B位Cu掺杂类钙钛矿型La1.6Sr0.4Ni0.6Cu0.4O4作为锂-空气电池高效阴极催化剂及其催化机理的研究

Perovskite-like La1.6Sr0.4Ni0.6Cu0.4O4 with Cu doping at B-sites as a high-performance cathodic catalyst for Li-O2 batteries and its catalytic mechanism

采用甘氨酸-硝酸盐燃烧法制备了类钙钛矿A2BO4型过渡金属氧化物La1.6Sr0.4NiO4及La1.6Sr0.4Ni0.6Cu0.4O4作为非水系锂-空气电池阴极催化材料.相比于La1.6Sr0.4NiO4,B位Cu元素掺杂的La1.6Sr0.4Ni0.6Cu0.4O4粉体粒径更小且分散更均一,表现更优异的电化学活性.在电流密度为100mA/g时,组装的锂-空气电池的首次放电比容量高达8294mAh/g,充电平台低于3.7V,并且可稳定循环130次以上.获得良好的电催化活性归因于La1.6Sr0.4Ni0.6Cu0.4O4催化剂高氧缺位,电荷缺陷及形貌优势.

Perovskite-like transition-metal oxides La1.6Sr0.4NiO4 and La1.6 Sr0.4 Ni0.6 Cu0.4O4 that used as cathode materials in non-aqueous Li-air batteries are fabricated by glycine-nitrate combustion methods.Compared with La1 6Sr0 4NiO4,the Cu-doped La1.6Sr0.4Ni0.6Cu0.4O4 has smaller particles size and more uniformly distribution and exhibits higher electrocatalytic activity.The initial discharge capacity of Li-air cell with La1.6Sr0.4 Ni0.6 Cu0.4 O4 is up to 8 294mAh/g,the charging platform is 3.7V,and stable cycling above 130 at the current density of 100 mA/g.Such good electrocatalytic activity is mainly ascribed to the high oxygen vacancies,charge defects and their morphology superiority in La1.6 Sr0.4Ni0.6Cuo.4 O4 due to the Cu doping at B sites.