Probing the microstructural changes in Li-rich layered oxides induced by over-lithiation
Li-rich manganese-based layered oxides (LRMO) cathode materials can deliver a high specific capacity of approximately 400 mAh g<sup>-1</sup> under deep discharge conditions; however, they suffer from severe capacity degradation. In this work, the crystal structure evolution and strain variations of Li<sub>1.2</sub>Ni<sub>0.2</sub>Mn<sub>0.6</sub>O<sub>2</sub> cathode materials within a wide voltage range (1.0-4.8 V) were systematically investigated using synchrotron X-ray diffraction (sXRD). As the voltage decreases below 2.0 V, the LRMO materials exhibit significant changes in microstrain, while variations in lattice parameters and unit-cell volume remain relatively small. These results indicate that the rapid capacity fading is primarily attributed to the accumulation of strain during over-lithiation.
Authors
- Xiaoxia Yang (ORCID: https://orcid.org/0000-0001-6464-4081)
- Xinyue Zhai
- Weibo Hua (ORCID: https://orcid.org/0000-0001-5372-4422)
- Yifan Wang (ORCID: https://orcid.org/0000-0001-9966-682X)
- Jianqiang Hu (ORCID: https://orcid.org/0000-0002-0667-970X)
- Qin Wang (ORCID: https://orcid.org/0000-0001-8466-475X)
Institutions
- Guangdong University of Technology (CN)
- Taiyuan University of Science and Technology (CN)
- Xi'an Jiaotong University (CN)
- South China University of Technology (CN)
Publication Details
- Journal
- Chemical Communications
- Published
- 2025-12-02
- DOI
- https://doi.org/10.1039/d5cc06461a
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00