A strategy of using temporary space-holders to increase the capacity for Li-S batteries

Mingyang, Zhu, Wang, Nannan, Wang, Jun, Zinan, Jiang, Huang, Jiarui and Liu, Xiaoteng (2021) A strategy of using temporary space-holders to increase the capacity for Li-S batteries. Journal of Electroanalytical Chemistry, 882. p. 115008. ISSN 1572-6657

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Abstract

The porous structure within the cathode material influences the capacity and operating performance of Li-S batteries. Here, we prepared special carbon material using sodium chloride as template/temporary space-holders to design mixture of micro-/meso-/macroporous structure with large surface area through a facile water bath and freeze-drying process. Such modification led to a high sulfur content of 73.2 with remarkable initial capacity of 1378 mAh g-1 at 0.1 A g‒1, and maintains 48.6 after 100 cycles. Moreover, the Li-S battery displayed superior rate capability of 807 mAh g–1 at 1.0 A g–1. This abundant micro-/meso-/macropores can improve the content of sulfur, relieve the loss of sulfur and exhibit superior cycling performance and rate capability.

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