本論文之研究目的，為利用疏水性膠囊化的方法將LiFePO4 合成於CMK-3之奈米通道內，做為鋰離子電池陰極材料，藉CMK-3幫助LiFePO4在充放電過程中有較佳之電子傳導路徑，以彌補其電子導電性不佳之缺點。另一方面，將LiFePO4合成於限制空間中，期能將其均勻分散，以縮短鋰離子於充放電時嵌入/嵌出時之路徑。
此外，為了提高LiFePO4/ CMK-3複合材料中活性材料之比例，故將製程中所使用之蔗糖溶液濃度降低，期能有效提升介孔碳材之比表面積與孔洞體積，提升LiFePO4之含量，並提升複合材料的重量能量密度。
首先由XRD繞射分析之結果得知，複合材料中之LiFePO4材料皆為橄欖石結構。另一方面，奈米LiFePO4顆粒沉積於介孔內之現象
可由特性峰之半高寬較寬廣得到證實。而從SEM表面形態與SAXS結構分析得知，複合材料之形態仍為長條管狀形態，與CMK-3相似，且隨著碳源添加量減少，發現可將LiFePO4的含量提升至81 wt %，並維持長條管狀之巨觀結構，但內部規則介孔結構崩解形成不規則排列之介孔碳材。而Raman分析發現，碳材經由酸處理後，其石墨化程度並未有顯著差異，故能形成良好之電子傳導路徑，以改善LiFePO4導電度不佳的缺點。
LiFePO4/CMK-3複合陰極材料以鈕扣型電池組裝進行循環充放電性能測試，經過30圈高速充放電後，放電電容量無明顯衰退現象發生，LiFePO4/CMK-3(60%)於2C之高速充放電條件下，三十圈後其衰退率為1.64 % (1st和30th分別為116.2與114.3 mAh/g)。由此可知，將LiFePO4合成於CMK-3奈米通道內，可改善LiFePO4導電度不佳之缺點，使其在高充放電速率下表現出絕佳性能。

The purpose of the study is to synthesize LiFePO4 materials in the nanochannels of CMK-3 by the previously developed hydrophobic encapsulation route for Li ion battery cathodes. By employing the developed route, nano-sized LiFePO4 could be deposited in the confined space of CMK-3, which could compensate the poor electronic conductivity of LiFePO4 with the aid of continuous carbon mesostructure. Further, the synthesized LiFePO4 could be restricted in the confined space as well, resulting in reduction of the particle size. It would help to reduce the path for Li+ ions during intercalation/de-intercalation process. On the other hand, increase of LiFePO4 in LiFePO4/CMK-3 composite materials was examined by reducing the sucrose concentration during the preparation process. It would be helpful for increase of specific energy density of the composite materials.
The crystalline structure of the synthesized composite materials was determined to be Olivine-type structure, indicating the success of LiFePO4 in the composite materials. The observation also shows the broadening of the peaks, exhibiting degrees of LiFePO4 in the confined space. The content of LiFePO4 can be increased up to 81 wt % by reduction of the sucrose concentration during process, but, the carbon nano-rods in the CMK-3 shows no ordering, which may resulted from lowing the sucrose concentration. In addition, the degree of graphitization for all the composite materials shows no difference.
The charge-discharge cycling performances of the LiFePO4/CMK-3 composite materials were demonstrated by using coin cells. After 30 cycles, it was found that no obvious degradation was shown for the specific capacity even cycling at high C-rate (degradation rate of LiFePO4/CMK-3(60%) at 2C is only 1.64 %. The discharge capacity of 1st and 30th cycles are 116.2 and 114.3 mAh/g, respectively), indicating possible application in practice.

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