本研究將使用原子層沉積法來改善Si/graphene/CNT複合材料，並應用於鋰離子電池之陽極。經表面修飾之Si奈米粒子可與氧化石墨烯形成均勻分散結構，為簡單、符合成本效益的製備方式。另外，加入奈米碳管以增加電子的傳輸路徑，而為了提升電化學的表現，本文主要探討在Si/graphene/CNT複合材料的極片上沈積不同原子層圈數的Al2O3層，和添加VC對其電化學特性的影響，藉由提供一種人工固體電解質界面，來減少電解液在電極的反應，結果顯示，塗層太厚會導致阻力增加，電容量呈現較低的現象。但只利用ALD表面改質，無法對其循環壽命特性做有效的改善。
為了更進一步提高其循環充放電穩定性，本文，嘗試著加入了2 wt.% VC至電解液中。塗佈20層的Al2O3之複合電極第一圈可逆電容量為1450 mAh/g，到了第50圈電容量仍有第一圈的88 %，與其它層數修飾電極相比，呈現較佳的循環電容量與穩定性，且有較高的庫倫效率。表示結合ALD修飾和VC的方法，可生成較穩定SEI層，進一步提高了電池充放電穩定性。

This study used the atomic layer deposition (ALD) method to improve the Si / graphene / CNT composite anode materials for application in lithium-ion battery. Surface-modified Si nanoparticles can form a uniform dispersive structure with graphene oxide proven as a simple and cost-effective preparation method. In addition, by adding carbon nanotubes, further improvement of the composite was observed. The deposition of different ALD cycles of Al2O3 layers was applied directly on the Si / graphene / CNT composite anode materials. The effect of the addition of 2 wt% vinylene carbonate (VC) with ALD coating was also explored. The results show that only using ALD coating does not improve the electrochemical performance of the composite material. When ALD and VC are simultaneously utilized the cycle stability showed dramatic improvements where increased ALD cycles showed increased stability but lower capacity.
The first cycle reversible capacity of the composite anode coated with 20 layers Al2O3 showed a capacity of 1450 mAh / g after the 50th cycle that is 88% of the first cycle. Furthermore, compared to other ALD cycle variations, 20 ALD cycles showed higher coulombic efficiency. With the results provided in this work, the very mild and simple combination of ALD coating and VC proves to be a superior method in stabilizing the silicon anode containing lithium ion batteries.

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