本文關(guān)鍵詞： 鋰硫電池 碳納米管 導(dǎo)電紙 集流體 庫倫效率　出處：《復(fù)合材料學(xué)報》2017年04期 　論文類型：期刊論文

【摘要】：為了改善鋰硫電池的循環(huán)性能,以紙纖維為基體,多壁碳納米管(MWCNTs)為導(dǎo)電劑,采用真空抽濾法制得MWCNTs導(dǎo)電紙,并將MWCNTs導(dǎo)電紙作為正極集流體代替鋁箔應(yīng)用于鋰硫電池。對MWCNTs導(dǎo)電紙進(jìn)行了形貌結(jié)構(gòu)表征和電化學(xué)性能測試,并對循環(huán)后的MWCNTs導(dǎo)電紙電極進(jìn)行EDS檢測。結(jié)果顯示,MWCNTs均勻地附著在紙纖維基體上,多空隙的MWCNTs導(dǎo)電紙三維結(jié)構(gòu)明顯。采用MWCNTs導(dǎo)電紙作集流體的鋰硫電池在0.05C和1C倍率充放電下循環(huán)30次,比容量分別保持615mAh/g、496mAh/g,庫倫效率達(dá)97.5%以上,且電荷轉(zhuǎn)移電阻在循環(huán)后降低。EDS元素分析結(jié)果證實MWCNTs導(dǎo)電紙對多硫化鋰有吸附作用,從而一定程度抑制了鋰硫電池的穿梭效應(yīng)。因此,以MWCNTs導(dǎo)電紙作為集流體能有效增加活性物質(zhì)硫的負(fù)載量和接觸面積,使鋰硫電池具有良好的循環(huán)穩(wěn)定性和庫倫效率性能。
[Abstract]:In order to improve the cycle performance of lithium-sulfur batteries, MWCNTs conductive paper was prepared by vacuum filtration with paper fiber as matrix and MWCNTs as conductive agent. MWCNTs conductive paper was used as positive collector instead of aluminum foil in lithium-sulfur battery. The morphology and structure of MWCNTs conductive paper were characterized and electrochemical properties were tested. The MWCNTs conductive paper electrode was detected by EDS. The results showed that the MWCNTs was uniformly attached to the paper fiber matrix. The three-dimensional structure of MWCNTs conductive paper with multiple voids was obvious. The lithium-sulfur battery with MWCNTs conductive paper as the collector fluid was recirculated 30 times at the charge / discharge rate of 0.05 C and 1 C. The specific capacity maintained 615mAh/ g and 496mAh.grespectively, and the Coulomb efficiency was more than 97.5%. The results of EDS elemental analysis show that MWCNTs conductive paper can adsorb lithium polysulfide, which inhibits the shuttle effect of lithium-sulfur battery to some extent. MWCNTs conductive paper can effectively increase the loading amount and contact area of active sulfur and make the lithium-sulfur battery have good cycling stability and Coulomb efficiency.
【作者單位】： 南昌大學(xué)機(jī)電工程學(xué)院;
【基金】：江西省研究生創(chuàng)新專項資金(YC2015-S012)
【分類號】：TS761.2;TM912

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