Improved cycle stability and high security of Li-B alloy anode for lithium–sulfur battery
2014
Zhang, Xiaolin | Wang, Weikun | Wang, Anbang | Huang, Yaqin | Yuan, Keguo | Yu, Zhongbao | Qiu, Jingyi | Yang Yusheng,
Lithium–sulfur (Li–S) batteries suffer from low capacity retention rate and high security risks, in large part because of the use of metallic lithium as anode. Here, by employing a Li-B alloy anode, we were able to enhance cycle performance and security of Li–S batteries. Li-B alloy has a unique structure with abundant free Li embedded in stable Li₇B₆ loofah sponge-like framework. The Li₇B₆ constituent functions in the following three aspects: (1) eliminates orientational crystallization of free lithium; (2) reduces effective current density and promotes the formation of SEI layers; and (3) protects alloy bulk materials from deformation, volume expansion or collapse when cycling.
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