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Optimized Nickel Aluminate Surface Coating to Enhance the Electrochemical Stability of LiMn2O4 Cathode Materials for Li-Ion Batteries
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DOI：10.1002/est2.70425.png)
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Abstract
En 中文
Spinel lithium-manganate, known as LiMn2O4 (LMO), is extensively utilized in high-voltage lithium-ion batteries (LIBs). Nevertheless, these materials face major issues, including limited cyclability, insufficient capacity retention, and poor rate capability, mainly due to manganese dissolution and structural distortion. This work presents a method to address these challenges by coating LMO cathodes with a thin layer of NixAlyOz (NAO) spinel oxide using a scalable sol–gel method, thereby minimizing Mn dissolution and Jahn–Teller distortion. The shape-controlled truncated octahedron LMO cathodes, featuring a preferred crystal plane orientation that enhances lithium-ion diffusion, are derived from pre-synthesized α-MnO2 nanostructures. LMO surfaces were coated with NAO at 1%, 2%, and 3% by weight. These modified LMO cathodes exhibit improved cycle stability over 3.0–4.5 V. The LMO cathode with 3% NAO coating maintained 98.8% capacity retention after 500 charge/discharge cycles, versus pristine LMO retaining only 56.88% after 500 cycles at a 1C rate. This performance stems from a dual-phase design integrating truncated octahedral LMO with an orthorhombic nickel aluminate surface layer at 1–3 wt % loading, providing suppression of Mn dissolution and structural degradation under high-voltage operation.
Keywords:
cathode materials
Jahn–Teller distortion
Li-ion battery
LiMn2O4
surface coating
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