Taking advantage of Li-evaporation in LiCoO_(2) as cathode for proton-conducting solid oxide fuel cells  

作　　者：Yangsen XU Shoufu YU Yanru YIN Lei BI 

机构地区：[1]School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China

出　　处：《Journal of Advanced Ceramics》2022年第12期1849-1859,共11页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51972183);the Hundred Youth Talents Program of Hunan;the Startup Funding for Talents at University of South China.

摘　　要：LiCoO_(2),a widely used electrode material for Li-ion batteries,was found to be suitable as a cathode material for proton-conducting solid oxide fuel cells(H-SOFCs).Although the evaporation of Li in LiCoO_(2) was detrimental to the Li-ion battery performance,the Li-evaporation was found to be beneficial for the H-SOFCs.The partial evaporation of Li in the LiCoO_(2) material preparation procedure led to the in-situ formation of the LiCoO_(2)+Co_(3)O_(4) composite.Compared to the cell using the pure phase LiCoO_(2) cathode that only generated moderate fuel cell performance,the H-SOFCs using the LiCoO_(2)+Co_(3)O_(4) cathode showed a high fuel cell performance of 1160 mW·cm^(-2) at 700℃,suggesting that the formation of Co_(3)O_(4) was critical for enhancing the performance of the LiCoO_(2) cathode.The first-principles calculation gave insights into the performance improvements,indicating that the in-situ formation of Co_(3)O_(4) due to the Li-evaporation in LiCoO_(2) could dramatically decrease the formation energy of oxygen vacancies that is essential for the high cathode performance.The evaporation of Li in LiCoO_(2),which is regarded as a drawback for the Li-ion batteries,is demonstrated to be advantageous for the H-SOFCs,offering new selections of cathode candidates for the H-SOFCs.

关 键 词：CATHODE COMPOSITE proton conductor solid oxide fuel cells(SOFCs) 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ174.1[化学工程—陶瓷工业]