Nasicon-Type Surface Functional Modification in Core-Shell LiNi0.5Mn0.3Co0.2O2@NaTi2(PO4)3 Cathode Enhances Its High-Voltage Cycling Stability and Rate Capacity toward Li-Ion Batteries

Longwei Liang; Xuan Sun; Chen Wu; Linrui Hou; Jinfeng Sun; Xiaogang Zhang; Changzhou Yuan

doi:10.1021/acsami.7b15808

Nasicon-Type Surface Functional Modification in Core-Shell LiNi_0.5Mn_0.3Co_0.2O₂@NaTi₂(PO₄)₃ Cathode Enhances Its High-Voltage Cycling Stability and Rate Capacity toward Li-Ion Batteries

ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5498-5510. doi: 10.1021/acsami.7b15808. Epub 2018 Jan 30.

Authors

Longwei Liang¹, Xuan Sun¹, Chen Wu¹, Linrui Hou¹, Jinfeng Sun¹, Xiaogang Zhang², Changzhou Yuan¹

Affiliations

¹ School of Material Science and Engineering, University of Jinan , Jinan 250022, P. R. China.
² College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, P. R. China.

PMID: 29357219
DOI: 10.1021/acsami.7b15808

Abstract

Surface modifications are established well as efficient methodologies to enhance comprehensive Li-storage behaviors of the cathodes and play a significant role in cutting edge innovations toward lithium-ion batteries (LIBs). Herein, we first logically devised a pilot-scale coating strategy to integrate solid-state electrolyte NaTi₂(PO₄)₃ (NTP) and layered LiNi_0.5Mn_0.3Co_0.2O₂ (NMC) for smart construction of core-shell NMC@NTP cathodes. The Nasicon-type NTP nanoshell with exceptional ion conductivity effectively suppressed gradual encroachment and/or loss of electroactive NMC, guaranteed stable phase interfaces, and meanwhile rendered small sur-/interfacial electron/ion-diffusion resistance. By benefiting from immanently promoting contributions of the nano-NTP coating, the as-fabricated core-shell NMC@NTP architectures were competitively endowed with superior high-voltage cyclic stabilities and rate capacities within larger electrochemical window from 3.0 to 4.6 V when utilized as advanced cathodes for advanced LIBs. More meaningfully, the appealing electrode design concept proposed here will exert significant impact upon further constructing other high-voltage Ni-based cathodes for high-energy/power LIBs.

Keywords: LiNi0.5Mn0.3Co0.2O2@NaTi2(PO4)3; core−shell architectures; high-voltage cathodes; lithium-ion batteries; surface modifications.