Enhanced Electrochemical Performance of a Ti-Cr-Doped LiMn1.5Ni0.5O4 Cathode Material for Lithium-Ion Batteries

Yiyuan Luo; Zhou Cui; Changxu Wu; Baisheng Sa; Cuilian Wen; Hengyi Li; Jianping Huang; Chao Xu; Zhengbing Xu

doi:10.1021/acsomega.3c01524

Enhanced Electrochemical Performance of a Ti-Cr-Doped LiMn_1.5Ni_0.5O₄ Cathode Material for Lithium-Ion Batteries

ACS Omega. 2023 Jun 14;8(25):22721-22731. doi: 10.1021/acsomega.3c01524. eCollection 2023 Jun 27.

Authors

Yiyuan Luo^{1

2

3}, Zhou Cui⁴, Changxu Wu⁴, Baisheng Sa⁴, Cuilian Wen⁴, Hengyi Li⁵, Jianping Huang³, Chao Xu⁶, Zhengbing Xu^{1

2}

Affiliations

¹ State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning 530004, P. R. China.
² Centre of Ecological Collaborative Innovation for Aluminum Industry in Guangxi, Guangxi University, Nanning 530004, P. R. China.
³ Sanming New Energy Industry Technology Institute, Sanming 365007, P. R. China.
⁴ Multiscale Computational Materials Facility, and Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Fuzhou 350100, P. R. China.
⁵ Fujian Applied Technology Engineering Center of Power Battery Materials, Fujian College of Water Conservancy and Electric Power, Sanming 366000, P. R. China.
⁶ Xiamen Talentmats New Materials Science & Technology Co., Ltd., Xiamen, Fujian 361015, P. R. China.

Abstract

Ti, Cr dual-element-doped LiMn_1.5Ni_0.5O₄ (LNMO) cathode materials (LTNMCO) were synthesized by a simple high-temperature solid-phase method. The obtained LTNMCO shows the standard structure of the Fd3®m space group, and the Ti and Cr doped ions may replace the Ni and Mn sites in LNMO, respectively. The effect of Ti-Cr doping and single-element doping on the structure of LNMO was studied by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) characteristics. The LTNMCO exhibited excellent electrochemical properties with a specific capacity of 135.1 mAh·g^-1 for the first discharge cycle and a capacity retention rate of 88.47% at 1C after 300 cycles. The LTNMCO also has high rate performance with a discharge capacity of 125.4 mAh·g^-1 at a 10C rate, 93.55% of that at 0.1C. In addition, the CIV and EIS results show that the LTNMCO showed the lowest charge transfer resistance and the highest diffusion coefficient of lithium ions. The enhanced electrochemical properties may be due to a more stable structure and an optimized Mn³⁺ content in LTNMCO through TiCr doping.