物理化学学报2022，Vol.38Issue(8)：28-41,14.DOI:10.3866/PKU.WHXB202009071
锂-空气电池的实用化之路:规避二氧化碳负面效应
Toward Practical Lithium-Air Batteries by Avoiding Negative Effects of CO2
摘要
Abstract
The gradual popularization of new energy technologies has led to rapid development in the field of electric transportation.At present,the demand for high-power density batteries is increasing and next-generation higher-energy battery chemistries aimed at replacing current lithium-ion batteries are emerging.The lithium-air batteries(LABs)are thought to be the ultimate energy conversion and storage system,because of their highest theoretical specific energy compared with other known battery systems.Current LABs are operated with pure O2 provided by weighty O2 cylinders instead of the breathing air,and this configuration would greatly undermine LAB's energy density and practicality.However,when the breathing air is used as O2 feed for LABs,CO2,as an inevitable impurity therein,usually leads to severe parasitic reactions and can easily deteriorate the performance of LABs.Specifically,Li2O2 will react with CO2 to form Li2CO3 on the cathode surface.Compared with the desired discharge product Li2O2,the Li2CO3 is an insulating solid,which will accumulate and finally passivate the electrode surface leading to the"sudden death"phenomenon of LABs.Moreover,Li2CO3 is hard to decompose and a high overpotential is required to charge LABs containing Li2CO3 compounds,which not only degrades energy efficiency but also decomposes other battery components(e.g.,cathode materials and electrolytes).In recent years,researchers have proposed many strategies to alleviate the negative effects brought about by Li2CO3,such as catalyst engineering,electrolyte design,and so on,in which O2 selective permeable membranes are worth noting.This review summarizes the recent progresses on the understanding of the CO2-related chemistry and electrochemistry in LABs and describes the various strategies to mitigate and even avoid the negative effects of CO2.The perspective of CO2 separation technology using selective permeable membranes/filters in the context of LABs is also discussed.关键词
锂-空气电池/反应机制/二氧化碳分离Key words
Lithium-air battery/Reaction mechanism/CO2 separation分类
化学化工引用本文复制引用
王天杰,王耀伟,陈宇辉,刘建鹏,史会兵,郭丽敏,赵志伟,刘春太,彭章泉..锂-空气电池的实用化之路:规避二氧化碳负面效应[J].物理化学学报,2022,38(8):28-41,14.基金项目
The project was supported by the National Key R&D Program of China(2016YFB0100100,2018YFB0104400),the National Natural Science Foundation of China(21972055,21825202,21575135,21733012,51773092,21975124,21972133)and the Newton Advanced Fellowships of Royal Society of England(NAF/R2/180603).国家重点研发计划(2016YFB0100100,2018YFB0104400),国家自然科学基金(21972055,21825202,21575135,21733012,51773092,21975124,21972133),英国皇家学会牛顿基金(NAF/R2/180603)资助项目 （2016YFB0100100,2018YFB0104400）
