基于尖晶石锰酸锂正极材料的新型水系储能体系  

Novel Aqueous Energy Storage Systems Based on Spinel LiMn_2O_4 Cathode Material

作　　者：董晓丽[1] 王永刚[1] 夏永姚[1] DONG Xiaoli;WANG Yonggang;XIA Yongyao(Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM （Collaborative Innovation Center of Chemistry for Energy Materials）, Fudan University, Shanghai 200433, Chin)

机构地区：[1]复旦大学化学系复旦大学新能源研究院能源材料化学协同创新中心,上海200433

出　　处：《化学世界》2018年第3期129-139,共11页Chemical World

基　　金：国家重点研发计划(No.2016YFB0901500);国家自然科学基金(Nos.21622303;21373060)资助项目

摘　　要：以水溶液为电解液的水系锂离子电池体系因其功率高、安全性好且成本低廉得到广泛的研究。由于水系电解液的电化学窗口较窄(≈1.23V),在选择水系锂离子电池正极材料时便受到了一定的限制。尖晶石锰酸锂LiMn_2O_4由于合适的充放电电压平台和较好的热稳定性,而且来源广、成本低、合成工艺简单、环境友好等特点,被认为是最具发展前景的水系锂离子电池正极材料。然而LiMn_2O_4在充放电过程中锰溶解导致电池较差的循环稳定性,这在很大程度上限制了其应用。LiMn_2O_4在水系电解液中的循环稳定性,尤其是高温下的循环稳定性,需要研究者深入探究。围绕LiMn_2O_4材料的合成与结构设计,研究了其在水系电解液中容量衰减机理,并基于LiMn_2O_4正极材料建立了一系列具有优异电化学性能的新型水系储能体系。Aqueous Li-ion batteries（ALIBs）have attracted great attention owing to their high power,great safety and low cost. Limited by the narrow electrochemical window of the aqueous electrolytes（approximately 1.23 V）,materials whose working potential is located between H2 evolution potential and O2 evolution potential are suitable for ALIBs.Spinel LiMn2O4 has been regarded as the most prospective cathode material for ALIBs due to its merits of proper potential,excellent thermodynamic cycling stability,as well as easy preparation,environmental friendly,low cost and abundance.However,the issue of Mn dissolution in the electrolyte leads to the poor cycling performance,which greatly limits the application of LiMn2O4.Great efforts are needed to investigate the stability of LiMn2O4,especially at elevated temperature.The research team of chemistry and shanghai key laboratory of molecular catalysis and innovative materials in fudan university have focused on the materials synthesis and structure design and capacity fading mechanism analysis for LiMn2O4 cathode,and simultaneously proposed a series of novel ALIBs based on LiMn2O4 cathode with improved electrochemical performance.

关 键 词：尖晶石锰酸锂 水系电解液 储能体系 

分 类 号：TQ131.11[化学工程—无机化工]