富鎳層狀材料因其具高的比電容量（約220 mAh / g）而備受期待。然而其具有一些缺點，例如熱穩定性差、易於與電解液發生副反應，電容量快速下降，阻礙了其商業化的發展。本研究使用兩種不同的表面塗覆方法穩定富鎳材料，並使用穩定之金屬氧化物層，作為人工固態電解質界面層。因此，富鎳陰極材料將不會與液體電解質直接接觸，並且可以減少副反應發生之可能。此外，還期望在充電和放電過程中降低過渡金屬之溶解，使界面穩定性提高。因此可以預期電池的電化學性能增強。
使用了兩種表面塗覆方法。第一個是機械塗層（即機械融合）。其原理是將剪切應力施加到奈米金屬氧化物上，以覆蓋陰極粉末的表面，在其中測試了不同的混合比例和塗覆時間。分別測試了鈮酸鋰和鋯酸鋰作為二次粒子表面之塗層。仔細檢查參數和材料的影響，以確保電阻的增加最小化。第二種方法是自創之濕式原子塗覆方法，該方法使用Sol-Gel方法的原理，將鈮酸鋰/鋯酸鋰塗覆在NCM二次粒子表面上。希望獲得比機械融合更完整，更光滑的塗層。實驗結果顯示，塗有鈮酸鋰/鋯酸鋰的粉末在高倍率放電（0.5 C）下具有出色的穩定性。 100次循環後，電容量保持率高於85％。鋯酸鋰塗佈之粉末甚至可以達到90.66％，遠遠超出改質前的樣品。與改質之前相比，具塗覆的材料在更高的電位下也更穩定。
與機械和化學塗覆方法相比，前一種方法有更多的限制。例如，塗佈時間不能太長，並且需要更大量的原料，但是操作更快且方便。相比之下，化學塗佈法生產靈活，並且儘管需要更長時間的操作，但能夠確保完整的表面包覆。
關鍵字 : 富鎳層狀材料、正極材料、表面改質、機械式包覆、濕式原子包覆法、人工固態電解質界面、界面穩定性

Nickel-rich layered cathode materials are highly expected because of their high specific capacitance, about 220 mAh/g. However, some disadvantages, such as poor thermal stability, prone to side reactions with electrolyte, rapid decline in capacity, have impeded its commercialization. This study was envisaged to use two different surface coating methods to coat the nickel-rich materials with a stable metal oxide layer to endow an artificial solid electrolyte interface layer. Thus, the nickel-rich cathode materials would not be in direct contact with the liquid electrolyte, and possible side reactions could be reduced. Further, the dissolution of transition metal during the charge and discharge processes is also expected to decrease, and the interfacial stability improves. So enhanced electrochemical properties of the cell with Ni-rich layered oxide cathode could be expected.
Two surface coating methods were used. The first one is the mechanical coating (i.e., mechanofusion). Its principle is to apply the shear stress to the nano-sized metal oxide to cover the surface of cathode powders, where different mixing ratios and coating time were parameters tested. The lithium niobate and lithium zirconate were tested as the coating on the surface of the secondary particles, respectively. The effects of parameters and materials were scrutinized to ensure the minimum increase in resistance. The second method is the newly proposed wet atomic layer deposition (Wet-ALD) method, which uses the principle of a Sol-Gel method to coat the lithium niobate/lithium zirconate on the surface of the NCM secondary particles. It was hoped to achieve a complete and smoother coating by the Wet-ALD method than the mechanofusion. The experimental results showed that the powder coated with lithium niobate/lithium zirconate has excellent stability under high rate discharge (0.5 C). After 100 cycles, the capacity retention rate was higher than 85%. The lithium zirconate -coated powder could even reach 90.66%, which is higher than the sample before modification. The coated material was also more stable at higher potential than pristine material.
When the cathode materials prepared by the Wet-ALD method compared to the mechanofusion one, the latter method exists more restrictions. For example, the coating time cannot be too long, and the more considerable amount of feedstocks is required, but the operation is faster and convenient. In contrast, the chemical coating method is flexible in production and capable of ensuring a complete surface coating, though it needs a more extended operation.
Keywords: Nickel-rich layered material, cathode material, surface modification, mechanical coating, wet atomic layer deposition coating method, artificial solid electrolyte interface, interface stability

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