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MnCo 2 O 4 /MoO 2 Nanosheets Grown on Ni foam as Carbon‐ and Binder‐Free Cathode for Lithium–Oxygen Batteries
Author(s) -
Cao Xuecheng,
Sun Zhihui,
Zheng Xiangjun,
Jin Chao,
Tian Jinhua,
Li Xiaowei,
Yang Ruizhi
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201702240
Subject(s) - cathode , materials science , electrochemistry , carbon fibers , lithium (medication) , chemical engineering , electrode , battery (electricity) , passivation , anode , nanotechnology , layer (electronics) , composite material , chemistry , medicine , power (physics) , physics , quantum mechanics , composite number , engineering , endocrinology
Carbon is usually used as cathode material for Li–O 2 batteries. However, the discharge product, such as Li 2 O 2 and LiO 2 , could react with carbon to form an insulating lithium carbonate layer, resulting in cathode passivation and capacity fading. To solve this problem, the development of non‐carbon cathodes is highly desirable. Herein, we successfully synthesized MnCo 2 O 4 (MCO) nanoparticles anchored on porous MoO 2 nanosheets that are grown on Ni foam (current collector) (MCO/MoO 2 @Ni), acting as a carbon‐ and binder‐free cathode for Li–O 2 batteries, in an attempt to improve the electrical conductivity, electrocatalytic activity, and durability. This MCO/MoO 2 @Ni electrode delivers excellent cyclability (more than 400 cycles) and rate performance (voltage gap of 0.75 V at 5000 mA g −1 ). Notably, the battery with this electrode exhibits a high energy efficiency (higher than 85 %). The advanced electrochemical performance of MCO/MoO 2 @Ni can be attributed to its high electrical conductivity, excellent stability, and outstanding electrocatalytic activity. This work offers a new strategy to fabricate high‐performance Li–O 2 batteries with non‐carbon cathode materials.