利用高温固相反应法制备了新型三元锂离子电池正极材料 Li2 Ru1/3 Co1/3 M1/3 O3(M＝Mn、Ni、Fe)。通过 X 射线衍射技术和电化学性能测试对Li2 Ru1/3 Co1/3 M1/3 O3的微观结构及其电化学性能进行了表征。研究结果表明,Li2 Ru1/3 Co1/3 Ni1/3 O3和Li2 Ru1/3 Co1/3 Fe1/3 O3为六方层状结构,空间群为 R-3M,而 Li2 Ru1/3 Co1/3 Mn1/3 O3保持了单斜结构；电化学性能测试表明 Li2 Ru1/3 Co1/3 Mn1/3 O3的电化学性能优于掺杂Fe和Ni 的三元材料,该材料具有良好的循环性能,在电流密度为16 mA/g 情况下,首次充电容量达到190 mAh/g,首次放电容量为171 mAh/g,50次循环后容量保持率为98％。
Li2 Ru1/3 Co1/3 M1/3 O3 (M = Mn,Ni,Fe)as new cathode material for Li-ion battery were synthesized by solid state reaction.The microstructure and electrochemical performance of Li2 Ru1/3 Co1/3 M1/3 O3 were inves-tigated by X-ray diffraction and electrochemical tests.The result indicated that Li2 Ru1/3 Co1/3 Ni1/3 O3 and Li2 Ru1/3 Co1/3 Fe1/3 O3 had a layered structure and their space groups were R-3M.Li2 Ru1/3 Co1/3 Mn1/3 O3 electrode had a good electrochemical reversibility between 2.5 and 4.8 V.During the chage and discharge process,the ini-tial charging capacity can reach 190 mAh/g at a charge current density of 16 mA/g.The discharge capacity re-tention was 98% after 50 cycles.
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