在水-乙醇溶液体系中通过温和的共沉淀反应成功制备了一维（Ni_1/3Co_1/3Mn_1/3） C₂O₄微米棒前驱体，通过混入碳酸氢钠及后期高温烧结得到Na_2/3Ni_1/3Co_1/3Mn_1/3O₂微米棒钠离子电池正极材料。通过XRD、FESEM、TEM及电化学测试等手段对材料的结构、形貌、组成以及电化学性能进行了分析表征。结果表明，Na_2/3Ni_1/3Co_1/3Mn_1/3O₂微米棒正极材料表现出优异的循环性能和倍率性能，在0.1 C倍率下，经过115次充放电循环后的容量保持率为70.0%；而在纯水体系中通过共沉淀法制备的Na_2/3Ni_1/3Co_1/3Mn_1/3O₂微米颗粒正极材料的容量保持率仅为39.4%；同时在高倍率下微米棒的放电比容量也有较大优势。

A mild co-precipitation route in a water-ethanol solution system is successfully adopted to synthesize one-dimensional (Ni_1/3Co_1/3Mn_1/3)C₂O₄ micro-rod precursor,which is further mixed with NaHCO₃ afterwards.After sintered in air under high temperature,one-dimensional Na_2/3Ni_1/3Co_1/3Mn_1/3O₂ micro-rod cathode material for sodium ion battery is successfully synthesized.The structure,morphology,composition and electrochemical properties of the as-prepared materials are characterized by XRD,FESEM,TEM and electrochemical tests.The results show that Na_2/3Ni_1/3Co_1/3Mn_1/3O₂ micro-rod cathode material exhibits more stable cycle performance and discharge capacity at high rate,the capacity retention of Na_2/3Ni_1/3Co_1/3Mn_1/3O₂ microd is 70.0% after 115 cycles at 0.1 C while that of Na_2/3Ni_1/3Co_1/3Mn_1/3O₂ microparticle is only 39.4%.

符军瑞(1994-),女,硕士研究生,主要从事钠离子电池材料的研究,fjr2017110455@126.com