Rechargeable Na-CO2 Batteries Starting from Cathode of Na2CO and Carbon Nanotubes

Rechargeable Na-CO2 Batteries Starting from Cathode of Na2CO and Carbon Nanotubes

Jianchao Sun;Yong Lu;Hao Yang;Mo Han;Lianyi Shao;Jun Chen

【期刊名称】《研究（英文）》 【年(卷),期】2018(000)001

【摘要】Na-CO2 batteries have attracted significant attentions due to their high energy density and effective utilization of greenhouse gas CO2.However,all reported Na-CO2 batteries employ excessive preloaded metal Na,which will lead to safety issues such as dendrite formation and short circuit.In addition,the charging mechanism of reported Na-CO2 batteries is not very clear.Here we report the Na-CO2 batteries,starting from the cathode of cheap Na2CO3 and multiwalled carbon nanotubes (CNTs).Due to the effective electron transfer and high reactivity,the decomposition ofNa2CO3 and CNTs could take place under 3.8 V.The charging mechanism of2Na2CO3 + C → 4Na + 3CO2 without any side reactions is revealed by in/ex situ techniques such as Raman,gas chromatograph,and

optical

microscope.Dendrite-free

Na

can

quantitatively deposit on the Super P/A1 anode because of large specific surface area and low nucleation barrier of the anode for Na plating.The batteries could deliver an energy density of 183 Wh kg-1 (based on the whole mass of the pouch-type batteries,4 g) with stable cycling performance.This work reveals that safe rechargeable Na-CO2