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减少高负载Li-S电池的自放电与富含氧气的生物质碳介层的碳介层

Wei Li¹, Yumei Qin¹, Xiaojian Dou¹

¹Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, College of Chemistry and Food Science, Yulin Normal University, Yulin, 537000, PR China.

Chemistry, an Asian journal

|April 19, 2024

概括

研究人员开发了一种富含氧气的碳纳米薄板介层,用于防止硫 (Li-S) 电池中的多硫化物穿. 这种中间层显著减少了自放电,提高了能源效率和容量.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
储能储能储能储能储能储能

背景情况:

硫 (Li-S) 电池具有高的理论能量密度,但由于聚硫化物穿和自放电,其能效较差.
聚硫化物穿效应涉及可溶性聚硫化物在电极之间迁移,导致容量色和自放电.

研究的目的:

开发一种功能性的中间层,可以抑制聚硫化物穿,并减轻Li-S电池中的自放电.
提高Li-S电池的能源效率和电化学性能.

主要方法:

制造一个富含氧气的碳纳米板 (OCN) 介层,来自包.
对聚硫化物OCN中间层的物理阻塞和化学固定能力的表征.
用OCN中间层对Li-S电池进行电化学测试,包括自放电率测量和高质量负载时的特定容量评估.

主要成果:

OCN中间层有效地抑制了通过物理障碍和化学相互作用 (O-S键) 的聚硫化物穿.
在为期七天的测试中,观察到自放电率显著降低了93%.
带有OCN中间层的Li-S电池在7.18毫克的高质量负载下达到710.05mAhg-1的超高排放特异容量.

结论:

来自包的OCN中间层是一种简单而有效的策略,可以抑制聚硫化物穿并减少Li-S电池中的自放电.
这种方法为设计先进的介层来实现高能效Li-S电池打开了新的道路.

关键词:

从包中获得的碳来源于包.硫电池的使用情况聚硫化物转换过程中的多硫化物.聚硫化物捕获的聚硫化物自放电自放电方式

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