內部並聯混成式電容器是在電極材料層面上混成兩種材料，一為鋰離子電池材料，另一為電容器材料，藉由控制電流密度大小，使其發揮電池的高能量或是電容器的高功率之特色。本研究中，我們使用兩性材料鋰釩磷酸化合物混成活性碳同時用於正負極，組裝成IPH電容器；另外，將正極材料改為鈷酸鋰混成活性碳與鋰釩磷酸化合物混成活性碳的負極組裝成IPH電容器，進行電化學性質量測。
兩性材料Li3V2(PO4)3 LVP利用溶膠法合成，並透過X光繞射得知其晶體結構為JCPDS 04-016-1666。使用恆電流充放電量測不同電位窗口下的單電極電化學特性，用於電容器的比電容值理論計算。
電容器組裝前負極LVP+AC都經過預鋰化步驟，在電流密度0.1Ag-1下，預鋰化至最低電位0.1V。實驗中使用四種LVP+AC/ LVP+AC重量比例(1/1、2/1、3/1、4/1)作為比較，並得知重量比例為1/1、電位窗口4.0 V，放電電流密度為0.03 Ag-1時，可得到最大能量密度68.4 Whkg-1，比電容值為38.2 Fg-1。
LCO+AC/LVP+AC(1/1)電容器，在電位窗口3.5 V的最高比能量 36.8 Whkg-1 (0.02Ag-1)，比電容值為29.5 Fg-1，最高比功率4.2 kW kg-1 (3Ag-1)。當電位窗口擴大到4.0V時，最高比能量70.3 Whkg-1 (0.02Ag-1)，比電容值為34.3 Fg-1，最高比功率5.2 kWkg-1 (3Ag-1)。

The internal parallel hybrid capacitors assemble with the bi-material electrodes which contain both electrochemical capacitor material and battery materials. In this study, we conduct many electrochemical property measurements on internal parallel hybrid capacitors.
We use sol-gel method to synthesis the amphoteric material, Li3V2(PO4)3. The phase of Li3V2(PO4)3 is analyzed with X-ray diffraction, and the structure is correspond to JCPDS 04-016-1666.
As the negative electrode, Li3V2(PO4)3 hybrid with activated carbon must be prelithiated before its assembly. We use the end potential of prelithiation process 0.1V vs. Li/Li+ at 0.1Ag-1. Then, we compare the charge/discharge performance of four cells with the LVP+AC/LVP+AC mass ratio, 1:1, 2:1, 3:1, 4:1. The maximum specific energy of the LVP+AC/LVP+AC capacitor is measured with a mass ratio of 1:1 for positive and negative electrodes. At the specific current 0.03 Ag-1, the LVP+AC/LVP+AC capacitor demonstrates 68.4 Whkg-1 in the 4.0 window, and the specific capacitance demonstrates 38.2 Fg-1.
The other side, we change the positive electrode and assemble LCO+AC/LVP+AC capacitor with 1:1 mass ratio. At the specific current 0.02 Ag-1, the LCO+AC/LVP+AC capacitor demonstrates 36.8 Whkg-1 in the 3.5 window, and the specific capacitance demonstrates 29.5 Fg-1. When the window increases to 4.0V, the specific energy increases to 70.3 Whkg-1, and the specific capacitance demonstrates 34.3 Fg-1.

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