Gradient Mg and Uniform Ti Co-Doping Suppresses Jahn-Teller Effect in LMFP via Optimized Ion-Transport Kinetics and Interfacial Reactions.

Authors

Jixue Shen, Gaoqiang Mao, Qingchao Zeng, Xiaoyi Wang, Jia Gao, Jianzhong Xu, Wenhai Ji, Chao Ding, Götz Schuck, Zeheng Li, Tianpin Wu, Jun Lu

Published in

Angewandte Chemie (International ed. in English). Oct 27, 2026. Epub Oct 27, 2026.

Abstract

LiMn_0.6Fe_0.4PO₄ (LMFP), an olivine-type cathode material, is gaining attention in high-energy-density lithium-ion batteries due to its high operating voltage and cost-effectiveness. However, its practical use is limited by slow Li⁺ diffusion, poor electronic conductivity, and structural degradation caused by Jahn-Teller distortion from Mn³⁺. To tackle these challenges, we have developed a dry-and-wet synthesis method to produce Mg/Ti co-doped LMFP (Mg/Ti-LMFP). This approach ensures uniform Ti⁴⁺ doping at Fe sites and gradient Mg²⁺ doping at Li sites. Ti⁴⁺ strengthens the structural stability by forming M─O bonds, reducing Jahn-Teller distortion. Additionally, surface-enriched Mg²⁺ creates a protective layer, preventing manganese dissolution and electrolyte decomposition. The optimized structure and chemistry enhance Li⁺ transport kinetics, stability, electronic conductivity, and cycling durability. Mg/Ti-LMFP demonstrates 88.7% capacity retention after 200 cycles at 1C (25°C) and 88.2% after 100 cycles at 1C (55°C). This study lays a solid foundation for designing high-performance co-doped olivine-type cathode materials, guiding the development of future energy storage solutions.

PMID:
42935298
Bibliographic data and abstract were imported from PubMed on 27 Oct 2026.

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