Surfactant assisted synthesis of(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high-entropy oxide and its lithium-ion storage performance
In order to further improve the rate performance of anode material(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high-entropy oxide(HEO)in lithium-ion batteries,spinel-structured(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 nanocrystalline powder(HEO-DTAB)was synthesized by hydrothermal method using metal nitrate as metal source,urea as precipitant and dodecyl trimethyl ammonium bromide(DTAB)as surfactant.The powders obtained were characterized by XRD,SEM,EDS,specific surface area and pore size analyzer,followed by evaluation on electrode electrochemical performance.The results showed that the HEO-DTAB possessed smaller particle size(10.8 nm),more uniform dispersion,larger specific surface area(27.88 m2/g)and more uniform pore distribution in comparison to HEO without surfactant DTAB.The HEO-DTAB electrode exhibited a higher initial specific capacity(1308 mA·h/g),and an initial coulomb efficiency(82.5%),with a discharge specific capacity of 1263 mA·h/g at 0.2 A/g after 25 cycles.The discharge specific capacity at 1 A/g after 150 cycles was 1053 mA·h/g,which was 8.4 times that of HEO electrode.The nanostructure of HEO-DTAB led to a pronounced pseudocapacitance contribution ratio(91.1%at scan rate of 1.5 mV/s)of the electrode,significantly improving the specific capacity and rate performance of the material.
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