二磷化矽做為電池陽極具有相當高的理論電量，於鋰電池與鈉電池分別可達到2902 mA h g-1及1788 mA h g-1, 但是在前面的研究中卻呈現出較差的循環表現。在此研究中，藉由將多壁奈米碳管纏繞於二磷化矽表面可有效提升其做為鋰、鈉電池陽極的穩定度。在此結構中，奈米碳管可有效改善二磷化矽導電性以及強化材料結構，使其不易在鋰、鈉離子進入過程中破裂而導致電容量顯著下降。在本研究中，我們利用高能量球磨將多壁奈米碳管(MWCNT)纏繞在二磷化矽(SiP2)表面。MWCNT-wrapped SiP2在鋰離子電池中，以0.5A g-1電流密度充放電循環一百圈之後，電容量仍有1622 mA h g-1 (第五圈的93%)；在鈉離子電池中，以0.2A g-1的電流密度經過200圈的充放電循環後，電容量保持在925 mA h g-1 (第五圈的132%)。此外；在較高的電流密度的充放能力也顯著的提升，在4A g-1的電流密度下，鋰電池的電容量有1149 mA h g-1提升至1522 mA h g-1；在2Ag-1的電流密度下，鈉電池的電容量由201 mA h g-1提升至491 mA h g-1。在更進一步的應用下我們以MWCNT-wrapped SiP2 做為陽極，LiFePO4和Na2/3Ni1/3Mn2/3O2 分別為鋰電池與鈉電池的陰極組成鈕扣全電池及軟包全電池，並且成功的點亮了超過100顆三種不同顏色的LED燈。

SiP2 has a high specific theoretical capacity of 2902 mA h g-1 as an anode material for lithium ion batteries (LIBs) and 1788 mA h g-1sodium-ion batteries (SIBs), respectively, but demonstrated very poor cycling ability in the previous studies. Here, we report high performance SiP2 LIB and SIB anodes with good cycling by wrapping SiP2 with multi-wall carbon nanotube (MWCNT) on the surface of SiP2 via high energy ball milling. MWCNT provides a robust network to connect fragment SiP2 with surrounding electrical conductor and serve as an effective conductive agent. MWCNT-wrapped SiP2 shows high retention 93% (1622 mA h g-1 after 100 cycles) in lithium ion batteries (LIBs) at current density 0.5A g-1 and 132% (925 mA h g-1 after 200 cycles in sodium-ion batteries (SIBs) at current density 0.2A g-1 respectively). In addition, rate-capability of active material also be apparently enhanced during high current density (from 1149 to 1522 mA h g-1 in LIBs with current density 4A g-1 and from 201 to 491 mA h g-1 in SIBs with current density 2A g-1, respectively. Furthermore, to evaluate practical application of MWCNT-wrapped SiP2, coin-type full cell and pouch-type full cell were assembled to successfully light up more than one hundred LEDs with three different colors.

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