锂氧气电池的正极氧还原反应(ORR)和析氧反应(OER)的缓慢动力学过程严重影响了电池性能。因此,设计制备了一种一维纳米棒状CoSe₂@Co_0.85Se复合材料作为锂氧气电池正极催化剂。结果表明,独特的多孔棒状结构使材料具有高比表面积和丰富的催化活性位点,复合材料界面上的电子相互作用优化了界面电子结构,有利于电荷转移和反应中间体的吸脱附,从而提高了ORR/OER反应动力学。当该复合材料用于锂氧气电池正极催化剂时表现出优异的放电比容量(14 748 mAh/g)和循环稳定性(231圈)。

The slow kinetics of the cathode oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at lithium-oxygen battery seriously affects battery's performance.Herein,CoSe₂@Co_0.85Se,a one-dimensional nanorod-like composite,is designed and prepared as a cathode catalyst for lithium-oxygen battery.Results indicate that the unique porous rod-like structure provides the composite with a high surface area and abundant catalytic active sites.The strong electronic interaction at the composite heterostructure interface optimizes the electronic structure,facilitating charge transfer and the desorption of reaction intermediates,thereby improving ORR/OER reaction kinetics.When used as a cathode catalyst for lithium-oxygen battery,the composite exhibits excellent discharge specific capacity (14 748 mAh·g^-1) and cyclic stability (231 cycles).

周伟豪(1999-),男,硕士生,研究方向为锂空气电池正极材料,2825451952@qq.com;张大伟(1976-),男,博士,教授,研究方向为新能源电池材料,通讯联系人,zhangdw@ustc.edu.cn。