Reactivation of dead sulfide species in lithium polysulfide flow battery for grid scale energy storage

Yang Jin, Guangmin Zhou, Feifei Shi, Denys Zhuo, Jie Zhao, Kai Liu, Yayuan Liu, Chenxi Zu, Wei Chen, Rufan Zhang, Xuanyi Huang () and Yi Cui ()
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Yang Jin: Stanford University
Guangmin Zhou: Stanford University
Feifei Shi: Stanford University
Denys Zhuo: Stanford University
Jie Zhao: Stanford University
Kai Liu: Stanford University
Yayuan Liu: Stanford University
Chenxi Zu: Stanford University
Wei Chen: Stanford University
Rufan Zhang: Stanford University
Xuanyi Huang: Stanford University
Yi Cui: Stanford University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Lithium polysulfide batteries possess several favorable attributes including low cost and high energy density for grid energy storage. However, the precipitation of insoluble and irreversible sulfide species on the surface of carbon and lithium (called “dead” sulfide species) leads to continuous capacity degradation in high mass loading cells, which represents a great challenge. To address this problem, herein we propose a strategy to reactivate dead sulfide species by reacting them with sulfur powder with stirring and heating (70 °C) to recover the cell capacity, and further demonstrate a flow battery system based on the reactivation approach. As a result, ultrahigh mass loading (0.125 g cm–3, 2 g sulfur in a single cell), high volumetric energy density (135 Wh L–1), good cycle life, and high single-cell capacity are achieved. The high volumetric energy density indicates its promising application for future grid energy storage.

Date: 2017
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DOI: 10.1038/s41467-017-00537-0

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