鋰離子電池泛用於生活中，如高科技產品的儲能裝置，與動力車中。因此如何提升鋰離子電池安全性，一直都是大家關注的議題。由於充放電過程中，最不穩定的材料為正極，所以直接添加於正極的正極添加劑，逐漸受到學界與業界重視。正極添加劑加入於電池中，經過充放電程序後，會於正極材料表面覆蓋一層固液電解質界面(Solid electrolyte interface, SEI)，此SEI層能夠隔絕正極材料與電解液接觸，或短路時與負極材料之接觸，進而提升電池的安全性。本研究是合成一種新型高分歧型寡聚物作為鋰離子電池中的安全性添加劑・藉由聚矽氧烷(APTES-PhSLX)的加入，可使整體高分歧型寡聚物的活化能上升，進而增加其熱穩定性。由研究結果指出，此新型高分歧型寡聚物添加入高電壓型過量鋰系層狀正極材料中，可以增加其安全性與電池性能。電化學實驗結果也指出，鋰離子擴散能力也大幅提升。

Lithium ion betteryhave been generally used in our live, i.e digital cameras, laptop and electric vehicles. Research and development has focused on improving the performance of existing battery systems, and safety. When lithium batteries charge/discharge , cathode is unstable .Recently, additives for cathode material in lithium ion battery.After an electrochemical process, these additives form the Solid Electolyte Interface (SEI) layer on the surface of cathode material, which can isolate cathode material to prevent contact of electroly and anode as well asenhance the safety in lithium ion batteries.In the study, bismaleimide (BMI), barbituric acid(BTA) and phenylsiloxane oligomer were used to synthesize BMI/BTA/APTES-PhSLX as an additive by Michael addition reaction and free radical reaction. The BMI/BTA/APTES-PhSLX as additive into Li1.2Ni0.2Mn0.6O2 material to investigate theeffect of performance and thermal stability on battery.According to charge/discharge and cycling tests,half-cell which added 130(phslx) increased the capacity and cycling performance. In the thermal exothermic,the 130(phslx) heat toapproximately 18.1% in room temperature.therefore, the cell would enhance the thermal stability when it operated after 40℃ all day.Finally, in cyclic voltammetry, the 130(phslx)’s cell has better diffusion of lithium ion.

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