铜镍共掺杂铁锰层状氧化物钠离子电池正极材料的制备与性能研究

Preparation and properties of copper-nickel co-doped ferromanganese layered oxide cathode materials for sodium-ion batteries

利用溶胶-凝胶法成功合成了Cu/Ni共掺杂的P2相Na_(0.67)Fe_(0.1)Mn_(0.9)O_(2)钠离子电池层状氧化物正极材料,研究了共掺杂对该层状氧化物形貌结构和电化学性能的影响。结果表明,Cu/Ni共掺杂后材料的表面更加光滑、层状结构更加清晰,且四种掺杂材料的长循环稳定性和高电流密度下的倍率性能相较于未掺杂材料也得到提高。其中Na_(0.67)Fe_(0.1)Mn_(0.75)Cu_(0.05)Ni_(0.1)O_(2)在经过50圈充放电循环后具有92.2%的容量保持率,在循环100圈后仍具有87.2%的容量保持率,且该材料经过0.1C-0.5C的倍率循环后,容量仅损耗10.26%,展现了绝佳的电化学性能。

Cu/Ni co-doped P2 phase Na_(0.67)Fe_(0.1)Mn_(0.9)O_(2)sodium-ion battery layered oxide anode materials were successfully synthesized by sol-gel method,and the effects of co-doping on the morphology and electrochemical properties of the layered oxides were investigated.The results show that the surface of the Cu/Ni co-doped materials is smoother and the layer structure is clearer,and the long cycle stability and the multiplicity performance at high current density of the four doped materials are also improved compared with the undoped materials.Among them,Na_(0.67)Fe_(0.1)Mn_(0.75)Cu_(0.05)Ni_(0.1)O_(2)has a capacity retention rate of 92.2%after 50 cycles of charge/discharge,and still has a capacity retention rate of 87.2%after 100 cycles,and the capacity of the material is only 10.26%depleted after a multiplicative cycling of 0.1C-0.5C,which shows an excellent electrochemical performance.