本實驗將聚偏二氟乙烯(PVDF)和甲基丙烯酸縮水甘油脂(GMA)以原子轉移自由基聚合法合成接枝高分子(PgPGMA)，接著以牛磺酸鋰將其磺酸化，得到最後產物SPgPGMA。本研究以核磁共振光譜和傅立葉轉換紅外線光譜證實成功合成出SPgPGMA，並將SPgPGMA以及其混摻聚丙烯腈(PAN)之混摻物作為黏著劑應用於鋰電池磷酸鋰鐵正極。從SEM圖可以觀察到磷酸鋰鐵正極使用其混摻物作為黏著劑，由於磺酸根基團和氰基基團所帶的負電性，使得分子間產生相互作用力，以及氰基基團的高極性，因此能具有較強的附著力和較好的分散性。本實驗藉由循環伏安法、充放電測試、電化學阻抗以及長效效能對SPgPGMA以及其混摻物之鋰電池進行電化學測試，並與PVDF鋰電池進行比較，從結果可以發現磺酸根基團顯著提升其離子傳導能力，因此使SPgPGMA及其混摻物之鋰電池具有較少的極化現象和較低的介面阻抗等特色。經由充放電測試，SPgPGMA以及其混摻物之鋰電池都較PVDF擁有較好的放電電容量，尤其是SPg3.6PGMA混摻PAN系統之鋰電池在10C放電速率擁有108mAhg-1放電電容量，且仍保有最穩定的電容保持率(10C/0.1C=72%)，此外，本實驗所使用的黏著劑鋰電池，經由200圈充放電後，都保有高於95%的庫侖效率。

A novel graft copolymer consisting of poly(vinylidene fluoride)(PVDF) backbone and poly(glycidyl methacrylate) side chains, that is, PgPGMA, was synthesized by atom transfer radical polymerization(ATRP). Then PgPGMA was sulfonated by Lithium 2-aminoethanesulfonate, followed by the product SPgPGMA. Successful synthesis of the polymer was confirmed by 1H NMR and FT-IR. SPgPGMA and its blending, which is mixed with polyacrylonitrile(PAN) were prepared as binders for LiFePO4 cathode of lithium batteries. The cathodes with the blending exhibit strong adhesion and well dispersion properties observed by SEM, due to the interaction force among the negative charge of the sulfonic acid group and the polarity of the nitrile group. The electrochemical performances were evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, charge-discharge cycle test, cycle life, and compared with the cathode prepared with PVDF binder. Since sulfonic acid group enhances the ionic conductivity and Li+ diffusion, the cathodes with SPgPGMA and its blending feature low polarization, less interfacial resistance and good activity for electrochemical reaction. The cathodes with SPgPGMA and its blending display better discharge capacity than with PVDF, especially for the cathode with SPgPGMA blending PAN shows the highest capacity at 10C (=108 mAhg-1) and maintains the most stable capacity retention (10C/0.1C=72%). In addition, all the binders used for LiFePO4 cathode in this research, have stable coulombic efficiency (>95%) in cycle life after 200 cycles.

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