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首页> 外文期刊>Journal of power sources >A high energy density lithium/sulfur-oxygen hybrid battery
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A high energy density lithium/sulfur-oxygen hybrid battery

机译：高能量密度锂/硫氧混合动力电池

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In this paper we introduce a lithium/sulfur-oxygen (Li/S-O_2) hybrid cell that is able to operate either in an air or in an environment without air. In the cell, the cathode is a sulfur-carbon composite electrode containing appropriate amount of sulfur. In the air, the cathode first functions as an air electrode that catalyzes the reduction of oxygen into lithium peroxide (Li_2O_2). Upon the end of oxygen reduction, sulfur starts to discharge like a normal Li/S cell. In the absence of oxygen or air, sulfur alone serves as the active cathode material. That is, sulfur is first reduced to form a soluble polysulfide (Li_2S_x, x≥4) that subsequently discharges into Li_2S through a series of disproportionations and reductions. In general, the U/S-O_2 hybrid cell presents two distinct discharge voltage plateaus, i.e., one at ～2.7V attributing to the reduction of oxygen and the other one at ～2.3 V attributing to the reduction of sulfur. Since the final discharge products of oxygen and sulfur are insoluble in the organic electrolyte, it is shown that the overall specific capacity of U/S-O_2 hybrid cell is determined by the carbon composite electrode, and that the specific capacity varies with the discharge current rate and electrode composition. In this work, we show that a composite electrode composed by weight of 70% M-30 activated carbon, 22% sulfur and 8% polytetrafluoroethylene (PTFE) has a specific capacity of 857mAh g~(-1) vs. M-30 activated carbon at 0.2 mA cm~(-2) in comparison with 65GmAh g~(-1) of the control electrode consisting of 92% M-30 and 8% PTFE. In addition, the self-discharge of the Li/S-O_2 hybrid cell is expected to be substantially lower when compared with the Li/S cell since oxygen can easily oxidize the soluble polysulfide into insoluble sulfur.
机译：在本文中，我们介绍了一种锂/硫氧（Li / S-O_2）混合电池，该电池能够在空气中或没有空气的环境中工作。在电池中，阴极是含有适量硫的硫碳复合电极。在空气中，阴极首先充当空气电极，该空气电极催化氧气还原成过氧化锂（Li_2O_2）。氧还原结束后，硫开始像普通的Li / S电池一样放电。在没有氧气或空气的情况下，硫单独用作活性阴极材料。即，首先将硫还原形成可溶的多硫化物（Li_2S_x，x≥4），然后通过一系列歧化和还原反应将其排放到Li_2S中。通常，U / S-O_2混合电池呈现两个不同的放电电压平稳期，即一个在〜2.7V时有助于减少氧气，另一个在〜2.3 V时有助于减少硫。由于氧和硫的最终放电产物不溶于有机电解质，因此表明，U / S-O_2混合电池的总比容量由碳复合电极决定，并且比容量随放电电流而变化。速度和电极组成。在这项工作中，我们表明，由70％的M-30活性炭，22％的硫和8％的聚四氟乙烯（PTFE）组成的复合电极与M-30活性炭相比具有857mAh g〜（-1）的比容量。相较于由92％M-30和8％PTFE组成的控制电极的65GmAh g〜（-1）而言，碳在0.2 mA cm〜（-2）处的碳含量更高。另外，与氧/锂电池相比，锂/硫-氧_2混合电池的自放电预计会大大降低，因为氧气可以将可溶的多硫化物容易地氧化成不溶的硫。

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