Universität zu Köln

Yao, Di, Wu, Zongdeng, Song, Juanjuan, Cai, Li, Ouyang, Yu, Lei, Wu, Mathur, Sanjay ORCID: 0000-0003-2765-2693, Wu, Fengqin and Hao, Qingli (2020). Oxygen Vacancy Modulated LiMnxOy@C Three-Dimensional Nanosheet Arrays on Nickel Foam for Lithium-Ion Capacitor with High Performance. ACS Appl. Energ. Mater., 3 (5). S. 4840 - 4852. WASHINGTON: AMER CHEMICAL SOC. ISSN 2574-0962

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Abstract

The three-dimensional LiMnxOy@C (LMO@C) nanosheet arrays with rich oxygen vacancies were fabricated using a three-step method involving gamma-MnO2 electrodeposition on Ni foam combined with hydrothermal lithiation and carbon coating. The open-framework and porous structure of the LMO@C can remarkably facilitate the fast insertion/extraction of lithium-ion and charge transfer. The introduced oxygen vacancies and conducting carbon-shell can significantly improve the electrochemical property of an integrated electrode. The LMO@C electrode presents a higher mass capacitance (239.2 mAh g(-1) at 1 A g(-1)) and an enhanced cycling performance (nearly no decay after 10 000 cycles) compared with the LMO electrode. Additionally, a Li-ion capacitor (LIC) coin cell was assembled with Ni foam@LMO@C and activated carbon/Ni foam as the cathode and anode, respectively. The LIC can deliver 44.3 and 29.6 Wh kg(-1) energy density at the power density of 800 and 8000 W kg(-1), respectively, with superior cycling performance (80% capacitance retention after 4000 cycles). Thereby, the Ni foam@LMO@C electrode is promising for energy-storage devices due to its excellent electrochemical performance.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yao, Di UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Zongdeng UNSPECIFIED UNSPECIFIED UNSPECIFIED Song, Juanjuan UNSPECIFIED UNSPECIFIED UNSPECIFIED Cai, Li UNSPECIFIED UNSPECIFIED UNSPECIFIED Ouyang, Yu UNSPECIFIED UNSPECIFIED UNSPECIFIED Lei, Wu UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED Wu, Fengqin UNSPECIFIED UNSPECIFIED UNSPECIFIED Hao, Qingli UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-332853
DOI:	10.1021/acsaem.0c00436
Journal or Publication Title:	ACS Appl. Energ. Mater.
Volume:	3
Number:	5
Page Range:	S. 4840 - 4852
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2574-0962
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPINEL LIMN2O4 NANOWIRES; HYDROTHERMAL SYNTHESIS; CATHODE MATERIAL; ELECTRODEPOSITION; ELECTROLYTE; TEMPERATURE; BATTERY; NANOPARTICLES; STABILITY; ANODE Multiple languages Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/33285