A multi-wall carbon nanotube/dithiothreitol interlayer to inhibit the shuttling of lithium polysulfides in a Li-S battery
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摘要:
二硫苏糖醇（DTT）作为剪切剂，对高阶多硫化物进行剪切阻止其溶解，抑制穿梭效应的产生。以二硫苏糖醇（DTT）和多壁碳纳米管（MWCNTs）复合薄膜作为锂硫电池正极片与隔膜之间的阻隔层，抑制多硫化物的溶解和扩散，阻止穿梭效应，减小活性物质的损失，提高锂硫电池的容量和循环性能。利用透射电子显微镜（TEM）和扫描电镜（SEM）等进行结构和性能的表征。电化学测试结果表明，含DTT/MWCNTs阻隔层的锂硫电池在0.2 C倍率首次放电比容量达到1 674 mAh/g，活性物质的利用率达到99.9%。在1 C充放电300次循环后，容量依然保持在780 mAh/g，是首次放电容量1 094 mAh/g的71.3%，且库伦效率保持在95.3%以上。在5 C和10 C倍率下充放电，电池比容量分别达到597和214 mAh/g。
Abstract:An interlayer made of a multi-wall carbon nanotube (MWCNT)/dithiothreitol (DTT) composite was placed between the positive electrode and the separator of a Li-S battery, where DDT was used as the reducing agent of lithium polysulfides, and MWCNTs as the reinforcement and diffusion barrier to inhibit the shuttling of lithium polysulfides. Results indicate that the formation of lithium polysulfides was inhibited and their diffusion to the negative electrode was reduced. The discharge capacity, utilization rate of the active substances, and rate and cycling performance of the Li-S battery were substantially improved. The initial discharge capacity of the battery was 1 674 mAh/g at 0.2 C and the utilization rate of active substances reached 99.9%. The initial discharge capacities were 1 094, 597 and 214 mAh/g at 1, 5 and 10 C, respectively. The discharge capacity was 780 mAh/g at 1 C after 300 cycles, which was 71.3% of its initial capacity.
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