期刊
ACS NANO
卷 13, 期 3, 页码 3404-3412出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b09296
关键词
lithium-sulfur batteries; MXene; shuttle effect; volumetric capacity; areal capacity
类别
资金
- National Natural Science Foundation of China [21600191, 21673241, 21471151, 51572197]
- Natural Science Foundation of Fujian Province [2018J01030]
- Natural Science Foundation of Zhejiang Province for Distinguished Young Scholars [LR18E020001]
- State Key Laboratory of Structural Chemistry [20170035]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
The areal and volumetric capacities are important metrics in practical deployment of advanced energy storage systems with the imposed constraints of device volume and chip area. Conductive carbons are promising sulfur host materials for improving areal capacity in lithium-sulfur (Li-S) batteries, but they face a few congenital deficiencies, such as low tap density and weak polysulfide entrapment ability, resulting in poor volumetric performance. Here, we report one type of cathode system based on flower-like porous Ti3C2Tx (FLPT) without the incorporation of any carbon hosts or conductive additives. The resultant FLPT-S electrode synchronously acquires a high areal capacity of 10.04 mAh cm(-2) and ultrahigh volumetric capacity of 2009 mAh cm(-3). Furthermore, ex situ electron paramagnetic resonance and UV-visible spectra have demonstrated that FLPT enables a fast dynamic equilibrium between S-6(2-) anion and S-3(center dot-) radica during cycling, which promotes the redox reactions of sulfur species.
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