矽在室溫中擁有3579 mAh/g的理論電容量，適合作為高功率的鋰離子電池材料，然而矽高達300%的高體積膨脹率，造成矽顆粒破碎，使得其電量逐漸下降，成為矽於高功率鋰離子電池材料應用的最大障礙。因此，本研究依照文獻以聚(N-乙烯甲醯胺) (poly(N-vinylformamide), PNVF)、聚丙烯酸(poly(acrylic acid)，PAA)作為研究基礎，將NVF和AA共聚合成為poly(N-vinylformamide-co-acrylic acid)，並分別探討其應用於半電池和全電池組合的矽負極上。通常PNVF50-co-PAA50 (AA50)、矽和導電碳混合後的稠度比PNVF還稠密。不過，我們發現改變其中一個合成步驟可以改善高分子在漿料的分散狀況，得到在2100 mA/g的循環壽命測試下的電量保存率為32.6%，相較於PNVF@DIW (去離子水) 的17%高出約15%，且由電化學阻抗頻譜(EIS)的測量，可以發現AA50在固態電解質界面層(SEI) 阻抗比PNVF還小，彰顯AA50對於SEI層的形成穩定度有所幫助。
為了確認AA50系統應用於鋰離子全電池的成效，本研究也將AA50應用在負極，並組成全電池以進行測試，進行不同充放電速率下的充放電測試和循環壽命測試。以PNVF的全電池做為比較的基礎，在 1 C的電量下，它比PNVF系統高出約40 mAh/g的電容量；且不論在0.2、0.3、0.5 C的循環壽命測試下，它都得到比PNVF高10~30 mAh/g電量的結果。這些結果都顯示AA50在充放電過程中，可以提高對於矽膨脹的支撐力，阻抗比較小，所以電量比較高，而且AA50是水性黏著劑，對於環境更環保也很便宜。簡而言之，AA50具有作為矽黏著劑的高潛力。

Silicon based materials are generally regarded as promising anode materials for lithium-ion batteries owing to their much larger specific capacity, e.g. 3579 mAh/g for pristine silicon. However, cracks and pulverization on silicon anodes prevent their practical applications and must be resolved during charging and discharging. In order to extend the life of Si anode and to avoid cracking, novel binders are promptly synthesized and added to anode. For instance, poly(acrylic acid) (PAA) is one common binder used in Si anode lately, while poly(N-vinyl formamide) (PNVF) is the other type of water-soluble binders suitable for silicon anode. In this study, a new class of copolymers of AA and NVF (PNVF-co-PAA) is synthesized by copolymerization and investigated for its application in lithium-ion battery. For example, the capacity of anode with PNVF-co-PAA as a binder turns out to be 777 mAh/g, an increase to 119% of that of anode with PNVF. In addition, the SEI resistance is much lower in comparison with that of anode with PNVF, revealing a more stable SEI layer of anode with the use of PNVF-co-PAA copolymer as a binder. The electrochemical improvement is largely resulted from the better dispersion of the copolymer in slurry for electrodes. Briefly, a portion of PNVF-co-PAA copolymer is hydrolyzed so that the slurry becomes thicker, because of the enhancement in interaction between water and copolymers, which make the slurry more homogenous as well. From the results of full-cell tests, the capacity of anode with PNVF-co-PAA copolymer increases significantly by 10~40 mAh/g compared to that with PNVF in anode. The copolymer is a water-soluble and eco-friendly binder for Si anode. However, its molecular weight have to be fixed so that the cycle life would be more stable.

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