Anchoring Nickel and Stabilizing Oxygen in Coherent LiNiO@LiFePO Composite Cathode Materials for Rechargeable Lithium-Ion Batteries.

Adv Mater

State Key Laboratory of Advanced Power Sources, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Engineering Research Center of High-efficiency Energy Storage (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China.

Published: September 2025


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Article Abstract

LiNiO is an appealing cathode material for Li-ion batteries because of high energy density and low cost but suffers from irreversible phase transition and surface instability. Herein, a ball-milled LiNiO@LiFePO composite with oriented coherent combination is reported with enhanced structural stability and Li diffusion. The coherent oriented channels are demonstrated to favor the reversible and rapid Li intercalation during the H2-H3 phase transition, which significantly alleviates structural strain accumulation. The covalent P─O bonds anchored on the LiNiO surface stabilizes the Ni sites, mitigating surface reconstruction and lattice oxygen loss. The LiNiO@LiFePO cathode exhibits a specific capacity of 210 mAh g and an initial Coulombic efficiency of 93.7% at 0.1 C, along with a remarkable rate capability of 156 mAh g at 10 C. Furthermore, the full cells pairing LiNiO@LiFePO cathode and graphite anode deliver a considerable energy density over 280 Wh kg and a remarkable capacity retention. This study offers an effective approach of phosphate coalesce to upgrade high-capacity nickel-rich oxide cathode materials.

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http://dx.doi.org/10.1002/adma.202509213DOI Listing

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