Regulating the nucleation of Li_(2)CO_(3) and C by anchoring Li-containing carbonaceous species towards high performance Li-CO_(2) batteries  

作　　者：Shiyu Ma Youcai Lu Hongchang Yao Yubing Si Qingchao Liu Zhongjun Li 

机构地区：[1]Green Catalysis Center,and College of Chemistry,Zhengzhou University,Zhengzhou 450001,Henan,China

出　　处：《Journal of Energy Chemistry》2022年第2期472-479,共8页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.21701145 and 21701146,21671176);China Postdoctoral Science Foundation(Grant Nos.2017M610459 and 2018T110739)。

摘　　要：Li-CO_(2) batteries provide an attractive and potential strategy for CO_(2) utilization as well as energy conversion and storage with high specific energy densities.However,the poor reversibility caused by the decomposition obstacles of Li_(2)CO_(3) and C products is still a challenge for Li-CO_(2) batteries,which seriously influences its electrochemical performances.Herein,a free-standing MnOOH arrays cathode has been prepared and employed in Li-CO_(2) battery,which realizes a great improvement of electrochemical performances by adjusting the discharge products distribution.Experiments coupled with theoretical calculations verifies that the formation of Li-containing carbonaceous species(LiCO_(2),LiCO and Li_(2) CO_(3))bonded with MnOOH through Li ion regulates the nucleation behavior of Li_(2)CO_(3) and C,making them grown on MnOOH uniformly.The fine Li_(2) CO_(3) grains(with a size about 5 nm)embedded into carbon matrix greatly enlarges the contact interface between them,facilitating the transmission of electrons through the discharge products and finally improves CO_(2) evolution activity.This ingenious design strategy of regulating discharge products distribution to improve electrochemical performances provides a promising way to develop advanced Li-CO_(2) batteries.

关 键 词：Li-CO_(2)battery MnOOH arrays Interface Discharge mechanism 

分 类 号：TQ131.11[化学工程—无机化工] TM911.41[电气工程—电力电子与电力传动]