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Self-supporting sulfur cathodes enabled by two-dimensional carbon yolk-shell nanosheets for high-energy-density lithium-sulfur batteries

2017; Nature Portfolio; Volume: 8; Issue: 1 Linguagem: Inglês

10.1038/s41467-017-00575-8

2041-1723

Fei Pei, Lele Lin, Daohui Ou, Zongmin Zheng, Shiguang Mo, Xiaoliang Fang, Nanfeng Zheng,

Advanced battery technologies research

How to exert the energy density advantage is a key link in the development of lithium-sulfur batteries. Therefore, the performance degradation of high-sulfur-loading cathodes becomes an urgent problem to be solved at present. In addition, the volumetric capacities of high-sulfur-loading cathodes are still at a low level compared with their areal capacities. Aiming at these issues, two-dimensional carbon yolk-shell nanosheet is developed herein to construct a novel self-supporting sulfur cathode. The cathode with high-sulfur loading of 5 mg cm-2 and sulfur content of 73 wt% not only delivers an excellent rate performance and cycling stability, but also provides a favorable balance between the areal (5.7 mAh cm-2) and volumetric (1330 mAh cm-3) capacities. Remarkably, an areal capacity of 11.4 mAh cm-2 can be further achieved by increasing the sulfur loading from 5 to 10 mg cm-2. This work provides a promising direction for high-energy-density lithium-sulfur batteries.One of the challenges facing lithium-sulfur batteries is to develop cathodes with high mass and high volume loading. Here the authors show that two-dimensional carbon yolk-shell nanosheets are promising sulfur host materials, enabling stable battery cells with high energy density.