锰掺杂二氧化钛纳米片为正极催化剂制备高性能锂空气电池  

Synthesis of Manganese-Doped TiO2 Nanosheet as Cathode Catalyst for Rechargeable Li–O2 Batteries with High Performance

作　　者：王泓蛟 王慧[1] 曹慧群[1] 罗仲宽[1] 王芳[1] Wang Hongjiao;Wang Hui;Cao Huiqun;Luo Zhongkuan;Wang Fang(Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学,广东深圳518060

出　　处：《稀有金属材料与工程》2020年第4期1119-1125,共7页Rare Metal Materials and Engineering

基　　金：Shenzhen Science and Technology Fund(JCYJ20170818095803319)。

摘　　要：使用Mn掺杂的TiO2纳米片(Mn-TiO2纳米片)作为阴极催化剂来改善锂-空气电池的电化学性能。首先,通过简单的水热方法处理煅烧过的金红石制备Mn-TiO2纳米片;其次,将聚偏氟乙烯(PVDF)溶于N-甲基-2-吡咯烷酮(NMP)溶剂中,然后将KB和Mn-TiO2纳米片与PVDF/NMP溶液混合,制备正极悬浮液。最后,将正极悬浮液涂覆到碳纸上(直径15 mm),并在60℃烘箱里烘干3 h,获得Mn-TiO2纳米片正极。正如预期,在250 mA·g^-1的电流密度下,KB和Mn-TiO2纳米片作为锂-空气电池的电极表现出较低的过电势(1.24V)和较高的放电容量(9374.23 mAh·g^-1)。这表明Mn-TiO2纳米片作为锂空气电池正极催化剂具有极大的应用前景。We proposed that Mn-doped TiO2 nanosheets(Mn-TiO2 NS)as cathode catalyst improved the electrochemical performance of lithium-air batteries.Firstly,rutile Mn-TiO2 NS were calcined by a facile hydrothermal treatment method.Secondly,polyvinylidene fluoride(PVDF)was dissolved in an N-methyl-2-pyrrolidone(NMP)solvent.KB and Mn-TiO2 NS were mixed with a PVDF/NMP solution to fabricate a cathode slurry.Lastly,the cathode slurry was coated onto circular carbon paper(diameter=15 mm)and dried at 60℃for 3 h in the oven to obtain the air cathode.As expected,lithium-air cells based on KB and Mn-TiO2 NS electrode exhibit an improved overpotential of 1.24 V and a high discharge capacity of 9374.23 mAh·g^-1 at the current density of 250 mA·g^-1.It suggests that Mn-TiO2 NS is a promising catalyst for Li-O2 batteries.

关 键 词：Mn-TiO2纳米片 催化效应 KB 高性能 锂空气电池 

分 类 号：TM911.41[电气工程—电力电子与电力传动] O643.36[理学—物理化学]