DataVXACS Energy LettersPaper
journal article·2025-12-12

Self-Compensated and Air-Stable P2-Type Layered Cathode for Practical Sodium-Ion Batteries

Yuansheng Shi, Yifan Xu, Jiaqi Cao, Pengfeng Jiang, Fushan Geng, Chade Lv, Ju Zhao, Weixin Chen, Dilxat Muhtar, Erhai Hu, Dongshuang Wu, Jinfeng Dong, Okkyun Seo, Jialu Li, Jinghua Guo, Yang Sun, Xia Lu, Qingyu Yan

ACS Energy Letters· Volume 10· Issue 12
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Source abstract

Abstract

Sodium-based P2-type layered cathodes are of interest for sodium-ion batteries due to their fast Na + transport and good cycling reversibility at elevated voltages. However, their low sodium content and irreversible Na loss on the anode side limit their practical use. Here, a self-compensated P2-Na 0.8 Li 0.06 □ 0.04 Ni 0.23 Mn 0.67 O 2 (P2-NLNM-Va) is developed with approximately 4% cation vacancies in the transition metal layer to regulate lattice oxygen activity during charge and counterbalance anode-side Na loss. The vacancies activate additional charge capacity without sacrificing discharge capacity, rate capability, or air/cycling stability. As a result, the full cells of P2-NLNM-Va//hard carbon exhibit an initial discharge capacity of 100.6 mAh/g and retain 83% capacity after 300 cycles, compared with 80.2 mAh/g and 62% for the vacancy-free counterpart. This self-compensation strategy raises energy density by about 20% to 245 Wh/kg (total mass of cathode and anode), offering a route toward practical P2-type oxide-based sodium-ion batteries.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

School of Materials

Sun Yat-sen University

Shanghai Key Laboratory of Magnetic Resonance, Institute of Magnetic Resonance and Molecular Imaging in Medicine, School of Physics and Electronic Science

East China Normal University

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering

Harbin Institute of Technology

Center for Synchrotron Radiation Research

Japan Synchrotron Radiation Research Institute (JASRI)

The Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States

Funding

Agency for Science, Technology and Research · Ministry of Education of the People's Republic of China · National Research Foundation Singapore · National Natural Science Foundation of China · Indonesia-NTU Singapore Institute of Research for Sustainability and Innovation

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