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METHOD OF IMPROVING THE CHARGE/DISCHARGE CYCLE LIFE AND SAFETY OF AN ALKALI METAL-SULFUR SECONDARY BATTERY
METHOD OF IMPROVING THE CHARGE/DISCHARGE CYCLE LIFE AND SAFETY OF AN ALKALI METAL-SULFUR SECONDARY BATTERY
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机译:改善碱金属硫二次电池充放电循环寿命和安全性的方法
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摘要
Provided is a method of improving a cycle-life of a rechargeable alkali metal-sulfur cell, the method comprising implementing an electronically non-conducting anode-protecting layer between an anode active material layer and a cathode active material without using a porous separator in the cell, wherein the anode-protecting layer has a thickness from 1 nm to 100 μm and comprises an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000%, a lithium ion or sodium ion conductivity from 10−8 S/cm to 5×10−2 S/cm, and an electronic conductivity less than 10−4 S/cm when measured at room temperature. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, no known dendrite issue, no dead lithium or dead sodium issue, and a long cycle life.
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机译:提供了一种改善可再充电碱金属-硫电池的循环寿命的方法,该方法包括在阳极活性材料层和阴极活性材料之间实施不导电的阳极保护层而不在其中使用多孔隔板。电池,其中所述阳极保护层的厚度为1nm至100μm,并且包含弹性体,所述弹性体的可完全恢复的拉伸弹性应变为2%至1,000%,锂离子或钠离子的电导率为10Sup-8 < / Sup> S / cm到5×10 -2 Sup> S / cm,在室温下测量的电子电导率小于10 -4 Sup> S / cm。该电池具有高硫含量,高硫利用效率,高能量密度,无已知枝晶问题,无锂或钠钠问题以及长循环寿命的出色组合。
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