纳微快报（英文）2021，Vol.13Issue(11)：203-214,12.
Oxygen-Deficient β-MnO2@Graphene Oxide Cathode for High-Rate and Long-Life Aqueous Zinc Ion Batteries
Oxygen?Deficient β?MnO2@Graphene Oxide Cathode for High?Rate and Long?Life Aqueous Zinc Ion Batteries
摘要
Abstract
Recent years have witnessed a booming interest in grid-scale electrochemical energy storage, where much attention has been paid to the aqueous zinc ion batteries (AZIBs). Among various cathode materials for AZIBs, manganese oxides have risen to prominence due to their high energy density and low cost. However, sluggish reaction kinetics and poor cycling stability dictate against their practical application. Herein, we demonstrate the combined use of defect engineering and interfacial optimization that can simultaneously promote rate capability and cycling stability of -MnO2 cathodes.β-MnO2 with abundant oxygen vacancies -(VO) and graphene oxide (GO) wrapping is synthesized, in which -VO in the bulk accelerate the charge/discharge kinetics while GO on the surfaces inhibits the Mn dissolution. This electrode shows a sustained reversible capacity of ～ 129.6 mAh -g?1 even after 2000 cycles at a current rate of 4C, outperforming the state-of-the-art -MnO2-based cathodes. The superior performance can be rationalized by the direct interaction between surface -VO and the GO coating layer, as well as the regulation of structural evolution of β-MnO2 during cycling. The combinatorial design scheme in this work offers a practical pathway for obtaining high-rate and long-life cathodes for AZIBs.关键词
Manganese oxides/Oxygen defects/Surface optimization/Aqueous zinc batteryKey words
Manganese oxides/Oxygen defects/Surface optimization/Aqueous zinc battery引用本文复制引用
Shouxiang Ding,Lu Yao,Shunning Li,Qinghe Zhao,Feng Pan,Mingzheng Zhang,Runzhi Qin,Jianjun Fang,Hengyu Ren,Haocong Yi,Lele Liu,Wenguang Zhao,Yang Li..Oxygen-Deficient β-MnO2@Graphene Oxide Cathode for High-Rate and Long-Life Aqueous Zinc Ion Batteries[J].纳微快报（英文）,2021,13(11):203-214,12.基金项目
This work is financially supported by the Stable Support Funding for Universities in Shenzhen(Nos.GXWD20201231165807007-20200807111854001). （Nos.GXWD20201231165807007-20200807111854001）
