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Anchoring Nickel and Stabilizing Oxygen in Coherent LiNiO2@LiFePO4 Composite Cathode Materials for Rechargeable
Zhichen Hou1, Wanying Wang2, Meng Yao1
1State 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.
Abstract:
LiNiO2 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 LiNiO2@LiFePO4 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 LiNiO2 surface stabilizes the Ni sites, mitigating surface reconstruction and lattice oxygen loss. The LiNiO2@LiFePO4 cathode exhibits a specific capacity of 210 mAh g-1 and an initial Coulombic efficiency of 93.7% at 0.1 C, along with a remarkable rate capability of 156 mAh g-1 at 10 C. Furthermore, the full cells pairing LiNiO2@LiFePO4 cathode and graphite anode deliver a considerable energy density over 280 Wh kg-1 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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