Construction of Uniform Cobalt-Based Nanoshells and Its Potential for Improving Li-Ion Battery Performance

Jun-Yu Piao; Xiao-Chan Liu; Jinpeng Wu; Wanli Yang; Zengxi Wei; Jianmin Ma; Shu-Yi Duan; Xi-Jie Lin; Yan-Song Xu; An-Min Cao; Li-Jun Wan

doi:10.1021/acsami.8b08528

Construction of Uniform Cobalt-Based Nanoshells and Its Potential for Improving Li-Ion Battery Performance

ACS Appl Mater Interfaces. 2018 Jul 11;10(27):22896-22901. doi: 10.1021/acsami.8b08528. Epub 2018 Jun 28.

Authors

Jun-Yu Piao^{1

2}, Xiao-Chan Liu³, Jinpeng Wu^{4

5}, Wanli Yang⁴, Zengxi Wei⁶, Jianmin Ma⁶, Shu-Yi Duan^{1

2}, Xi-Jie Lin^{1

2}, Yan-Song Xu^{1

2}, An-Min Cao^{1

2}, Li-Jun Wan^{1

2}

Affiliations

¹ CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry , Chinese Academy of Sciences (ICCAS) , Beijing 100190 , China.
² University of Chinese Academy of Sciences (UCAS) , Beijing 100049 , China.
³ Shandong Provincial Key Laboratory for Special Silicone - Containing Materials, Advanced Materials Institute , Qilu University of Technology (Shandong Academy of Sciences) , Jinan 250014 , China.
⁴ Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
⁵ Geballe Laboratory for Advanced Materials , Stanford University , Stanford , California 94305 , United States.
⁶ College of Physics and Electronics , Hunan University , Changsha 410022 , China.

PMID: 29947502
DOI: 10.1021/acsami.8b08528

Abstract

Surface cobalt doping is an effective and economic way to improve the electrochemical performance of cathode materials. Herein, by tuning the precipitation kinetics of Co²⁺, we demonstrate an aqueous-based protocol to grow uniform basic cobaltous carbonate coating layer onto different substrates, and the thickness of the coating layer can be adjusted precisely in nanometer accuracy. Accordingly, by sintering the cobalt-coated LiNi_0.5Mn_1.5O₄ cathode materials, an epitaxial cobalt-doped surface layer will be formed, which will act as a protective layer without hindering charge transfer. Consequently, improved battery performance is obtained because of the suppression of interfacial degradation.

Keywords: LiNi0.5Mn1.5O4; coating; cobalt; lithium-ion batteries; surface doping.