本研究論文主要探討高分子添加劑應用於鋰硫電池(Lithium-sulfur battery, LSB)中抑制其多硫離子穿梭效應(Polysulfide shuttle effect)。
研究細項分為三部分，第一部分為活性物質有無經過宿主化處理(Housing treatment)，研究結果顯示經過宿主化處理的活性物質有較佳的電容量表現；第二部分為高分子添加劑之鑑定與分析，透過取代反應將電池材料中常用的聚偏氟乙烯(Poly(vinylidene fluoride), PVDF)部分官能基取代為含氮基團(Nitrogen group)或含氧基團(Oxygen group)，並於分析結果中確認了反應置換性與其電性特徵的改變。第三部分為將高分子添加劑使用於鋰硫電池中使用，實驗結果顯示，在少量添加的條件下即可使電池之電容維持率提升，本研究透過X光光電子能譜(X-ray photoelectron spectroscopy, XPS)確認了碳硫複合活物與高分子添加劑之間的鍵結關係，也透過電化學交流電阻抗頻譜(Electrochemical impedance spectroscopy, EIS)分析得多硫離子濃差分佈(Polysulfide concentration profile)與鋰離子在活物表面電荷轉移(Interface charge transfer)的關係，實驗最後以傳統陰極材料鋰化鎳錳鈷氧化物(Lithium nickel manganese cobalt oxide)並搭配此高分子添加劑驗證其效能。

In this study, We investigate the amine modified poly(vinylidene fluoride) (N-PVDF) as functional additive for suppressing of polysulfide ion shuttling effect in lithium-sulfur batteries. We divide this research into three parts. Part 1. Active materials synthesis and characteristics: The active materials which prepared by two different method, directly mixing or melt-diffusion. Part 2. Amine modified PVDF synthesis and characteristics: The experiment method, functional group analysis, electric property, structure and morphology were discussed in this section. Part 3. PVDF-N as functional additive for lithium-sulfur batteries: The device performance, physical mechanism study and electrochemical analysis were performed to discuss the phenomenon inside the battery operation condition.
We also applied this material to classic lithium ion battery which consist of NMC532 as cathode material. The results also showed that the electric property from PVDF-N can also improve the overcharged stability of NMC532 based half cell.

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