Li-rich layered cathode is successfully prepared by the co-precipitation method, and subsequent surface modification of amorphous Fe₂O₃ coating is conducted to promote the cycling durability. The results reveal that amorphous Fe₂O₃ is well distributed on the secondary particles and does not change the intrinsic layered structure of the cathode material accordingly. Surface modification of Fe₂O₃ improves the initial coulomb efficiency, cycle stability, and rate capacity of the layered cathode. Especially, the 2 wt% Fe₂O₃ coated cathode material exhibits the highest initial discharge capacity of 267.5 mAh g⁻¹ at 0.1C and still remains 139.3 mAh g⁻¹ at 5C. Moreover, a capacity retention of 87.7% could be delivered even after 300 cycles at 1C on the 2 wt% Fe₂O₃ coated cathode, displaying distinctly high structural integrity and cycling stability, while the value of the pristine sample reaches only 70.8%. Meanwhile, the Fe₂O₃ coating stabilizes the electrode/electrolyte interface and lowers the charge transfer resistance. The above features after the introduction of the Fe₂O₃ protective layer could be ascribed to the suppression of the direct contract and corrosion of the cathode with the electrolyte, which effectively accelerates the Li⁺ diffusion and inhibits the transition from layered to spinel structure.

通过共沉淀法成功制备了富锂层状阴极，随后进行了非晶态Fe ₂ O ₃涂层的表面改性，以提高循环寿命。结果表明，无定形的Fe ₂ O ₃很好地分布在次级颗粒上，并且不会相应地改变阴极材料的本征层状结构。Fe ₂ O _3的表面改性改善了层积阴极的初始库仑效率，循环稳定性和倍率容量。尤其是，涂覆有2 wt％Fe ₂ O _3的正极材料具有267.5 mAh g ^-1的最高初始放电容量在0.1C下仍保持139.3 mAh g ^-1在5C下。而且，即使在2wt％的Fe ₂ O ₃涂覆的阴极上在1℃下进行300次循环之后，仍可以达到87.7％的容量保持率，显示出明显高的结构完整性和循环稳定性，而原始样品的值仅达到70.8％。同时，Fe ₂ O ₃涂层使电极/电解质界面稳定并降低了电荷转移电阻。引入Fe ₂ O ₃保护层后的上述特征可归因于抑制电解质的直接收缩和阴极的腐蚀，从而有效地加速了Li ⁺ 扩散并抑制从分层到尖晶石结构的转变。