Subscriber access provided by Service des bibliothèques | Université de Sherbrooke
Article
The Li-rich layered/spinel heterostructured special morphology cathode material with high rate capability for Li-ion batteries Lanhua Yi, Zhongshu Liu, Ruizhi Yu, Caixian Zhao, Hongfeng Peng, Meihong Liu, Bing Wu, Manfang Chen, and Xianyou Wang ACS Sustainable Chem. Eng., Just Accepted Manuscript • DOI: 10.1021/ acssuschemeng.7b02906 • Publication Date (Web): 10 Oct 2017 Downloaded from http://pubs.acs.org on October 10, 2017
Just Accepted “Just Accepted” manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides “Just Accepted” as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. “Just Accepted” manuscripts appear in full in PDF format accompanied by an HTML abstract. “Just Accepted” manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). “Just Accepted” is an optional service offered to authors. Therefore, the “Just Accepted” Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these “Just Accepted” manuscripts.
ACS Sustainable Chemistry & Engineering is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.
Page 1 of 31
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
ACS Sustainable Chemistry & Engineering
The Li-rich layered/spinel heterostructured special morphology
cathode
material
with
high
rate
capability for Li-ion batteries Lanhua Yi
a*,
Zhongshu Liu a, Ruizhi Yu a, Caixian Zhao
b*,
Hongfeng Peng c,
Meihong Liu a, Bing Wu a, Manfang Chen a, Xianyou Wang a* a
Key Laboratory of Environmentally Friendly Chemistry and Applications of
Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105, China b
College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
c
Gold Shine Energy Material Co., Ltd., Changsha 410211, China
Corresponding author. Tel.: +86 731 58293719; fax: +86 731 58292477. E-mail address:
[email protected] (L. Yi),
[email protected] (C. Zhao),
[email protected] (X. Wang).
Abstract: Li-rich material 0.4Li2MnO3·0.6LiNi1/3Co1/3Mn1/3O2 with layered/spinel heterostructure is synthesized by a simple strategy. Based on structure and morphology analyses, it reveals the as-prepared Li-rich material possesses both porous micro-nano structure and integral layered-spinel heterostructure. Moreover, the obtained layered-spinel cathode material possesses prominent electrochemical characteristics, especially the rate capability. The initial discharge capacity of the as-prepared material is 269 mAh g-1 with a high coulombic efficiency of 90.3%. The material delivers discharge capacities of 239 mAh g-1 at 0.5 C, 195 mAh g-1 at 5 C, and 175.8 mAh g-1 even at 10 C. Besides, the capacity retention of cell is still as high 1
ACS Paragon Plus Environment
ACS Sustainable Chemistry & Engineering
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
as 80% at high current density (5C) after 200 cycles. The addition of spinel can inhibit the collaps of material structure and voltage fading upon the cycling. The 3D spinel Li4Mn5O12 phase in Li-rich compound could provide fast Li-ion diffusion pathway and the porous micro-nano structure which are the key parameters for the remarkable excellent electrochemical performance of the as-prepared cathode material.
Keywords：Lithium-ion batteries; Cathode material; Layered/spinel heterostructure; Porous-rod-like micro-nano structure; Electrochemical performance
Introduction With the rapid decrease of fossil fuels and the urgent need to resolve the environmental problems associated with fossil energy depletion, global warming, and environment pollution, renewable energy sources have received a great deal of worldwide attention.1,2 Nowadays, developing new green power sources are becoming increasingly important.3 Li-ion batteries (LIBs) have merits of high power density, high energy density and environmental friendliness, which have been regarded as one of the most promising energy storage devices for developing hybrid electric vehicles and electric vehicles. However, the major issues of low rate performances and poor cycle life need to be addressed before their large-scaled commercialization application.4 Improving the properties of the active cathode materials can promote the development of LIBs.5 Li-rich layered oxide materials, xLi2MnO3·(1-x)LiMO2 (M=Mn, Ni, Co, etc. 0
