Journal
JOURNAL OF POWER SOURCES
Volume 433, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.226697
Keywords
Potassium-ion batteries; Solid polymer electrolyte; Ni3S2 electrode; Binder-free; All-solid-state
Funding
- Shandong Provincial Natural Science Foundation (China) [ZR2017MB001]
- Independent Innovation Foundation of Shandong University
- Young Scholars Program of Shandong University [2016WLJH03]
- State Key Program of National Natural Science of China [61633015]
- 1000 Talent Plan program [31370086963030]
- National Natural Science Foundation of China [21371108]
- Project of the Taishan Scholar [ts201511004]
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Potassium ion batteries attract great attentions on account of their inherent advantages, such as high working voltage, low cost and abundant resources. However, safety issues and low energy density hinder their practical application. Herein, we successfully demonstrate a highly safe all-solid-state potassium-ion battery with a poly (ethylene oxide)-bis(flourosulfonyl)imide potassium based solid polymer electrolyte and a binder-free, three-dimensional, array-structured Ni3S2 electrode. It is found that the PEO-based SPE can not only address the safety issues but also enhance the cycling performance of the Ni3S2 by restricting the diffusion of polysulfides. The all solid-state Ni3S2-K batteries show a high reversible capacity and a good cycling performance at 55 degrees C. Moreover, the Ni3S2 electrode could be used not only as the cathode for potassium batteries with potassium metal as anode but also the anode for potassium-ion batteries.
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