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DOI: https://doi.org/10.6023/A25030072

Article

Effect of ferroelastic Zr0.92Y0.08O2 on the properties of the layered LiMnO2 cathode materials

  • LU Jicheng ,
  • GOU Lei ,
  • LIU Xiaojiu ,
  • FANG Xiaoyong ,
  • LI Donglin
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  • aNew Energy Materials and Devices Laboratory, School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China;
    bCollege of Chemistry and Chemical Engineering, Tarimu University, Alar, Xingjiang 843300, China

Received date: 2025-03-12

  Online published: 2025-06-20

Supported by

national natural science of Foundation of China(No.22179011; No.21473014).; Xianyang City's Qinchuangyuan Special Project for Scientific and Technological Innovation (Approval Number:L 2022-QCYZX-GY-005)

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Abstract

Layered LiMnO₂ (LMO) with an orthorhombic structure is an abundant and inexpensive manganese-based cathode material for lithium-ion batteries, but it suffers from challenges such as poor charge-discharge cycle stability. To address this issue, nanoscale Y-stabilized ZrO2 (Zr0.92Y0.08O2, YSZ) is coated on LiMnO2 crystallites by a wet-chemical method to improve its charge-discharge cycle performance in this paper. XRD and TEM analyses show that YSZ in the synthesized material has a tetragonal structure with a size distribution of 3-15 nm, coating LMO particles as thin layers or particles to form LMO@YSZ nanocomposites. HRTEM analysis reveals the presence of 90° ferroelastic domains in the tetragonal phase within the nanoscale YSZ surrounding LMO particles. Charge-discharge tests demonstrate that the maximum discharge capacity is 192 mAh·g-1 at a current density of 20 mA·g-1. After 300 cycles at 200 mA·g-1, the capacity of the LMO@YSZ composite remains at 59% of its maximum capacity, significantly suppressing the decay of charge-discharge specific capacity compared to 36% for pure LiMnO₂. SEM observations reveal that after 300 charge-discharge cycles, the uncoated LMO electrode contains cracks approximately 700 nm wide and over 40 μm long, which interweave to form isolated "island-like" regions in the electrode. In contrast, cracks are hardly observable in the YSZ-coated electrode, with particles in close contact. The number of cracks in the LMO@YSZ composite electrode are significantly suppressed. Considering ferroelastic domains in YSZ of the composite, it is inferred that the improved charge-discharge cycle performance of the LMO@YSZ composite is attributed to reduced or inhibited cracking from the experimental results. This may originate from the electrochemical-ferroelastic coupling effect between the LMO cathode material and YSZ ferroelastic material during charge-discharge processes, delivering stress energy in LMO to YSZ. As a result, the ferroelastic properties of YSZ dissipate the stress energy in the cathode material, effectively suppressing crack generation in the electrode without hindering electron and lithium-ion diffusion, thereby improving the charge-discharge cycle performance of the LiMnO₂ electrode.

Key words： LiMnO2; Y-stabilized ZrO2; cathode materials; ferroelastic materials; lithium-ion battery

Cite this article

LU Jicheng , GOU Lei , LIU Xiaojiu , FANG Xiaoyong , LI Donglin . Effect of ferroelastic Zr0.92Y0.08O2 on the properties of the layered LiMnO2 cathode materials[J]. Acta Chimica Sinica, 0 : 3 -3 . DOI: 10.6023/A25030072

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