不同锂离子正极材料掺杂对硫正极性能的影响  

Effect of doping with different lithium-ion cathode materials on performance of sulfur cathode

作　　者：蔡志鹏 曾芳磊 李宁 袁宁一 CAI Zhipeng;ZENG Fanglei;LI Ning;YUAN Ningyi(School of Materials Science and Engineering,Changzhou University,Changzhou Jiangsu 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《电源技术》2023年第10期1268-1272,共5页Chinese Journal of Power Sources

基　　金：中国博士后科学基金项目(2022M721374)。

摘　　要：探讨了硫正极中掺入锂离子正极材料(磷酸铁锂LiFePO_(4)、三元材料NCM、富锂锰基材料LRMB)对锂硫电池性能的影响。研究发现,富锂锰基材料最有利于提高锂硫电池的电化学性能,并且其添加量为10%(质量分数)时,效果最好。通过一系列电化学性能测试发现,硫正极中掺杂锂离子正极材料能够调控活性硫的电化学行为,促进可溶性长链多硫化锂(Li_(2)Sx)向难溶性短链硫化锂(Li_(2)S)的转化,进而提高锂硫电池的电化学可逆性,降低电池的极化现象。这为提高锂硫电池的电化学性能提供了新的思路。The effect of adding lithium-ion cathode materials(lithium iron phosphate LiFePO_(4),ternary material NCM,lithium-rich manganese-based material LRMB)into the sulfur cathode on the performance of lithium-sulfur batteries was discussed.It's found that lithium-rich manganese-based materials are most conducive to improving the electrochemical performance of lithium-sulfur batteries,and the effect is the best when its addition amount is 10%.Through a series of electrochemical performance tests,it’s found that doping lithium-ion cathode materials into sulfur cathodes can regulate the electrochemical behavior of active sulfur and promote the conversion of soluble long-chain lithium polysulfide(Li_(2)Sx)to insoluble short-chain lithium sulfide(Li_(2)S),the electrochemical reversibility of the lithium-sulfur battery can be improved,and the polarization phenomenon of the battery can be reduced.It provides a new idea for improving the electrochemical performance of Li-sulfur batteries.

关 键 词：锂硫电池 锂离子正极材料 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]