期刊
ADVANCED MATERIALS
卷 30, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804084
关键词
high sulfur content; lithium ion transport path; lithium-montmorillonite; lithium-sulfur batteries
类别
资金
- National Natural Science Foundation of China [51722204, 51622208]
- National Key Basic Research Program of China [2014CB931702]
- Sichuan Provincial Fund for Distinguished Young Academic and Technology Leaders [2014JQ0011]
- Fundamental Research Funds for the Central Universities [ZYGX2016Z004]
- Sichuan Science and Technology Program [2018RZ0082]
Fast lithium ion transport with a high current density is critical for thick sulfur cathodes, stemming mainly from the difficulties in creating effective lithium ion pathways in high sulfur content electrodes. To develop a high-rate cathode for lithium-sulfur (Li-S) batteries, extenuation of the lithium ion diffusion barrier in thick electrodes is potentially straightforward. Here, a phyllosilicate material with a large interlamellar distance is demonstrated in high-rate cathodes as high sulfur loading. The interlayer space (approximate to 1.396 nm) incorporated into a low lithium ion diffusion barrier (0.155 eV) significantly facilitates lithium ion diffusion within the entire sulfur cathode, and gives rise to remarkable nearly sulfur loading-independent cell performances. When combined with 80% sulfur contents, the electrodes achieve a high capacity of 865 mAh g(-1) at 1 mA cm(-2) and a retention of 345 mAh g(-1) at a high discharging/charging rate of 15 mA cm(-2), with a sulfur loading up to 4 mg. This strategy represents a major advance in high-rate Li-S batteries via the construction of fast ions transfer paths toward real-life applications, and contributes to the research community for the fundamental mechanism study of loading-independent electrode systems.
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