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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
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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
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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
