Na_(0.6)7Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2)的空气稳定性提升及其钠离子电池性能研究  

Study on the Performance of Air-Stabilized Na_(0.6)7Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2) Cathode Material for the Sodium-Ion Battery

作　　者：黄志雄 吴柄屿 金子涵 卢俊杰 杨刚[1,2] 施少君 HUANG Zhixiong;WU Bingyu;JIN Zihan;LU Junjie;YANG Gang;SHI Shaojun(Jiangsu Key Laboratory of Advanced Functional Materials,Changshu Institute of Technology,Changshu 215500,China;School of Materials Engineering,Changshu Institute of Technology,Changshu 215500,China)

机构地区：[1]常熟理工学院江苏省新型功能材料重点建设实验室,江苏常熟215500 [2]常熟理工学院材料工程学院,江苏常熟215500

出　　处：《常熟理工学院学报》2022年第5期1-4,共4页Journal of Changshu Institute of Technology

摘　　要：钠离子电池由于其与锂离子电池类似的工作机理受到了广泛的关注.而P2-Na_(0.67)MnO_(2)中Mn^(3+)的Jahn-Teller效应会引起相变和结构坍塌从而导致循环性能变差.此外,存放在空气中时,H_(2)O和CO_(2)容易与之反应生成NaOH和Na_(2)CO_(3).本研究设计了Ni和Cu双掺杂取代Mn的Na_(0.6)7Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2).首先,由于Ni^(2+)/Ni^(4+)和Cu^(2+)/Cu^(3+)的氧化还原电位较高,所以在空气中不容易与H_(2)O和CO_(2)反应.并且,由于Ni和Cu取代了Mn,能缓解材料在循环过程中的Jahn-Teller效应.因此,制备的P2-Na_(0.67)Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2)具有较好的空气稳定性和循环稳定性.P2-Na_(0.67)Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2)在100 mA·g^(-1)下初始放电容量高达129.6 mAh·g^(-1),在循环50圈后仍有100.6 mAh·g^(-1)的放电比容量.P2-Na_(0.67)Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2)是一种极具潜力的钠离子电池正极材料.Due to its similar working mechanism with the lithium-ion battery,the sodium-ion battery has attracted extensive attention.However,the Jahn-Teller effect of Mn^(3+)on P2-Na_(0.67)MnO_(2) will result in both phase transition and structural collapse,thus leading to poor cycling performance.In addition,when stored in the air,H_(2)O and CO_(2) will easily react with it to form NaOH and Na2CO3.Therefore,in this study,the binary doping of Ni and Cu is designed to replace the Mn in Na_(0.6)7Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2).First of all,Ni^(2+)/Ni^(4+)and Cu^(2+)/Cu^(3+)have higher redox potentials,so it is not easy for them to react with H_(2)O and CO_(2) in the air.Moreover,the Jahn-Teller effect can be alleviated due to the substitution of Ni and Cu for the Mn.Therefore,the prepared P2-Na_(0.67)Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2) has good air and cycle stability.The initial discharge capacity of P2-Na_(0.67)Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2) at 100 mA·g^(-1) reaches up to 129.6 mAh·g^(-1),and the discharge specific capacity of 100.6 mAh·g^(-1) remains after 50 cycles.P2-Na_(0.67)Mn_(0.7)Ni_(0.2)Cu_(0.1)O_(2) is a promising cathode material for sodium-ion batteries.

关 键 词：JAHN-TELLER效应 掺杂 空气稳定性 钠离子电池 

分 类 号：TM242[一般工业技术—材料科学与工程]