Redox Couple Strategy for Improving the Oxygen Redox Activity and Reversibility of Li- and Mn-Rich Cathode Materials
The specific capacity of Li- and Mn-rich layered oxide (LMROs) cathodes can be enhanced by the oxidation of lattice oxygen at high voltages. Nevertheless, an irreversible oxygen loss emerges with cycling, which triggers interlocking surface/interface issues and results in the fast deterioration of cycling performance. Herein, we prepare a surface modified LMRO electrode by one step doctor-blade casting and introducing a benzoquinone species DBBQ redox couple. The electrochemical test shows that the DBBQ-modified electrode has a high reversible capacity (>320 mAh g<sup>-1</sup>) and excellent rate performance, while the cyclic stability has been significantly improved as well. The capacity retention reaches as high as 93.3% after 500 cycles at 1 C. Mechanism analysis shows that DBBQ can not only play a redox couple in LMROs which achieves the adsorption and reduction of surface oxygen gas but also significantly enhance anionic redox in the bulk, thus realizing extraordinary capacity.
Authors
- Liaona She (ORCID: https://orcid.org/0009-0003-3248-3502)
- Xuebin Yu (ORCID: https://orcid.org/0000-0002-4035-0991)
- Yue Lin (ORCID: https://orcid.org/0000-0001-5333-511X)
- Hongge Pan (ORCID: https://orcid.org/0000-0002-7582-3744)
- Mingxia Gao (ORCID: https://orcid.org/0000-0002-4719-6747)
- Yaxiong Yang (ORCID: https://orcid.org/0009-0005-0420-4953)
- Yinzhu Jiang (ORCID: https://orcid.org/0000-0003-0639-2562)
- Zhijun Wu (ORCID: https://orcid.org/0000-0001-8910-5674)
- Panyu Gao
- Chenhui Yan (ORCID: https://orcid.org/0000-0002-5440-9536)
- Xin Zhang (ORCID: https://orcid.org/0000-0002-2202-7496)
- Yongfeng Liu (ORCID: https://orcid.org/0000-0002-4002-8265)
- Wenping Sun (ORCID: https://orcid.org/0000-0003-3021-6382)
Institutions
- University of Science and Technology of China (CN)
- Fudan University (CN)
- Hefei National Center for Physical Sciences at Nanoscale (CN)
- Xi'an Technological University (CN)
- Division of Materials Science and Engineering (AU)
- Microscale (United States) (US)
- Zhejiang University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-10-16
- DOI
- https://doi.org/10.1021/acs.nanolett.4c02588
- Citations
- 5
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- National Natural Science Foundation of China
- National Outstanding Youth Foundation of China
- National Key Research and Development Program of China