but its commercial applications have been limited due to the electronic insulation property and large volume expansion during the conversion reaction process, which results in rapid capacity decrease and poor cycling stability. We synthesized rambutan-like Co<sub>0.5</sub>Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> using the self-templating solvothermal method. The special structure of Co<sub>0.5</sub>Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> which was formed by the assembly of numerous nanosheets could effectively buffer the volume change during the charging and discharging process. Partial substitution of Ni with Co. in NiFe<sub>2</sub>O<sub>4</sub> leads to Co<sub>0.5</sub>Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub>, the coexisting of both nickel and cobalt components is expected to provide more abundant redox reactions. The specific capacity of the rambutan-like Co<sub>0.5</sub>Ni<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> as an anode material for LIB could reach 963 mA h g<sup>−1</sup> at the current density of 500 mA g<sup>−1</sup> after 200 cycles, confirming that the as-synthesized material is a promising candidate for LIBs.</p>