Exposing the {010} Planes by Oriented Self-Assembly with

Jan 31, 2018 - A modified Ni-rich Li[Ni0.8Co0.1Mn0.1]O2 cathode material with exposed {010} planes is successfully synthesized for lithium-ion batteri...
0 downloads 8 Views 2MB Size
Subscriber access provided by READING UNIV

Article

Exposing the {010} planes by oriented self-assembling with nanosheets to improve the electrochemical performances of Ni-rich Li[Ni0.8Co0.1Mn0.1]O2 microspheres Yuefeng Su, Gang Chen, Lai Chen, Weikang Li, Qiyu Zhang, Zhiru Yang, Yun Lu, Liying Bao, Jing Tan, Renjie Chen, Shi Chen, and Feng Wu ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.7b18933 • Publication Date (Web): 31 Jan 2018 Downloaded from http://pubs.acs.org on February 1, 2018

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 Applied Materials & Interfaces 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 28 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 Applied Materials & Interfaces

Exposing the {010} planes by oriented self-assembling with nanosheets to improve the electrochemical performances of Ni-rich Li[Ni0.8Co0.1Mn0.1]O2 microspheres Yuefeng Su

†, a, b, c

Yang a, Yun Lu

, Gang Chen

†, a

, Lai Chen

*, a

, Weikang Li a, Qiyu Zhang a, Zhiru

a, b, c

, Liying Bao a, b, c, Jing Tan d, Renjie Chen a, b, c, Shi Chen a, b, c and

Feng Wu a, b, c a

Beijing Key Laboratory of Environmental Science and Engineering, School of

Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China. b

Collaborative Innovation Center for Electric Vehicles in Beijing, Beijing, 100081,

PR China c

National Development Center of High Technology Green Materials, Beijing, 100081,

PR China d

School of Chemistry and Chemical Engineering, Beijing Institute of Technology,

Beijing 100081, PR China

Keywords: Li[Ni0.8Co0.1Mn0.1]O2; Ni-rich cathode material; active {010} planes; self-assembly; high-rate performance

ACS Paragon Plus Environment

ACS Applied Materials & Interfaces 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

Abstract: A modified Ni-rich Li[Ni0.8Co0.1Mn0.1]O2 cathode material with exposed {010} planes is successfully synthesized for lithium-ion battery. The SEM images have demonstrated that, through tuning the ammonia concentration during the synthesis of precursors, the primary nanosheets could be successfully stacked along the [001] crystal axis predominantly, self-assembling like multi-layers. According to the HRTEM results, such a morphology benefits the growth of {010} active planes of final layered cathodes during calcination treatment, resulting in increased area of exposed {010} active planes, well-ordered layer structure, and lower cation mixing disorder. The Li-ion diffusion coefficient also has been improved after the modification based on the results of PITT. As a consequence, the modified Li[Ni0.8Co0.1Mn0.1]O2 material exhibits superior initial discharge of 201.6mAh g-1 at 0.2 C and 185.7mAh g-1 at 1 C within 2.8-4.3V (vs. Li+/Li), and their capacity retentions after 100 cycles reach 90% and 90.6% respectively. The capacity at 10 C also increases from 98.3 to 146.5 mAh g-1 after the modification. Our work proposes a novel approach for exposing high-energy {010} active planes of layered cathode material, and again confirms its validity in improving electrochemical properties.

1. INTRODUCTION The exhaustion of energy resources has led to significant development of new energy storage devices. Lithium-ion battery (LIB) has attracted much attention due to its high energy density, high capacity, good cycling stability and environmentally friendly property.1-2 It has been successfully applied in 3C (computer, communication and consumer electronics) products.3 Nowadays, layered Li[NixCoyMn1-x-y]O2 (0