Boron-Catalyzed Graphitization Carbon Layer Enabling LiMn 0.8 Fe 0.2 PO 4 Cathode Superior Kinetics and Li-Storage Properties

• Published in: Small methods Vol. 7; no. 2; p. e2201390
• Main Authors: Zeng, Taotao, Hu, Zhuang, Zhou, Zeyan, Fan, Changling, Zhang, Fuquan, Liu, Jinshui, Liu, Dai-Huo
• Format: Journal Article
• Language: English
• Published: Germany 01.02.2023
• Subjects: graphite-like BC 3; graphitization carbon; boron-catalyzed graphitization; LiMn 0.8Fe 0.2PO 4; electrode kinetics
• ISSN: 2366-9608
• DOI: 10.1002/smtd.202201390

The poor electrode kinetics and low conductivity of the LiMn Fe PO cathode seriously impede its practical application. Here, an effective strategy of boron-catalyzed graphitization carbon coating layer is proposed to stabilize the nanostructure and improve the kinetic properties and Li-storage capability of LiMn Fe PO nanocrystals for rechargeable lithium-ion batteries. The graphite-like BC is derived from B-catalyzed graphitization coating layers, which can not only effectively maintain the dynamic stability of the LiMn Fe PO nanostructure during cycling, but also plays an important role in enhancing the conductivity and Li migration kinetics of LiMn Fe PO @B-C. The optimized LiMn Fe PO @B-C exhibits the fastest intercalation/deintercalation kinetics, highest electrical conductivity (8.41 × 10 S cm ), Li diffusion coefficient (6.17 × 10 cm s ), and Li-storage performance among three comparison samples (B-C0, B-C6, and B-C9). The highly reversible properties and structural stability of LiMn Fe PO @B-C are further proved by operando XRD analysis. The B-catalyzed graphitization carbon coating strategy is expected to be an effective pathway to overcome the inherent drawbacks of the high-energy density LiMn Fe PO cathode and to improve other cathode materials with low-conductivity and poor electrode kinetics for rechargeable second batteries.