Enhancing the Electrochemical Performance of High Voltage LiNi0.5Mn1.5O4 Cathode Materials by Surface Modification with Li1.3Al0.3Ti1.7(PO4)3/C

Tingting Yang; Chi-Te Chin; Ching-Hsiang Cheng; Jinsheng Zhao

doi:10.3390/nano13040628

Enhancing the Electrochemical Performance of High Voltage LiNi_0.5Mn_1.5O₄ Cathode Materials by Surface Modification with Li_1.3Al_0.3Ti_1.7(PO₄)₃/C

Nanomaterials (Basel). 2023 Feb 5;13(4):628. doi: 10.3390/nano13040628.

Authors

Tingting Yang^{1

2}, Chi-Te Chin^{1

2

3}, Ching-Hsiang Cheng^{1

2

3}, Jinsheng Zhao⁴

Affiliations

¹ School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China.
² Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China.
³ Hubei Research Center for New Energy & Intelligent Connected Vehicle, Wuhan University of Technology, Wuhan 430070, China.
⁴ College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.

Abstract

A novel method for surface modification of LiNi_0.5Mn_1.5O₄ (LNMO) was proposed, in which a hybrid layer combined by Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) and carbon (C) composite on LNMO material were connected by lithium iodide. Structure and morphology analyses illustrated that a higher contact area of active substances was achieved by the LATP/C composite layer without changing the original crystal structure of LNMO. XPS analysis proved that I^- promoted the reduction of trace Mn⁴⁺, resulting in a higher ion conductivity. Galvanostatic charge-discharge tests exhibited the capacity of the LNMO with 5% LATP/C improved with 35.83% at 25 °C and 95.77% at 50 °C, respectively, compared with the bare after 100 cycles, implying the modification of high-temperature deterioration. EIS results demonstrated that one order of magnitude of improvement of the lithium-ion diffusion coefficient of LATP/C-LNMO was achieved (3.04 × 10^-11 S cm^-1). In conclusion, the effective low-temperature modification strategy improved the ionic and electronic conductivities of the cathode and suppressed the side reactions of high-temperature treatment.

Keywords: LATP/C composite; LiNi0.5Mn1.5O4 cathode; lithium iodide; low temperature; solvent recrystallization.

Grants and funding

The work was supported by research funding [Project name “211 Project” Special Funding, Project Account Code (#40120411)]; the 111 project (B17034) and Innovative Research Team Development Program of Ministry of Education of China (IRT_17R83).