Effect of Fuel to Oxidant Dosage Ratio on Structure and Lithium Storage Properties of Spinel High Entropy Oxides by Solution Combustion Synthesis
Spinel(K1/6 Co1/6 Cr1/6 Fe1/6 Mn1/6 Ni1/6)3O4 high entropy oxide powder was synthesized by solution combustion synthesis method by taking metal nitrate as oxidant and glycine as fuel at 750 ℃,and was used as anode materials for lithium ion battery.The effect of fuel to oxidant molar ratio on microstructure and lithium storage performance of the products were studied.The results show that the prepared high entropy oxides had uniform chemical composition and a mesoporous structure.With the increase of the molar ratio of fuel to oxidant,the crystallinity,lattice constant,cell volume,specific surface area and pore volume of the high entropy oxides increased,the grain size decreased first and then increased,and the most probable pore size decreased first and then increased and then decreased.When the molar ratio of fuel to oxidant was 0.5 and 1.0,the prepared powder had similar specific surface area and pore structure,but the former had smaller grain size and the most probable pore size.When the molar ratio of fuel to oxidant was 0.5,the prepared electrode had the highest specific discharge capacity(1 196 mA·h·g-1)after 100 cycles at a low current density of 0.2 A·g-1,which was related to the small grain size and the most possible pore size and the moderate crystallicity of the electrode material at this time.When the molar ratio of fuel to oxidant was 1.0,the electrode had the best rate performance.After cycling for 400 cycles at 1.0 A·g-1 high current density,the specific discharge capacity reached 1 133 mA·h·g-1,and the specific capacity retention remained 59.4％at 3 A·g 1 high current density,which was mainly related to the larger cell volume.
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