Journal
JOURNAL OF POWER SOURCES
Volume 378, Issue -, Pages 66-72Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.12.033
Keywords
Potassium-ion batteries; Anode; Expanded graphite; Ex-situ XRD; Low-cost
Funding
- Independent Innovation Foundation of Shandong University
- Young Scholars Program of Shandong University [2016WLJH03]
- Shandong Provincial Natural Science Foundation, China [ZR2017MB001]
- 1000 Talent Plan program [31270086963030]
- Sate Key Program of National Natural Science of China [61633015]
- National Natural Science Foundation of China [21371108]
- Project of the Taishan Scholar [ts201511004]
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Design and synthesis of capable anode materials that can store the large size K+ is the key of development for potassium-ion batteries. The low-cost and commercial expanded graphite with large particles is a graphite-derived material with good conductivity and enlarged interlayer spaces to boost the potassium ion diffusion coefficient during charge/discharge process. Thus, we achieve excellent anode performance for potassium-ion batteries based on an expanded graphite. It can deliver a capacity of 263 mAh g(-1) at the rate of 10 mA g(-1) and the reversible capacity remains almost unchanged after 500 cycles at a high rate of 200 mA g(-1) with a coulombic efficiency of around 100%. The potassium storage mechanism is investigated by the ex situ XRD technique. This excellent potassium storage performance will make the expanded graphite promising anode candidate for potassium ion batteries.
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