本研究擬開發一新穎安全添加劑，其包含一精準活化溫度為120 ℃之封閉型多元異氰酸酯(B3)以及藉由對苯二胺(PDA)與雙馬來醯亞胺(BMI)進行邁克爾加成反應產生之衍生物(BA2)，分析分為兩個部份，第一部份利用差示掃描量熱法(DSC)以非恆溫模式探討BMI/PDA與BA2/B3的反應特徵溫度及放熱量，以了解其反應動力學和機制，並利用自由模型法和最適化模型法進行反應動力學分析獲得動力學參數，包括活化能(E)、頻率因子(A)、微分模型[f(α)]，此外，透過獲得的動力學參數重建實驗數據來驗證其可信度。
第二部份則將不同比例的高分子BA2-B3作為正極添加劑加入鋰離子電池中，透過循環伏安法(CV)、常/高溫充放電(Charge/Discharge test)、循環壽命(Cycling test)與倍率性能(C-rate)等測試來初步分析其電化學性質，並且與參考商用安全性添加劑製備而成的Benchmark進行比較。此外，使用熱重分析(TGA)以及掃描式電子顯微鏡(SEM)分析添加劑的熱穩定性與電極性質。
研究結果顯示，BA2-B3添加劑相比於Benchmark熱裂解溫度比較低，加入電池後，BA2-B3添加劑在1 %的添加量下表現出與Blank NCM811近似的常溫循環性能，並且優於1 % Benchmark添加劑，最後，從SEM分析可得出BA2-B3添加劑與Blank NCM811的表面型態不同，並且在循環過程中能使材料保持更完整的結構與表面型態，整體而言，BA2-B3添加劑能提高鋰離子電池之安全性並且不過度影響電池性能表現，具有作為正極材料安全性添加劑可行性。

This study aimed to develop a novel additive, which comprises a blocked isocyanate (B3) with the precise activation temperature at 120 °C and a BMI derivative prepared by the Michael addition reaction of BMI with p-Phenylenediamine (PDA). This study was divided into two parts. The first part was from the kinetic perspective to use the non-isothermal method to characterize the reaction temperature and reaction heat of the BMI/PDA and BA2/B3 systems by using differential scanning calorimetry (DSC). The reaction kinetics and activation energy were then determined by model free method and model fitting method. In addition, the reliability of the experimental data was verified by reconstructing model from the obtained kinetic parameters.
The second part, additives with different BA2-B3 loadings were added to positive electrode of the lithium-ion batteries. The electrochemical properties of cells were then characterized by cyclic voltammetry analysis (CV), charge/discharge test and cycling test. These results were also compared with the Benchmark, a commercially available polymer additive, and the Blank (without any additive inside). In addition, the thermal stability and electrode properties of the additives were characterized by thermogravimetric analysis (TGA) and scanning electron microscopy (SEM).
The results showed that the BA2-B3 additive had lower thermal stability as compared to the Benchmark. After cycling at room temperature, the cell with 1 wt% BA2-B3 additive showed better cycling performance than 1 wt% Benchmark, while it exhibited a comparable cycling performance with the Blank. Finally, SEM images illustrated that the BA2-B3 additive had a different surface morphology from that of the Blank NCM811 active material pellets, and BA2-B3 could maintain a more stable structure and surface morphology of the cathode active materials during cycling. BA2-B3 may represent a promising safety additive candidate for lithium-ion battery.

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