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[資源]
Bruce最新Li-O2電池Nature chemistry,這個充電平臺好平呀
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The non-aqueous Li–air (O2) battery is receiving intense interest because its theoretical specific energy exceeds that of Li-ion batteries. Recharging the Li–O2 battery depends on oxidizing solid lithium peroxide (Li2O2), which is formed on discharge within the porous cathode. However, transporting charge between Li2O2 particles and the solid electrode surface is at best very difficult and leads to voltage polarization on charging, even at modest rates. This is a significant problem facing the non-aqueous Li–O2 battery. Here we show that incorporation of a redox mediator, tetrathiafulvalene (TTF), enables recharging at rates that are impossible for the cell in the absence of the mediator. On charging, TTF is oxidized to TTF1 at the cathode surface; TTF1 in turn oxidizes the solid Li2O2, which results in the egeneration of TTF. The mediator acts as an electron–hole transfer agent that permits efficient oxidation of solid Li2O2. The cell with the mediator demonstrated 100 charge/discharge cycles. 附注:TTF的維基百科介紹: 四硫富瓦烯(TTF),是富瓦烯的2,2'-位被硫原子替換后形成的化合物。它最早由Wudl在1970年合成,1972年發(fā)現(xiàn)其氯化物鹽具高導(dǎo)電性,次年制得其TCNQ鹽,并發(fā)現(xiàn)該鹽的導(dǎo)電性在室溫以下突然增加,在60K可達(dá)10^4 ohm^(-1) cm^(-1),足以被稱為“有機(jī)金屬”。1979年又進(jìn)一步發(fā)現(xiàn)以四硫富瓦烯為基礎(chǔ)的Bechgaard鹽[TMTSF]2X(X為PF6-,AsF6-)為首個制得的分子超導(dǎo)體,使得人們對這一領(lǐng)域產(chǎn)生極大興趣。 四硫富瓦烯雖然看上去是14π的平面系統(tǒng),但缺乏環(huán)狀共軛,所以不具芳香性。它可被氧化為自由基陽離子及雙陽離子,均是熱力學(xué)穩(wěn)定和具芳香性的物種,氧化反應(yīng)分步且可逆。四硫富瓦烯是強(qiáng)π電子供體,與受體如TCNQ形成的鹽類是分子導(dǎo)體的典型代表,此類鹽具高各向異性的導(dǎo)電性。 http://zh.wikipedia.org/wiki/%E5 ... C%E7%93%A6%E7%83%AF[ Last edited by nihaoczh on 2013-5-13 at 08:06 ] |
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