Ru@ZrO_(2)/C-273催化剂的制备及其在锂氧电池中的电化学性能

Preparation and electrochemical properties of Ru@ZrO_(2)/C-273 catalyst for Li-O2 batteries

为开发具有高能量密度的锂氧电池,以PS微球为模板,合成了Uio-66衍生的ZrO_(2)/C-273复合材料,负载Ru后得到Ru@ZrO_(2)/C-273正极材料,组装锂氧电池,并对其性能进行了测试。实验结果表明:Ru@ZrO_(2)/C-273锂氧电池可以有效提高锂氧电池的放电性能,当电流密度为100 mA/g时,具有7429 m Ah/g的放电比容量,高于Ru@ZrO_(2)/C锂氧电池的放电比容量(6164 mAh/g);随电流密度的不断增加,Ru@ZrO_(2)/C-273锂氧电池在200 mA/g和300 mA/g的电流密度下分别可以获得6598 m Ah/g和4533 mAh/g的放电比容量;在限制比容量为500 mAh/g的循环测试中,Ru@ZrO_(2)/C-273锂氧电池具有较好的稳定性,可以稳定循环45圈。

In order to develop Li-Obatteries with high energy density,the Uio-66 derived ZrO_(2)/C-273 composite was synthesized using polystyrene(PS)microspheres as a template.After loading Ru,Ru@ZrO_(2)/C-273 cathode material was obtained,and the Li-Obattery was assembled to test its performance.The experimental results showed that Ru@ZrO_(2)/C-273 lithium-oxygen batteries could effectively improve the discharge performance,when the current density was 100 m A/g,the specific discharge capacity was 7429 m Ah/g,which was higher than that of Ru@ZrO_(2)/C lithium-oxygen battery(6164 m Ah/g).With the increase of current density,Ru@ZrO_(2)/C-273 lithium-oxygen battery could obtain the discharge specific capacity of 6598 m Ah/g and 4533 m Ah/g at 200 m A/g and 300 m A/g,respectively.In the cycle test with a limited specific capacity of 500 m Ah/g,the Ru@ZrO_(2)/C-273 lithium-oxygen battery had a good stability and cycled for 45 stable cycles.