本研究主要目的是想透過低溫(<150℃)水熱法摻雜氮於還原氧化石墨烯(RGO)表面上，氮原子可以增加極性及電子親和性，以及增加石墨的電導度和碳-碳間的活性空缺，接著透過混合攪拌方式加入鐵源，最後在氮氣下進行500℃鍛燒，使其均勻分散於還原氧化石墨烯表面，以提升鋰離子電池快充性能。
首先吾人透過改變乾燥溫度以改良傳統還原氧化石墨烯之赫馬法，將石墨直接合成為還原氧化石墨烯，還原氧化石墨烯在BET量測結果顯示為22.52nm中孔(Mesopore)，比表面積為422.5m2/g，此材料於電池充放條件為4.0C倍率下，具有180mAh/g比電容量，接著將尿素作為摻氮合成的前驅物進而提升倍率性能，而主要原因 amino/amide的氮官能基轉變成pyridinic/pyrrolic氮官能基，由於此官能基上的氮原子在還原氧化石墨烯上並非平面結構，氮原子上的孤對電子易與還原氧化石墨烯 上的π電子形成共振結構，因此共振結構會使電子由單重態傳導到三重態，增加電子的生存時間，藉以提升倍率充電性能，不同摻氮含量之還原氧化石墨烯於4.0C倍率下，具有210mAh/g至350mAh/g比電容量；而最後利用混合鐵源後鍛燒，將0.2NRGO/Fe2O3結構在200圈1.0C倍率充電循環中，可得到良好的比電容量，而比電容量增加隨著圈數增加而增加，可以歸功於鋰離子擴散在循環中激活及穩定、Fe2O3的逐漸活化性質。

This study is that hoped to improve the fast-charging performance of lithium-ion batteries(LIBs) by doped nitrogen on the surface of reduced graphene oxide (RGO) though hydrothermal treatment at low-temperature process(<150℃), and mixing the ferric oxides then calcination at 500℃ for 4 hours in which uniformly dispersion the particles.
First, I used Improved Hemmers’ method directly synthesize graphite to RGO by changing drying temperature. The characteristic result of RGO shows 22.52nm mesopore, and has a high specific surface area of 422.5m2/g, which can withstand high charging rate of 4.0C and keep capacity in 180mAh/g. After the nitrogen source of urea is doped into RGO, the nitrogen functional group of amino/amide is transformed into pyridinic/pyrrolic nitrogen functional group. The atoms on RGO aren’t planar structures, and lone pair of electrons on nitrogen atoms easily form a resonance structure with π electrons on RGO. This resonance structure allows electrons to be conducted from a singlet state to a triplet state, and increase the electron’s survival time. Although this nitrogen doping doesn’t greatly increase the specific capacity, increase the rate capability.
After the parameter is adjusted, 0.2NRGO is the optimal parameter. The 0.2NRGO/Fe2O3 structure has a good rate capability of 1.0C for 100 cycles, and the specific capacity increases with the increase of cycles. This increase tendency may be attributed to the gradual activation of Fe2O3, the synergistic effect of graphene and Fe2O3, as well as the pseudocapacitive and the electron double layer capacitance (EDLC) of oxygen-containing graphene sheets.

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