Aprotic lithium-oxygen batteries (LOBs) have been considered as one of the high-energy-density alternatives to replace currently available lithium ion batteries. Highly reactive superoxide as the discharge intermediate of LOBs triggers side reactions to deteriorate LOB performances. Also, high overpotential is required to oxidize the discharge product Li₂O₂ during charge due to the non-conductive nature of Li₂O₂. Herein, we present 4-carboxy-(2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO-COOH) as a superoxide dismutase mimetic bifunctional mobile catalyst soluble in electrolytes for improving LOB performances. The role of TEMPO-COOH is two-fold: (1) the chemo-catalyst to catalyze superoxide disproportionation reaction for suppressing the superoxide-triggered side reactions during discharge; and (2) the redox mediator to oxidize Li₂O₂ in a kinetically effective way for reducing the overpotential during charge. The use of the mobile catalyst in LOB cells resulted in the 4-fold increase in cycle life from 50 cycles to 200 cycles as well as the 4-fold increase in the discharge capacity, significantly reducing the overpotential during charge.

非质子锂氧电池（LOB）被认为是替代目前可用的锂离子电池的高能量密度替代品之一。高活性超氧化物作为LOB的放电中间体会触发副反应，从而降低LOB性能。而且，由于Li ₂ O ₂的非导电性质，在充电期间需要高的超电势来氧化放电产物Li ₂ O _2。。在这里，我们提出了4-羧基-（2,2,6,6-四甲基哌啶-1-基）氧基（TEMPO-COOH）作为可溶于电解质的超氧化物歧化酶模拟双功能移动催化剂，以改善LOB性能。TEMPO-COOH的作用有两个方面：（1）化学催化剂催化超氧化物歧化反应，以抑制放电过程中超氧化物引发的副反应；（2）氧化还原介体以动力学有效的方式氧化Li ₂ O ₂，以减少充电期间的过电势。在LOB电池中使用移动催化剂导致循环寿命从50个循环增加到200个循环，增加了4倍，放电容量增加了4倍，从而大大降低了充电过程中的过电势。