Three-dimensional porous CoO-CoO@GO composite combined with N-doped carbon for superior lithium storage.

Author(s) Xu, Y.; Wu, C.; Ao, L.; Jiang, K.; Shang, L.; Li, Y.; Hu, Z.; Chu, J.
Journal Nanotechnology
Date Published 2019 Oct 18
Abstract

Transition metal oxides (TMOs) as anode materials have potential for lithium-ion batteries (LIBs). However, the poor rate capacity and cycle stability restrict its application. Herein, we demonstrate a facile one-step hydrothermal method to construct a three-dimensional porous conductive network structure, which consists of thin-layered graphene, ultrafine CoO-CoO nanoparticles and nitrogen-doped carbon. This unique structure can effectively prevent particle agglomeration and cracking caused by volume expansion, provide fast passage for lithium ion/electron transport during cycling and improve the electrical conductivity of the electrode. Moreover, the electrochemical kinetic analysis proves that this is a process dominated by pseudocapacitive behavior. Consequently, the N-C@CoO-CoO@GO hybrid electrode delivers an ultrahigh capacity of 1 273.1 mA h g at 0.1 A g and superior rate performance (725.1 mA h g at 5 A g). Additionally, it exhibits a high reversible cycling capacity of 787.4 mA h g at 1 A g over 600 cycles and even maintains excellent cycling stability for a ultra-long cycles at 5 A g. This work provides a feasible strategy for fabricating the N-C@CoO-CoO@GO composite as a promising high-performance TMOs anode for LIBs.

DOI 10.1088/1361-6528/ab3070
ISSN 1361-6528
Citation Xu Y, Wu C, Ao L, Jiang K, Shang L, Li Y, et al. Three-dimensional porous CoO-CoO@GO composite combined with N-doped carbon for superior lithium storage. Nanotechnology. 2019;30(42):425404.